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Wei-ze Wang - One of the best experts on this subject based on the ideXlab platform.
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Measurement of Fracture Toughness of Plasma‐Sprayed Al2O3 Coatings Using a Tapered Double Cantilever Beam Method
Journal of the American Ceramic Society, 2003Co-Authors: Chang-jiu Li, Wei-ze Wang, Yong HeAbstract:The fracture toughness of plasma-sprayed Al 2 O 3 coatings in terms of the critical strain energy release rate G Ic was measured using a tapered double Cantilever Beam (TDCB) approach. The fracture surfaces were examined using a scanning electron microscope (SEM). The measurement yielded the mean G Ic values from 13 to 27 J/m 2 for the sprayed Al 2 O 3 coatings at different spray distances. These values agree well with those obtained by the conventional double Cantilever Beam approach. The dependence of the observed G Ic on spray distance is consistent with that for the lamellar bonding ratio. These results suggest that the TDCB test is a reliable approach for measuring the G Ic of thermal-spray coatings without the crack-length measurement.
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measurement of fracture toughness of plasma sprayed al2o3 coatings using a tapered double Cantilever Beam Method
Journal of the American Ceramic Society, 2003Co-Authors: Wei-ze WangAbstract:The fracture toughness of plasma-sprayed Al 2 O 3 coatings in terms of the critical strain energy release rate G Ic was measured using a tapered double Cantilever Beam (TDCB) approach. The fracture surfaces were examined using a scanning electron microscope (SEM). The measurement yielded the mean G Ic values from 13 to 27 J/m 2 for the sprayed Al 2 O 3 coatings at different spray distances. These values agree well with those obtained by the conventional double Cantilever Beam approach. The dependence of the observed G Ic on spray distance is consistent with that for the lamellar bonding ratio. These results suggest that the TDCB test is a reliable approach for measuring the G Ic of thermal-spray coatings without the crack-length measurement.
Dj. Greving - One of the best experts on this subject based on the ideXlab platform.
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In situ evaluations of Young`s modulus and Poisson`s ratio using a Cantilever Beam specimen
1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young`s modulus and Poisson`s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, bond strength, fracture toughness, and fatigue crack growth rates. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young`s modulus and Poisson`s ratio in situ. A Cantilever Beam Method to evaluate the Young`s modulus and Poisson`s ratio of thermal spray coatings is presented. The Method requires only inexpensive materials and instruments and makes use of laminated plate theory to computer Young`s modulus and Poisson`s ratio from data on deformations of the Cantilever Beam under static loads. A sensitivity analysis of the Method has shown the Method to be accurate over a wide range of coatings and substrate materials. The Method is verified by comparing predicted values of Young`s modulus and Poisson`s ratio with reference values from a three-dimensional finite element analysis of the thermal spray coated Cantilever Beam. The Method was applied to evaluate the Young`s modulus and Poisson`s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ. The Cantilever Beam Method to evaluate the Young’s modulus and Poisson’s ratio of thermal spray coat-ings is presented. The Method uses strain gages located on the coating and substrate surfaces. A series of increasing loads is applied to the end of the Cantilever Beam. The moment at the gaged section is calcu-lated. Using a laminated plate bending theory, the Young’s modulus and Poisson’s ratio are inferred based on a least squares fit of the equilibrium equations. The Method is verified by comparing predicted values of Young’s modulus and Poisson’s ratio with reference values from a three-dimensional finite ele-ment analysis of the thermal spray coated Cantilever Beam. The sensitivity of the Method is examined with respect to the accuracy of measured quantities such as strain gage readings, specimen dimensions, ap-plied bending moment, and substrate mechanical properties. The Method is applied to evaluate the Young’s modulus and Poisson’s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.
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a Cantilever Beam Method for evaluating young s modulus and poisson s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.
E. F. Rybicki - One of the best experts on this subject based on the ideXlab platform.
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In situ evaluations of Young`s modulus and Poisson`s ratio using a Cantilever Beam specimen
1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young`s modulus and Poisson`s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, bond strength, fracture toughness, and fatigue crack growth rates. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young`s modulus and Poisson`s ratio in situ. A Cantilever Beam Method to evaluate the Young`s modulus and Poisson`s ratio of thermal spray coatings is presented. The Method requires only inexpensive materials and instruments and makes use of laminated plate theory to computer Young`s modulus and Poisson`s ratio from data on deformations of the Cantilever Beam under static loads. A sensitivity analysis of the Method has shown the Method to be accurate over a wide range of coatings and substrate materials. The Method is verified by comparing predicted values of Young`s modulus and Poisson`s ratio with reference values from a three-dimensional finite element analysis of the thermal spray coated Cantilever Beam. The Method was applied to evaluate the Young`s modulus and Poisson`s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ. The Cantilever Beam Method to evaluate the Young’s modulus and Poisson’s ratio of thermal spray coat-ings is presented. The Method uses strain gages located on the coating and substrate surfaces. A series of increasing loads is applied to the end of the Cantilever Beam. The moment at the gaged section is calcu-lated. Using a laminated plate bending theory, the Young’s modulus and Poisson’s ratio are inferred based on a least squares fit of the equilibrium equations. The Method is verified by comparing predicted values of Young’s modulus and Poisson’s ratio with reference values from a three-dimensional finite ele-ment analysis of the thermal spray coated Cantilever Beam. The sensitivity of the Method is examined with respect to the accuracy of measured quantities such as strain gage readings, specimen dimensions, ap-plied bending moment, and substrate mechanical properties. The Method is applied to evaluate the Young’s modulus and Poisson’s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.
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a Cantilever Beam Method for evaluating young s modulus and poisson s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.
J. M. Lefebvre - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of the non-isothermal fusion-welding of unlike ethylene copolymers over a wide crystallinity range
Polymer, 2013Co-Authors: C. Frederix, P. Beauchene, Roland Seguela, J. M. LefebvreAbstract:Abstract The non-isothermal fusion-welding of unlike polyethylene materials has been studied using three linear ethylene copolymers covering the crystallinity range 16–77% and displaying partial miscibility of the binary blends. Welding was carried out by putting into intimate contact under slight pressure the molten surfaces of two flat Beams quickly heated up far above the melting point by means of infrared radiations. Particular attention was paid to the wetting of the Beams using ultrasonic measurements. The interface adhesion strength was determined by means of double Cantilever Beam Method. Homo- as well as hetero-welding proved to be highly efficient for only a few seconds of contact of the two Beams in the molten state. The critical strain energy release rate of the interface reached values G1C ≥ 6 kJ/m2 for contact time less than 10 s. The time window of efficient welding proved to be intermediate between the number-average and weight-average values of the terminal relaxation time according to melt rheology. This is consistent with Wool's criterion assuming that perfect self-welding of amorphous polymer requires reptation of chains over their whole length through the interface. The longer chains yet seemed not to be able to achieve complete tube renewal during the experimental time window of efficient welding. It is suggested that the reptation of the shortest chains contributes to the restoration of the entanglement network of the longest chains within a time scale much shorter than the reptation time of the latter ones. The surprising efficiency of hetero-welding in agreement with Wool's criterion is attributed to the interfacial miscibility of the unlike copolymers. The concomitant role of cocrystallization in the process is pointed out for such semi-crystalline polymers.
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Kinetics of the non-isothermal fusion-welding of unlike ethylene copolymers over a wide crystallinity range
Polymer, 2013Co-Authors: C. Frederix, P. Beauchene, Roland Seguela, J. M. LefebvreAbstract:The non-isothermal fusion-welding of unlike polyethylene materials has been studied using three linear ethylene copolymers covering the crystallinity range 16-77% and displaying partial miscibility of the binary blends. Welding was carried out by putting into intimate contact under slight pressure the molten surfaces of two flat Beams quickly heated up far above the melting point by means of infrared radiations. Particular attention was paid to the wetting of the Beams using ultrasonic measurements. The interface adhesion strength was determined by means of double Cantilever Beam Method. Homo- as well as hetero-welding proved to be highly efficient for only a few seconds of contact of the two Beams in the molten state. The critical strain energy release rate of the interface reached values G(1C) >= 6 kJ/m(2) for contact time less than 10 s. The time window of efficient welding proved to be intermediate between the number-average and weight-average values of the terminal relaxation time according to melt rheology. This is consistent with Wool's criterion assuming that perfect self-welding of amorphous polymer requires reptation of chains over their whole length through the interface. The longer chains yet seemed not to be able to achieve complete tube renewal during the experimental time window of efficient welding. It is suggested that the reptation of the shortest chains contributes to the restoration of the entanglement network of the longest chains within a time scale much shorter than the reptation time of the latter ones. The surprising efficiency of hetero-welding in agreement with Wool's criterion is attributed to the interfacial miscibility of the unlike copolymers. The concomitant role of cocrystallization in the process is pointed out for such semi-crystalline polymers. (C) 2013 Elsevier Ltd. All rights reserved.
Y. Xiong - One of the best experts on this subject based on the ideXlab platform.
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In situ evaluations of Young`s modulus and Poisson`s ratio using a Cantilever Beam specimen
1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young`s modulus and Poisson`s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, bond strength, fracture toughness, and fatigue crack growth rates. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young`s modulus and Poisson`s ratio in situ. A Cantilever Beam Method to evaluate the Young`s modulus and Poisson`s ratio of thermal spray coatings is presented. The Method requires only inexpensive materials and instruments and makes use of laminated plate theory to computer Young`s modulus and Poisson`s ratio from data on deformations of the Cantilever Beam under static loads. A sensitivity analysis of the Method has shown the Method to be accurate over a wide range of coatings and substrate materials. The Method is verified by comparing predicted values of Young`s modulus and Poisson`s ratio with reference values from a three-dimensional finite element analysis of the thermal spray coated Cantilever Beam. The Method was applied to evaluate the Young`s modulus and Poisson`s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ. The Cantilever Beam Method to evaluate the Young’s modulus and Poisson’s ratio of thermal spray coat-ings is presented. The Method uses strain gages located on the coating and substrate surfaces. A series of increasing loads is applied to the end of the Cantilever Beam. The moment at the gaged section is calcu-lated. Using a laminated plate bending theory, the Young’s modulus and Poisson’s ratio are inferred based on a least squares fit of the equilibrium equations. The Method is verified by comparing predicted values of Young’s modulus and Poisson’s ratio with reference values from a three-dimensional finite ele-ment analysis of the thermal spray coated Cantilever Beam. The sensitivity of the Method is examined with respect to the accuracy of measured quantities such as strain gage readings, specimen dimensions, ap-plied bending moment, and substrate mechanical properties. The Method is applied to evaluate the Young’s modulus and Poisson’s ratio of four thermal spray coatings of industrial importance.
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A Cantilever Beam Method for evaluating Young’s modulus and Poisson’s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.
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a Cantilever Beam Method for evaluating young s modulus and poisson s ratio of thermal spray coatings
Journal of Thermal Spray Technology, 1995Co-Authors: E. F. Rybicki, J. R. Shadley, Y. Xiong, Dj. GrevingAbstract:Young’s modulus and Poisson’s ratio for thermal spray coatings are needed to evaluate properties and characteristics of thermal spray coatings such as residual stresses, fracture toughness, and fatigue crack growth rates. It is difficult to evaluate Young’s modulus and Poisson’s ratio of thermal spray coatings be-cause coatings are usually thin and attached to a thicker and much stiffer substrate. Under loading, the substrate restricts the coating from deforming. Since coatings are used while bonded to a substrate, it is desirable to have a procedure to evaluate Young’s modulus and Poisson’s ratio in situ.