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M Chabchoub - One of the best experts on this subject based on the ideXlab platform.
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Numerical estimation of the mode I strain energy Release Rate in woven-ply thermoplastic-based composites at high temperature based on Gθ method
Theoretical and Applied Fracture Mechanics, 2019Co-Authors: M Chabchoub, B Vieille, Rostand Moutou PittiAbstract:The present work was aimed at estimating the mode I strain energy Release Rate at crack initiation in woven-ply thermoplastic (TP) based laminates at high temperature T>T g . A linear spectral viscoelastic model and a generalized Norton viscoplastic model were used to account for the time-dependent behavior of TP-based composite laminates, which are exacerbated at high temperature. To precisely evaluate the fracture parameters (e.g. R-curves) in TP composites, a study on the mesh type and its refinement was carried out. Using the finite element code Cast3m, the G θ method was applied in order to test its capability to determine the mode I strain energy Release Rate for different testing conditions. (5)-Harness satin weave carbon fabric reinforced PolyPhenylene Sulfide (5HS C/PPS) laminates have been studied with two different stacking sequences: a Quasi-Isotropic (QI) sequence characterized by a fibre-dominated behaviour and an Angle-Ply (AP) sequence whose behaviour is matrix-dominated. Tensile tests have been simulated on Single-Edge-Notch (SEN) specimens (with different notch lengths) subjected to quasi-static loadings in order to investigate the effect of time-dependent behaviors on translaminar failure and strain energy Release Rate. The R-curves have been derived from the computation of the strain energy Release Rate and the corresponding crack length. Ultimately, it is possible to build R-curves based on the evaluation of fracture toughness for different ratios a/w and to compare these curves to the ones obtained from experiments.
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influence of matrix ductility and toughness on strain energy Release Rate and failure behavior of woven ply reinforced thermoplastic structures at high temperature
Composites Part B-engineering, 2018Co-Authors: B Vieille, M Chabchoub, Christophe GautreletAbstract:Abstract The purpose of the present work is to investigate damage evolution in 5-harness satin weave carbon fabric reinforced PolyPhenylene Sulphide (PPS) structures with an initial edge notch. To understand how the physical properties of the constituents (e.g. matrix toughness and ductility) and the architecture of reinforcement (woven-ply) affect the fracture behavior of C/PPS laminates, it is useful to have analytical representation of the translaminar failure modes based on fracture mechanics concepts, the strain energy Release Rate G especially. Translaminar failure is determined by the combination of loading, location of defect and material heterogeneity (presence of matrix-rich regions at the crimp area in woven-ply laminates). When translaminar failure is initiated from an existing notch, a sequence of energy-absorbing events (fiber breakage, matrix cracking, fibers pull-out, fiber/matrix debonding) occurs in a region surrounding the notch tip. The knowledge of energy-absorbing processes is therefore important since they are responsible for the toughness of the composite. Depending on laminates' stacking sequence, the contribution of matrix behavior to strain energy Release Rate can be evaluated during damage in both brittle and ductile composite laminates subjected to high temperature conditions (T > T g ) when matrix ductility and toughness are enhanced. Depending on the initial notch orientation (0 or 45°), the failure mode is either a mode I or a mixed mode (I + II). The acoustic energy associated with translaminar failure was correlated with the strain energy Release Rate during translaminar failure. The total strain energy Release Rate in quasi-isotropic (QI) laminates is 6 times as low as in angle-ply (AP) laminates, suggesting that large plastic deformation (due to a matrix-driven behavior and an enhanced matrix ductility at T > Tg) are instrumental in dissipating a great portion of the mechanical energy brought to the specimen in AP laminates. The “material” effect is combined with a structural one (rotation of the fibers) at the crack tip, and leads to ductile failure. Both effects contribute to high fracture toughness in AP laminates.
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influence of stress concentration factor on the evolution of the strain energy Release Rate at high temperature in highly ductile carbon fibers reinforced thermoplastic structures
International Conference Design and Modeling of Mechanical Systems, 2017Co-Authors: M Chabchoub, B Vieille, Christophe Gautrelet, Moez Beyaoui, M Taktak, M Haddar, Lakhdar TalebAbstract:This work was aimed at investigating the influence of stress concentration factor on the evolution of the strain energy Release Rate J in 5-harness satin weave carbon fabrics reinforced Polyphenylene sulphide (PPS) structures at 120 °C (higher than the transition temperature Tg). The studied angle-ply (AP) laminates are characterized by a highly ductile behavior. For this purpose, the load separation method, as well as the compliance method, are applied in order to determine the strain energy Release Rate J for different crack length over specimen width ratios a/W. A fractographic analysis was conducted to understand the chronology of damage mechanisms which significantly depends on the enhanced PPS matrix ductility and toughness at T > Tg. An acoustic emission (AE) technique was used to investigate the correlation between the energy Released during translaminar cracking and the cumulative AE energy/events for different stress concentration factors. Fibers breakage appears to be not very energetic from the AE standpoint. Finally, blunting is instrumental in increasing the strain energy Release Rate in specimens with low-stress concentration factors, due to large plastic deformations at the crack tip.
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investigations on crack propagation and strain energy Release Rate in notched woven ply thermoplastic laminates at high temperature
International Journal of Applied Mechanics, 2016Co-Authors: M Chabchoub, B Vieille, Moez Beyaoui, M Taktak, Mohamed Haddar, Lakhdar TalebAbstract:The strain energy Release Rate G is of prime importance in composite materials fracture mechanics. In order to experimentally and numerically evaluate this parameter in the case of quasi-isotropic and angle-ply (AP) woven-ply thermoplastic (TP) laminates, single edge notched (SEN) specimens have been subjected to monotonic tensile loading at T > Tg when the toughness and the viscous behavior of the (TP) matrix are exacerbated. From the simulation standpoint, a particular attention was paid to the type of meshing as well as its refinement in the vicinity of the crack tip where the triaxiality Rate leads to significant stress concentrations. For this purpose, a linear spectral viscoelastic and a generalized Norton-type viscoplastic models have been used. A comparison between two types of meshing (radiant and concentric) has been conducted. Both types of meshing allow us to define crowns in order to represent the surface of the integration ring around the crack tip. These crowns are necessary to evaluate the strain energy Release Rate GI in opening mode using Gθ-integral computation. Both overstress and overstrain profiles near the crack tip were investigated and validated using theoretical stress fields derived from the linear elastic fracture mechanics (LEFM) framework and overstrain fields obtained from digital image correlation (DIC) to verify the model’s ability to provide accuRate mechanical fields at singularity zones.
M V Swain - One of the best experts on this subject based on the ideXlab platform.
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adhesion determination of dental porcelain to zirconia using the schwickerath test strength vs fracture energy approach
Acta Biomaterialia, 2014Co-Authors: P Kosyfaki, M V SwainAbstract:Two approaches to measure the fracture energy to delaminate four different porcelains from zirconia substRates are compared using Schwickerath adhesion strength test specimens. In all instances it was possible to stably extend the crack along or adjacent to the porcelain-zirconia interface. The fracture energy expended to delaminate the porcelain was found by determining the work of fracture upon loading to 12 N and then unloading. Additional tests were undertaken on specimens notched along the interface, which enabled the compliance of the cracked Schwickerath specimens to be calibRated. The strain energy and deflection of the Schwickerath specimen as a function of crack length were derived. On this basis a simple expression was determined for the strain energy Release Rate or interfacial fracture toughness from the minima in the force-displacement curves. Consequently two measures of the adhesion energy were determined, the work of fracture and the strain energy Release Rate. It was found that the ranking for the four porcelains bonded to zirconia differed depending upon the approach. The work of fracture was substantially different from the strain energy Release Rate for three of the porcelain-zirconia systems and appears to be directly related to the residual stresses present in the bonded structures. The relative merits of the strain energy Release Rate, work of fracture vs. the stress to initiate cracking in the case of the Schwickerath adhesion test, are discussed. The advantage of this test is that it enables three estimates of the adhesion for porcelain veneers bonded to zirconia.
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effect of surface treatments on adhesion of low fusing porcelain to titanium as determined by strain energy Release Rate
Dental Materials, 2011Co-Authors: Shaymaa E Elsaka, M V SwainAbstract:Abstract Objective This study evaluated the effect of different chemical surface treatments on the surface characteristics of commercially pure titanium (cp Ti) and the adhesion of the porcelain–titanium system by means of strain energy Release Rate ( G -value, J/m 2 ). Surface roughness and morphology of treated cp Ti were additionally evaluated. Methods Two hundred and thirty specimens of machined cp Ti plates grade II were prepared. The specimens were divided into ten groups in each test according to the surface treatment used; Gr 1 (control; machined), Gr 2 (sandblasted), Gr 3 (CH 2 Cl 2 for 5 min), Gr 4 (CH 2 Cl 2 for 10 min), Gr 5 (10% H 2 O 2 for 5 min), Gr 6 (10% H 2 O 2 for 10 min), Gr 7 (30% H 2 O 2 for 5 min), Gr 8 (30% H 2 O 2 for 10 min), Gr 9 (9% HF for 5 min) and Gr 10 (9% HF for 10 min). Titanium–porcelain (Vita Titankeramik) was applied to each group for testing the adhesion. The G -value (J/m 2 ) was measured with a four-point bending configuration. Following fracture testing specimens were examined with a scanning electron microscope (SEM). Surface roughness and SEM analysis were carried out. Data were analyzed using ANOVA and Tukey's test. Results Groups treated with 9% HF or CH 2 Cl 2 baths for 10 or 5 min showed the highest adhesion values (J/m 2 ) (34.23 ± 4.31, 30.75 ± 4.91, 28.92 ± 4.33 and 22.54 ± 3.58) respectively among the groups. The machined groups demonstRated the lowest value (8.18 ± 1.95) (J/m 2 ). SEM analysis indicated a combination of cohesive and adhesive fractures for 9% HF, CH 2 Cl 2 , sandblasted and 30% H 2 O 2 (10 min) groups, while mainly adhesive fractures were found with the other groups. There was no direct correlation between surface roughness and adhesion. Significance Adhesion between porcelain and cp Ti can be improved by the use of certain chemical surface treatments prior to porcelain firing as alternative techniques to sandblasting treatment.
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influence of chromium interlayer on the adhesion of porcelain to machined titanium as determined by the strain energy Release Rate
Journal of Dentistry, 2010Co-Authors: Shaymaa E Elsaka, Ibrahim M Hamouda, Yehia A Elewady, Ossama B Abouelatta, M V SwainAbstract:Abstract Objectives This study evaluated the effect of a chromium interlayer deposited by electroplating on the adhesion between titanium and porcelain by means of strain energy Release Rate (G-value (J/m2) or interfacial toughness). Methods Seventy rectangular specimens of commercially pure titanium (CP Ti) plates grade II (8 mm × 30 mm × 1.5 mm) were prepared. The specimens were divided into seven groups according to the electroplating treatment; Gr 1 (control without electroplating, n = 10); Gr 2 (5% (w/v) chromium nitRate solution for 30 min, n = 10); Gr 3 (5% (w/v) chromium nitRate solution for 60 min, n = 10); Gr 4 (5% (w/v) chromium nitRate solution for 120 min, n = 10); Gr 5 (10% (w/v) chromium nitRate solution for 30 min, n = 10); and Gr 6 (10% (w/v) chromium nitRate solution for 60 min, n = 10) and Gr 7 (10% (w/v) chromium nitRate solution for 120 min, n = 10). Each group was further equally divided into two subgroups according to the type of porcelain used. Two titanium–porcelains (Vita Titankeramik and Triceram) were applied to each subgroup (n = 5). The G-value was measured with a four-point bending configuration. Following fracture testing, specimens were examined with a scanning electron microscope (SEM). Data were analysed using ANOVA and Tukey's test. Results Adhesion values were significantly affected by the type of electroplating treatment (P Conclusion Adhesion between porcelain and CP Ti can be improved by the use of chromium interlayer prior to porcelain firing.
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influence of the bonder on the adhesion of porcelain to machined titanium as determined by the strain energy Release Rate
Dental Materials, 2007Co-Authors: Michael Tholey, M V Swain, J N WaddellAbstract:Abstract Objective To determine the adhesion at the titanium–porcelain interface using a fracture mechanics approach, and to investigate the bonding mechanism using SEM. Methods Specimens of five different titanium–porcelain and one base metal–porcelain bonding systems were prepared for a four-point bending interfacial delaminating test on a universal testing machine. The pre-cracked specimen was subjected to load and the strain energy Release Rate ( G , J/m 2 ) was calculated from the critical load to induce stable crack extension in each system. The interface for the various materials was investigated in an SEM and compared. Results The titanium–porcelain with Gold Bonder showed the highest G -value (72.39 ± 13.21 J/m 2 ) among the groups whilst titanium–porcelain with cross-cut-bur preparation showed the lowest (5.78 ± 1.39 J/m 2 ). The former was significantly higher than that of Wiron ® 99 (base-metal, BEGO, Germany) porcelain (40.01 ± 6.67 J/m 2 ), a clinically accepted bonding system for many years. The G -values of porcelain fused to titanium-Rocatec, titanium-sandblasted and/or titanium-GC-Bonder were 10.81 ± 1.49, 12.64 ± 3.01 and 35.74 ± 5.20 J/m 2 , respectively. SEM images of the interface fracture crack path for the different bonders enabled the mechanisms responsible for the differences in strain energy Release Rates to be appreciated. Conclusion The strain energy Release Rate ( G ) of titanium–porcelain with a Gold Bonder interface layer was highest among the five different systems.
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evaluation of the strain energy Release Rate for the fracture of titanium porcelain interfacial bonding
Biomaterials, 1997Co-Authors: H G P Chung, M V Swain, T MoriAbstract:An attempt has been made to measure the critical strain energy Release Rate or interfacial toughness between an oxide coating and metal layer in the present study. Twelve pure titanium cast plates veneered with transparent incisal porcelain were subjected to four-point bending after introducing a precrack through a controlled notch on the ceramic veneer. Cycles of loading and unloading at crosshead speed of 0.1 mm min−1 were repeated and extension of the crack along the interfacial oxide layer was observed through the transparent porcelain. Parallelled extension with the initial notch at each loading was observed and multiple loading was possible until the crack reached the inner loading points. Fracture resistance was calculated by dividing the energy value determined from a force-displacement curve by the corresponding fracture area. A theoretical calculation of the fracture resistance using a formula developed by Charalambides et al. (J. Appl. Mech., 1989, 56, 77–82) was also estimated. The result from the two methods agreed well (R2 = 0.75) but the theoretical calculation (16.06 ± 4.53 J m2) gave lower average value than the other value (18.29 ± 4.23 J m2), (p < 0.05). These preliminary results indicate that this novel technique is a suitable means for quantifying interfacial toughness of porcelain—metallic bonding.
B Vieille - One of the best experts on this subject based on the ideXlab platform.
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Numerical estimation of the mode I strain energy Release Rate in woven-ply thermoplastic-based composites at high temperature based on Gθ method
Theoretical and Applied Fracture Mechanics, 2019Co-Authors: M Chabchoub, B Vieille, Rostand Moutou PittiAbstract:The present work was aimed at estimating the mode I strain energy Release Rate at crack initiation in woven-ply thermoplastic (TP) based laminates at high temperature T>T g . A linear spectral viscoelastic model and a generalized Norton viscoplastic model were used to account for the time-dependent behavior of TP-based composite laminates, which are exacerbated at high temperature. To precisely evaluate the fracture parameters (e.g. R-curves) in TP composites, a study on the mesh type and its refinement was carried out. Using the finite element code Cast3m, the G θ method was applied in order to test its capability to determine the mode I strain energy Release Rate for different testing conditions. (5)-Harness satin weave carbon fabric reinforced PolyPhenylene Sulfide (5HS C/PPS) laminates have been studied with two different stacking sequences: a Quasi-Isotropic (QI) sequence characterized by a fibre-dominated behaviour and an Angle-Ply (AP) sequence whose behaviour is matrix-dominated. Tensile tests have been simulated on Single-Edge-Notch (SEN) specimens (with different notch lengths) subjected to quasi-static loadings in order to investigate the effect of time-dependent behaviors on translaminar failure and strain energy Release Rate. The R-curves have been derived from the computation of the strain energy Release Rate and the corresponding crack length. Ultimately, it is possible to build R-curves based on the evaluation of fracture toughness for different ratios a/w and to compare these curves to the ones obtained from experiments.
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influence of matrix ductility and toughness on strain energy Release Rate and failure behavior of woven ply reinforced thermoplastic structures at high temperature
Composites Part B-engineering, 2018Co-Authors: B Vieille, M Chabchoub, Christophe GautreletAbstract:Abstract The purpose of the present work is to investigate damage evolution in 5-harness satin weave carbon fabric reinforced PolyPhenylene Sulphide (PPS) structures with an initial edge notch. To understand how the physical properties of the constituents (e.g. matrix toughness and ductility) and the architecture of reinforcement (woven-ply) affect the fracture behavior of C/PPS laminates, it is useful to have analytical representation of the translaminar failure modes based on fracture mechanics concepts, the strain energy Release Rate G especially. Translaminar failure is determined by the combination of loading, location of defect and material heterogeneity (presence of matrix-rich regions at the crimp area in woven-ply laminates). When translaminar failure is initiated from an existing notch, a sequence of energy-absorbing events (fiber breakage, matrix cracking, fibers pull-out, fiber/matrix debonding) occurs in a region surrounding the notch tip. The knowledge of energy-absorbing processes is therefore important since they are responsible for the toughness of the composite. Depending on laminates' stacking sequence, the contribution of matrix behavior to strain energy Release Rate can be evaluated during damage in both brittle and ductile composite laminates subjected to high temperature conditions (T > T g ) when matrix ductility and toughness are enhanced. Depending on the initial notch orientation (0 or 45°), the failure mode is either a mode I or a mixed mode (I + II). The acoustic energy associated with translaminar failure was correlated with the strain energy Release Rate during translaminar failure. The total strain energy Release Rate in quasi-isotropic (QI) laminates is 6 times as low as in angle-ply (AP) laminates, suggesting that large plastic deformation (due to a matrix-driven behavior and an enhanced matrix ductility at T > Tg) are instrumental in dissipating a great portion of the mechanical energy brought to the specimen in AP laminates. The “material” effect is combined with a structural one (rotation of the fibers) at the crack tip, and leads to ductile failure. Both effects contribute to high fracture toughness in AP laminates.
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influence of stress concentration factor on the evolution of the strain energy Release Rate at high temperature in highly ductile carbon fibers reinforced thermoplastic structures
International Conference Design and Modeling of Mechanical Systems, 2017Co-Authors: M Chabchoub, B Vieille, Christophe Gautrelet, Moez Beyaoui, M Taktak, M Haddar, Lakhdar TalebAbstract:This work was aimed at investigating the influence of stress concentration factor on the evolution of the strain energy Release Rate J in 5-harness satin weave carbon fabrics reinforced Polyphenylene sulphide (PPS) structures at 120 °C (higher than the transition temperature Tg). The studied angle-ply (AP) laminates are characterized by a highly ductile behavior. For this purpose, the load separation method, as well as the compliance method, are applied in order to determine the strain energy Release Rate J for different crack length over specimen width ratios a/W. A fractographic analysis was conducted to understand the chronology of damage mechanisms which significantly depends on the enhanced PPS matrix ductility and toughness at T > Tg. An acoustic emission (AE) technique was used to investigate the correlation between the energy Released during translaminar cracking and the cumulative AE energy/events for different stress concentration factors. Fibers breakage appears to be not very energetic from the AE standpoint. Finally, blunting is instrumental in increasing the strain energy Release Rate in specimens with low-stress concentration factors, due to large plastic deformations at the crack tip.
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investigations on crack propagation and strain energy Release Rate in notched woven ply thermoplastic laminates at high temperature
International Journal of Applied Mechanics, 2016Co-Authors: M Chabchoub, B Vieille, Moez Beyaoui, M Taktak, Mohamed Haddar, Lakhdar TalebAbstract:The strain energy Release Rate G is of prime importance in composite materials fracture mechanics. In order to experimentally and numerically evaluate this parameter in the case of quasi-isotropic and angle-ply (AP) woven-ply thermoplastic (TP) laminates, single edge notched (SEN) specimens have been subjected to monotonic tensile loading at T > Tg when the toughness and the viscous behavior of the (TP) matrix are exacerbated. From the simulation standpoint, a particular attention was paid to the type of meshing as well as its refinement in the vicinity of the crack tip where the triaxiality Rate leads to significant stress concentrations. For this purpose, a linear spectral viscoelastic and a generalized Norton-type viscoplastic models have been used. A comparison between two types of meshing (radiant and concentric) has been conducted. Both types of meshing allow us to define crowns in order to represent the surface of the integration ring around the crack tip. These crowns are necessary to evaluate the strain energy Release Rate GI in opening mode using Gθ-integral computation. Both overstress and overstrain profiles near the crack tip were investigated and validated using theoretical stress fields derived from the linear elastic fracture mechanics (LEFM) framework and overstrain fields obtained from digital image correlation (DIC) to verify the model’s ability to provide accuRate mechanical fields at singularity zones.
Christophe Gautrelet - One of the best experts on this subject based on the ideXlab platform.
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influence of matrix ductility and toughness on strain energy Release Rate and failure behavior of woven ply reinforced thermoplastic structures at high temperature
Composites Part B-engineering, 2018Co-Authors: B Vieille, M Chabchoub, Christophe GautreletAbstract:Abstract The purpose of the present work is to investigate damage evolution in 5-harness satin weave carbon fabric reinforced PolyPhenylene Sulphide (PPS) structures with an initial edge notch. To understand how the physical properties of the constituents (e.g. matrix toughness and ductility) and the architecture of reinforcement (woven-ply) affect the fracture behavior of C/PPS laminates, it is useful to have analytical representation of the translaminar failure modes based on fracture mechanics concepts, the strain energy Release Rate G especially. Translaminar failure is determined by the combination of loading, location of defect and material heterogeneity (presence of matrix-rich regions at the crimp area in woven-ply laminates). When translaminar failure is initiated from an existing notch, a sequence of energy-absorbing events (fiber breakage, matrix cracking, fibers pull-out, fiber/matrix debonding) occurs in a region surrounding the notch tip. The knowledge of energy-absorbing processes is therefore important since they are responsible for the toughness of the composite. Depending on laminates' stacking sequence, the contribution of matrix behavior to strain energy Release Rate can be evaluated during damage in both brittle and ductile composite laminates subjected to high temperature conditions (T > T g ) when matrix ductility and toughness are enhanced. Depending on the initial notch orientation (0 or 45°), the failure mode is either a mode I or a mixed mode (I + II). The acoustic energy associated with translaminar failure was correlated with the strain energy Release Rate during translaminar failure. The total strain energy Release Rate in quasi-isotropic (QI) laminates is 6 times as low as in angle-ply (AP) laminates, suggesting that large plastic deformation (due to a matrix-driven behavior and an enhanced matrix ductility at T > Tg) are instrumental in dissipating a great portion of the mechanical energy brought to the specimen in AP laminates. The “material” effect is combined with a structural one (rotation of the fibers) at the crack tip, and leads to ductile failure. Both effects contribute to high fracture toughness in AP laminates.
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influence of stress concentration factor on the evolution of the strain energy Release Rate at high temperature in highly ductile carbon fibers reinforced thermoplastic structures
International Conference Design and Modeling of Mechanical Systems, 2017Co-Authors: M Chabchoub, B Vieille, Christophe Gautrelet, Moez Beyaoui, M Taktak, M Haddar, Lakhdar TalebAbstract:This work was aimed at investigating the influence of stress concentration factor on the evolution of the strain energy Release Rate J in 5-harness satin weave carbon fabrics reinforced Polyphenylene sulphide (PPS) structures at 120 °C (higher than the transition temperature Tg). The studied angle-ply (AP) laminates are characterized by a highly ductile behavior. For this purpose, the load separation method, as well as the compliance method, are applied in order to determine the strain energy Release Rate J for different crack length over specimen width ratios a/W. A fractographic analysis was conducted to understand the chronology of damage mechanisms which significantly depends on the enhanced PPS matrix ductility and toughness at T > Tg. An acoustic emission (AE) technique was used to investigate the correlation between the energy Released during translaminar cracking and the cumulative AE energy/events for different stress concentration factors. Fibers breakage appears to be not very energetic from the AE standpoint. Finally, blunting is instrumental in increasing the strain energy Release Rate in specimens with low-stress concentration factors, due to large plastic deformations at the crack tip.
Denys Gamby - One of the best experts on this subject based on the ideXlab platform.
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Strain Energy Release Rate Analyse of Matrix Micro Cracking in Composite Cross-Ply Laminates
Materials Sciences and Applications, 2011Co-Authors: Jean-luc Rebiere, Denys GambyAbstract:The stress field distribution in composite cross ply laminates damaged by matrix cracking is analysed through an approach which uses several hypotheses to simplify the damage state. The proposed cracking criterion involves the partial components of the strain energy Release Rate associated with transverse and longitudinal cracking. The respective contributions of the 0° and 90° layers to the damage process are also investigated. The initiation of transverse and longitudinal cracking mechanisms is predicted. We also give an assessment of the influence of each individual component of the stress tensor on the strain energy Release Rate of the damaged laminate.
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a decomposition of the strain energy Release Rate associated with the initiation of transverse cracking longitudinal cracking and delamination in cross ply laminates
Composite Structures, 2008Co-Authors: Jean-luc Rebiere, Denys GambyAbstract:An energy criterion is proposed to study the damage evolution in a composite cross-ply laminate. This criterion is based on the computation of the partial strain energy Release Rate associated with each damage mechanism (transverse cracking, longitudinal cracking and delamination) and mode (I, II or III). Several decompositions of the complementary strain energy are put forward. Each component part of this decomposition is related to a specific damage mechanism and loading mode. The related criterion can predict and describe the initiation and propagation of the different damage mechanisms.