The Experts below are selected from a list of 207 Experts worldwide ranked by ideXlab platform
Xuming Su - One of the best experts on this subject based on the ideXlab platform.
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fatigue behavior and life prediction of self piercing Riveted Joint
International Journal of Fatigue, 2016Co-Authors: Li Huang, Xuming SuAbstract:Abstract The fatigue behavior of self-piercing Riveted Joints of aluminum alloy AA6111-T4 and steel HSLA340 sheets has been experimentally and numerically investigated in present paper. Fatigue results reveal that the mating sheet stiffness and load ratio have significant impact on the fatigue strength, and the dominant failure mode under tensile–shear loading is eyebrow crack with an approximately semi-elliptical crack front. New stress intensity factor equations are derived for a semi-elliptical surface crack in a finite plate near a rigid cylindrical inclusion with axial shear force and bending moment, including the ratio of crack depth to crack length ranged from 0.2 to 1 and the ratio of crack depth to sheet thickness ranged from 0.2 to 0.8. A new structural load fatigue crack growth model is proposed, and predictions of fatigue lives and final crack aspect ratios show good agreement with experimental results.
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fatigue and fretting of mixed metal self piercing Riveted Joint
International Journal of Fatigue, 2016Co-Authors: Li Huang, John Joseph Francis Bonnen, John Lasecki, Xuming SuAbstract:Abstract The fatigue behavior of self-piercing rivet (SPR) Joints joining differing thicknesses of AA6111-T4 aluminum and HSLA340 steel sheets in lap shear geometry was investigated in this paper. Crack initiation in the aluminum sheet was the dominant failure mode, while unexpected rivet shank failure tended to occur at high loading levels. Fretting wear was also observed at interface between aluminum and steel sheets as well as between the rivet and sheets under sinusoidal cyclic tension–tension loading. An Energy Dispersive X-ray (EDX) analysis of fretting debris revealed the presence of oxides of aluminum and zinc. Fretting was shown to be critical to crack initiation. For initiations in the aluminum sheet, micro cracks were found to nucleate early in the fatigue life, and crack initiation life was found to be much shorter than crack growth life.
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fatigue and fretting of mixed metal self piercing Riveted Joint
Volume 14: Emerging Technologies; Engineering Management Safety Ethics Society and Education; Materials: Genetics to Structures, 2014Co-Authors: Li Huang, John Lasecki, Xuming SuAbstract:The fatigue behavior of self-piercing riveting (SPR) Joint, joining aluminum alloy 6111T4 and steel HSLA340 sheets with lapshear geometry was investigated in this paper. Sheet crack was the dominant failure mode, while unexpected rivet shank failure tended to occur under high loading level. Fretting wear was observed at interface of aluminum and steel layers, as well as at rivet and sheets under sinusoidal cyclic tension-tension loading. An energy dispersive X-ray (EDX) analysis of fretting debris revealed the presence of oxide of aluminum and zinc. Fretting was shown to be critical as crack initiation spot. In sheet failure mode, micro cracks were found to initiate at early stage, and crack initiation life was much shorter than crack growth life.Copyright © 2014 by ASME
P Drazetic - One of the best experts on this subject based on the ideXlab platform.
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an alternative numerical approach for full scale characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper describes a pure numerical methodology (FE database) to improve the representativeness of Joint equivalent models for airframe crashworthiness. This method is based on material constitutive models and failure criterion in accurate 3D FE simulations. The interest of FE simulations is to define the dynamic strength of many types of Riveted Joints with a reduced cost compared to a pure experimental way. The FE database method is carried out on elementary Riveted Joints to predict and to analyse: first the post-riveting initial strain and stress state, and second several kinds of Joint failure (e.g., crack propagation, rivet shearing or pull-out). The aim of the first step is to start the mechanical strength simulations with a correct deformed shape and post-riveting state. The responses of 3D Riveted Joint simulations can then be considered as reference and be used to optimise the mechanical properties of equivalent Joint elements. A new equivalent Joint element is developed to improve the representativeness of an airframe crash simulation.
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full scale experimental characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper deals with experimental works the objective of which aims at improving the design of Riveted Joints for airframe crashworthiness purposes. Complex assemblies are considered at this stage as the sum of simpler ones constituted of 1 rivet and 2 plates, the behaviour of which is investigated under different points of view. Research is divided in two major parts. The first one investigates the consequence of rivet processing in term of possible material and structural embrittlement (residual stress and strain in rivets and plates). In the second part, the overall behaviour and strength of the considered basic assembly (1 rivet and 2 plates) is studied. The aim is here to characterise basic failure modes of assemblies linked to rivet failure or crack propagation in punched metal plates. The measurements of local variables enable to assess the influence or not of dynamics on the different failure mechanisms. Eventually, an original test procedure based on the ARCAN test rig is presented, the objective of which is to give access to multi-axial failure criterions for rivets.
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Riveted Joint modeling for numerical analysis of airframe crashworthiness
Finite Elements in Analysis and Design, 2001Co-Authors: Bertrand Langrand, E Markiewicz, E Deletombe, P DrazeticAbstract:Abstract Numerous rivets have to be taken into account to simulate the behavior of aeronautical frames under crash loading conditions. Until now this type of bonding modeling has not been judged satisfactory. The influence of structural embrittlement due to the riveting process, the strength of a Riveted Joint under dynamic loading and the characterization of a simplified rivet element, in particular, were sources of questions. For each topic, we did solid finite element modeling and carried out experiments to measure the influence of strain rates under quasi-static and dynamic loading conditions. We also determined the elastic–plastic and damage mechanical properties for sheet metal plates and rivet materials. Our results showed that it was essential to develop a new kind of rivet element taking material non-linearities into account. Experiments and solid finite element modeling of an adapted Arcan test procedure were then conducted and pure shear and tensile non-linear responses as well as parameters of a macroscopic criterion were identified. The use of this new rivet element was found to improve prediction of the dynamic behavior for a frame assembled with 700 rivets.
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analysis of Riveted Joint failure under mixed mode loading
European journal of mechanical and environmental engineering, 1999Co-Authors: L Patronelli, E Markiewicz, Bertrand Langrand, E Deletombe, P DrazeticAbstract:Numerous rivets have to be modelled for simulation of aeronautical framework crashes. For this kind of application, rivets are modelled with equivalent elements. Failure mode of such elements is defined with a mixed shear/tension law. To characterise rivet failure under mixed mode loading, experiments and FE simulation of the ARCAN test procedure are undertaken with a 7050 aluminium alloy countersunk rivet. Results show that both approaches predict well the rivet failure criterion. Moreover FE tools also resolve design related problems of new Riveted Joint assemblies more rapidly and cost effectively than experiments. An analytical and optimisation method are used to identify the parameter of a mathematical failure criterion of the Riveted Joint. These two methods are then compared. The analytical method is unsatisfactory when compared to the optimisation method.
Li Huang - One of the best experts on this subject based on the ideXlab platform.
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fatigue behavior and life prediction of self piercing Riveted Joint
International Journal of Fatigue, 2016Co-Authors: Li Huang, Xuming SuAbstract:Abstract The fatigue behavior of self-piercing Riveted Joints of aluminum alloy AA6111-T4 and steel HSLA340 sheets has been experimentally and numerically investigated in present paper. Fatigue results reveal that the mating sheet stiffness and load ratio have significant impact on the fatigue strength, and the dominant failure mode under tensile–shear loading is eyebrow crack with an approximately semi-elliptical crack front. New stress intensity factor equations are derived for a semi-elliptical surface crack in a finite plate near a rigid cylindrical inclusion with axial shear force and bending moment, including the ratio of crack depth to crack length ranged from 0.2 to 1 and the ratio of crack depth to sheet thickness ranged from 0.2 to 0.8. A new structural load fatigue crack growth model is proposed, and predictions of fatigue lives and final crack aspect ratios show good agreement with experimental results.
-
fatigue and fretting of mixed metal self piercing Riveted Joint
International Journal of Fatigue, 2016Co-Authors: Li Huang, John Joseph Francis Bonnen, John Lasecki, Xuming SuAbstract:Abstract The fatigue behavior of self-piercing rivet (SPR) Joints joining differing thicknesses of AA6111-T4 aluminum and HSLA340 steel sheets in lap shear geometry was investigated in this paper. Crack initiation in the aluminum sheet was the dominant failure mode, while unexpected rivet shank failure tended to occur at high loading levels. Fretting wear was also observed at interface between aluminum and steel sheets as well as between the rivet and sheets under sinusoidal cyclic tension–tension loading. An Energy Dispersive X-ray (EDX) analysis of fretting debris revealed the presence of oxides of aluminum and zinc. Fretting was shown to be critical to crack initiation. For initiations in the aluminum sheet, micro cracks were found to nucleate early in the fatigue life, and crack initiation life was found to be much shorter than crack growth life.
-
fatigue and fretting of mixed metal self piercing Riveted Joint
Volume 14: Emerging Technologies; Engineering Management Safety Ethics Society and Education; Materials: Genetics to Structures, 2014Co-Authors: Li Huang, John Lasecki, Xuming SuAbstract:The fatigue behavior of self-piercing riveting (SPR) Joint, joining aluminum alloy 6111T4 and steel HSLA340 sheets with lapshear geometry was investigated in this paper. Sheet crack was the dominant failure mode, while unexpected rivet shank failure tended to occur under high loading level. Fretting wear was observed at interface of aluminum and steel layers, as well as at rivet and sheets under sinusoidal cyclic tension-tension loading. An energy dispersive X-ray (EDX) analysis of fretting debris revealed the presence of oxide of aluminum and zinc. Fretting was shown to be critical as crack initiation spot. In sheet failure mode, micro cracks were found to initiate at early stage, and crack initiation life was much shorter than crack growth life.Copyright © 2014 by ASME
Bertrand Langrand - One of the best experts on this subject based on the ideXlab platform.
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an alternative numerical approach for full scale characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper describes a pure numerical methodology (FE database) to improve the representativeness of Joint equivalent models for airframe crashworthiness. This method is based on material constitutive models and failure criterion in accurate 3D FE simulations. The interest of FE simulations is to define the dynamic strength of many types of Riveted Joints with a reduced cost compared to a pure experimental way. The FE database method is carried out on elementary Riveted Joints to predict and to analyse: first the post-riveting initial strain and stress state, and second several kinds of Joint failure (e.g., crack propagation, rivet shearing or pull-out). The aim of the first step is to start the mechanical strength simulations with a correct deformed shape and post-riveting state. The responses of 3D Riveted Joint simulations can then be considered as reference and be used to optimise the mechanical properties of equivalent Joint elements. A new equivalent Joint element is developed to improve the representativeness of an airframe crash simulation.
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full scale experimental characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper deals with experimental works the objective of which aims at improving the design of Riveted Joints for airframe crashworthiness purposes. Complex assemblies are considered at this stage as the sum of simpler ones constituted of 1 rivet and 2 plates, the behaviour of which is investigated under different points of view. Research is divided in two major parts. The first one investigates the consequence of rivet processing in term of possible material and structural embrittlement (residual stress and strain in rivets and plates). In the second part, the overall behaviour and strength of the considered basic assembly (1 rivet and 2 plates) is studied. The aim is here to characterise basic failure modes of assemblies linked to rivet failure or crack propagation in punched metal plates. The measurements of local variables enable to assess the influence or not of dynamics on the different failure mechanisms. Eventually, an original test procedure based on the ARCAN test rig is presented, the objective of which is to give access to multi-axial failure criterions for rivets.
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Riveted Joint modeling for numerical analysis of airframe crashworthiness
Finite Elements in Analysis and Design, 2001Co-Authors: Bertrand Langrand, E Markiewicz, E Deletombe, P DrazeticAbstract:Abstract Numerous rivets have to be taken into account to simulate the behavior of aeronautical frames under crash loading conditions. Until now this type of bonding modeling has not been judged satisfactory. The influence of structural embrittlement due to the riveting process, the strength of a Riveted Joint under dynamic loading and the characterization of a simplified rivet element, in particular, were sources of questions. For each topic, we did solid finite element modeling and carried out experiments to measure the influence of strain rates under quasi-static and dynamic loading conditions. We also determined the elastic–plastic and damage mechanical properties for sheet metal plates and rivet materials. Our results showed that it was essential to develop a new kind of rivet element taking material non-linearities into account. Experiments and solid finite element modeling of an adapted Arcan test procedure were then conducted and pure shear and tensile non-linear responses as well as parameters of a macroscopic criterion were identified. The use of this new rivet element was found to improve prediction of the dynamic behavior for a frame assembled with 700 rivets.
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identification of nonlinear dynamic behavior and failure for Riveted Joint assemblies
Shock and Vibration, 2000Co-Authors: Bertrand Langrand, E Deletombe, E MarkiewiczAbstract:Many different types of rivets need to be modeled to analyze the crashworthiness of aircraft structures. A numerical procedure based on FE modeling and characterization of material failure constitutive models is proposed herein with the aim of limiting the costs of experimental procedures otherwise necessary to obtain these data. Quasi-static and dynamic experiments were carried out on elementary tension (punched) and shear (Riveted) specimens. No strain rate sensitivity was detected in the failure behavior of the Riveted Joint assemblies. Experimental data were used to identify the Gurson damage parameters of each material (2024-T351 and 7050 aluminum alloys for the sheet metal plate and the rivet respectively) by an inverse method. Characterization gave rise to satisfactory correlation between FE models and experiments. Optimized parameters were validated for each material by means of a uniaxial tension test for the sheet metal plate and an ARCAN type specimen in pure tension for the rivet.
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analysis of Riveted Joint failure under mixed mode loading
European journal of mechanical and environmental engineering, 1999Co-Authors: L Patronelli, E Markiewicz, Bertrand Langrand, E Deletombe, P DrazeticAbstract:Numerous rivets have to be modelled for simulation of aeronautical framework crashes. For this kind of application, rivets are modelled with equivalent elements. Failure mode of such elements is defined with a mixed shear/tension law. To characterise rivet failure under mixed mode loading, experiments and FE simulation of the ARCAN test procedure are undertaken with a 7050 aluminium alloy countersunk rivet. Results show that both approaches predict well the rivet failure criterion. Moreover FE tools also resolve design related problems of new Riveted Joint assemblies more rapidly and cost effectively than experiments. An analytical and optimisation method are used to identify the parameter of a mathematical failure criterion of the Riveted Joint. These two methods are then compared. The analytical method is unsatisfactory when compared to the optimisation method.
E Deletombe - One of the best experts on this subject based on the ideXlab platform.
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an alternative numerical approach for full scale characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper describes a pure numerical methodology (FE database) to improve the representativeness of Joint equivalent models for airframe crashworthiness. This method is based on material constitutive models and failure criterion in accurate 3D FE simulations. The interest of FE simulations is to define the dynamic strength of many types of Riveted Joints with a reduced cost compared to a pure experimental way. The FE database method is carried out on elementary Riveted Joints to predict and to analyse: first the post-riveting initial strain and stress state, and second several kinds of Joint failure (e.g., crack propagation, rivet shearing or pull-out). The aim of the first step is to start the mechanical strength simulations with a correct deformed shape and post-riveting state. The responses of 3D Riveted Joint simulations can then be considered as reference and be used to optimise the mechanical properties of equivalent Joint elements. A new equivalent Joint element is developed to improve the representativeness of an airframe crash simulation.
-
full scale experimental characterisation for Riveted Joint design
Aerospace Science and Technology, 2002Co-Authors: Bertrand Langrand, L Patronelli, E Markiewicz, E Deletombe, P DrazeticAbstract:This paper deals with experimental works the objective of which aims at improving the design of Riveted Joints for airframe crashworthiness purposes. Complex assemblies are considered at this stage as the sum of simpler ones constituted of 1 rivet and 2 plates, the behaviour of which is investigated under different points of view. Research is divided in two major parts. The first one investigates the consequence of rivet processing in term of possible material and structural embrittlement (residual stress and strain in rivets and plates). In the second part, the overall behaviour and strength of the considered basic assembly (1 rivet and 2 plates) is studied. The aim is here to characterise basic failure modes of assemblies linked to rivet failure or crack propagation in punched metal plates. The measurements of local variables enable to assess the influence or not of dynamics on the different failure mechanisms. Eventually, an original test procedure based on the ARCAN test rig is presented, the objective of which is to give access to multi-axial failure criterions for rivets.
-
Riveted Joint modeling for numerical analysis of airframe crashworthiness
Finite Elements in Analysis and Design, 2001Co-Authors: Bertrand Langrand, E Markiewicz, E Deletombe, P DrazeticAbstract:Abstract Numerous rivets have to be taken into account to simulate the behavior of aeronautical frames under crash loading conditions. Until now this type of bonding modeling has not been judged satisfactory. The influence of structural embrittlement due to the riveting process, the strength of a Riveted Joint under dynamic loading and the characterization of a simplified rivet element, in particular, were sources of questions. For each topic, we did solid finite element modeling and carried out experiments to measure the influence of strain rates under quasi-static and dynamic loading conditions. We also determined the elastic–plastic and damage mechanical properties for sheet metal plates and rivet materials. Our results showed that it was essential to develop a new kind of rivet element taking material non-linearities into account. Experiments and solid finite element modeling of an adapted Arcan test procedure were then conducted and pure shear and tensile non-linear responses as well as parameters of a macroscopic criterion were identified. The use of this new rivet element was found to improve prediction of the dynamic behavior for a frame assembled with 700 rivets.
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Iterative ExperirnentaYnumerica1 Procedure To Design Riveted Joints For Airframe Crashworthiness
2001Co-Authors: B. Lungrand, L Patronelli, E DeletombeAbstract:The paper deals with an iterative experimentaVnumerica1 methodology to improve FE Riveted Joint models used in airframe crashworthiness studies. Standard and specific experiments are undertaken to measure the behaviour and the strain rate sensitivity of materials for rivets and structures. Material parameters are identified for elasto-viscoplastic and damage constitutive models. Standard and specific tests are carried out and modelled to analyse the material embrittlement coming from riveting process and the dynamic failure of Riveted Joints. A specific procedure is developed for identification of equivalent rivet model for structural crashworthiness. A new rivet model is developed to improve the representativeness of airframe FE model.
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identification of nonlinear dynamic behavior and failure for Riveted Joint assemblies
Shock and Vibration, 2000Co-Authors: Bertrand Langrand, E Deletombe, E MarkiewiczAbstract:Many different types of rivets need to be modeled to analyze the crashworthiness of aircraft structures. A numerical procedure based on FE modeling and characterization of material failure constitutive models is proposed herein with the aim of limiting the costs of experimental procedures otherwise necessary to obtain these data. Quasi-static and dynamic experiments were carried out on elementary tension (punched) and shear (Riveted) specimens. No strain rate sensitivity was detected in the failure behavior of the Riveted Joint assemblies. Experimental data were used to identify the Gurson damage parameters of each material (2024-T351 and 7050 aluminum alloys for the sheet metal plate and the rivet respectively) by an inverse method. Characterization gave rise to satisfactory correlation between FE models and experiments. Optimized parameters were validated for each material by means of a uniaxial tension test for the sheet metal plate and an ARCAN type specimen in pure tension for the rivet.
