The Experts below are selected from a list of 19839 Experts worldwide ranked by ideXlab platform
Aditi Chattopadhyay - One of the best experts on this subject based on the ideXlab platform.
-
physics based multiscale Damage Criterion for fatigue crack prediction in aluminium alloy
Fatigue & Fracture of Engineering Materials & Structures, 2014Co-Authors: Jinjun Zhang, Joel Johnston, Aditi ChattopadhyayAbstract:In this paper, a physics-based multiscale approach is introduced to predict the fatigue life of crystalline metallic materials. An energy-based and slip-based Damage Criterion is developed to model two important stages of fatigue crack initiation: the nucleation and the coalescence of microcracks. At the microscale, a Damage index is developed on the basis of plastic strain energy to represent the growing rate of a nucleated microcrack. A statistical volume element model with high computational efficiency is developed at the mesoscale to represent the microstructure of the material. Also, the formation of a major crack is captured by a coalescence Criterion at mesoscale. At the macroscale, a finite element analysis of selected test articles including lug joint and cruciform is conducted with the statistical volume element model bridging two scale meshes. A comparison between experimental and simulation results shows that the multiscale Damage Criterion is capable of capturing crack initiation and predicting fatigue life.
-
crack initiation and fatigue life prediction on aluminum lug joints using statistical volume element based multiscale modeling
Journal of Intelligent Material Systems and Structures, 2013Co-Authors: Jinjun Zhang, Aditi ChattopadhyayAbstract:This article presented the application of an energy-based multiscale Damage Criterion for crack initiation and life prediction in crystalline metallic aerospace structural components under fatigue loading. A novel meso statistical volume element model was developed to improve computational efficiency compared to traditional meso representative volume element models. The key microscale factors affecting the mechanical properties of crystalline materials, including grain orientation, misorientation, principal axis direction, size, aspect ratio, and shape were considered in the formation of the statistical volume element model. The effect of several factors was studied to assess the importance in the overall macroscopic response of the material. Fatigue tests of lug joint samples were performed to validate the Damage Criterion as well as the statistical volume element model. Crack initiation was predicted within 29% accuracy, and orientation was predicted within a 2° range, which was comparable to other meth...
-
Physics‐based multiscale Damage Criterion for fatigue crack prediction in aluminium alloy
Fatigue & Fracture of Engineering Materials & Structures, 2013Co-Authors: Jinjun Zhang, Joel Johnston, Aditi ChattopadhyayAbstract:In this paper, a physics-based multiscale approach is introduced to predict the fatigue life of crystalline metallic materials. An energy-based and slip-based Damage Criterion is developed to model two important stages of fatigue crack initiation: the nucleation and the coalescence of microcracks. At the microscale, a Damage index is developed on the basis of plastic strain energy to represent the growing rate of a nucleated microcrack. A statistical volume element model with high computational efficiency is developed at the mesoscale to represent the microstructure of the material. Also, the formation of a major crack is captured by a coalescence Criterion at mesoscale. At the macroscale, a finite element analysis of selected test articles including lug joint and cruciform is conducted with the statistical volume element model bridging two scale meshes. A comparison between experimental and simulation results shows that the multiscale Damage Criterion is capable of capturing crack initiation and predicting fatigue life.
-
Crack initiation and fatigue life prediction on aluminum lug joints using statistical volume element–based multiscale modeling:
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Jinjun Zhang, Chuntao Luo, Kuang C. Liu, Aditi ChattopadhyayAbstract:This article presented the application of an energy-based multiscale Damage Criterion for crack initiation and life prediction in crystalline metallic aerospace structural components under fatigue loading. A novel meso statistical volume element model was developed to improve computational efficiency compared to traditional meso representative volume element models. The key microscale factors affecting the mechanical properties of crystalline materials, including grain orientation, misorientation, principal axis direction, size, aspect ratio, and shape were considered in the formation of the statistical volume element model. The effect of several factors was studied to assess the importance in the overall macroscopic response of the material. Fatigue tests of lug joint samples were performed to validate the Damage Criterion as well as the statistical volume element model. Crack initiation was predicted within 29% accuracy, and orientation was predicted within a 2° range, which was comparable to other meth...
-
A Statistical Volume Element Based Approach to Multiscale Modeling of Fatigue Crack Formation in AA 2024-T351
53rd AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference<BR>20th AIAA ASME AHS Adaptive Structures Conference<BR&g, 2012Co-Authors: Jinjun Zhang, Kuang C. Liu, Aditi ChattopadhyayAbstract:The objective of this paper is to develop an energyand slip-based multiscale Damage Criterion to study the formation of fatigue cracks in crystalline metallic aerospace structural components. The formation of the initial crack can be decomposed into two stages: nucleation of micro cracks and coalescence of micro cracks into a major crack. In the first stage, a crack extends from within intermetallic particles into a surrounding grain of the alloy. Fatigue Damage increments in four dependent slip planes are calculated and then measured to nucleate micro cracks. In the second stage, the micro cracks are seen to grow and coalesce, leading to the formation of a major crack. A novel meso-statistical volume element model is constructed to implement the simulation and improve computational efficiency compared to traditional representative volume element models. Fatigue tests of lug joint samples are performed to validate this multiscale Damage Criterion. The crack growing rate and direction show a good correlation between experimental data and simulation results.
Jinjun Zhang - One of the best experts on this subject based on the ideXlab platform.
-
physics based multiscale Damage Criterion for fatigue crack prediction in aluminium alloy
Fatigue & Fracture of Engineering Materials & Structures, 2014Co-Authors: Jinjun Zhang, Joel Johnston, Aditi ChattopadhyayAbstract:In this paper, a physics-based multiscale approach is introduced to predict the fatigue life of crystalline metallic materials. An energy-based and slip-based Damage Criterion is developed to model two important stages of fatigue crack initiation: the nucleation and the coalescence of microcracks. At the microscale, a Damage index is developed on the basis of plastic strain energy to represent the growing rate of a nucleated microcrack. A statistical volume element model with high computational efficiency is developed at the mesoscale to represent the microstructure of the material. Also, the formation of a major crack is captured by a coalescence Criterion at mesoscale. At the macroscale, a finite element analysis of selected test articles including lug joint and cruciform is conducted with the statistical volume element model bridging two scale meshes. A comparison between experimental and simulation results shows that the multiscale Damage Criterion is capable of capturing crack initiation and predicting fatigue life.
-
crack initiation and fatigue life prediction on aluminum lug joints using statistical volume element based multiscale modeling
Journal of Intelligent Material Systems and Structures, 2013Co-Authors: Jinjun Zhang, Aditi ChattopadhyayAbstract:This article presented the application of an energy-based multiscale Damage Criterion for crack initiation and life prediction in crystalline metallic aerospace structural components under fatigue loading. A novel meso statistical volume element model was developed to improve computational efficiency compared to traditional meso representative volume element models. The key microscale factors affecting the mechanical properties of crystalline materials, including grain orientation, misorientation, principal axis direction, size, aspect ratio, and shape were considered in the formation of the statistical volume element model. The effect of several factors was studied to assess the importance in the overall macroscopic response of the material. Fatigue tests of lug joint samples were performed to validate the Damage Criterion as well as the statistical volume element model. Crack initiation was predicted within 29% accuracy, and orientation was predicted within a 2° range, which was comparable to other meth...
-
Physics‐based multiscale Damage Criterion for fatigue crack prediction in aluminium alloy
Fatigue & Fracture of Engineering Materials & Structures, 2013Co-Authors: Jinjun Zhang, Joel Johnston, Aditi ChattopadhyayAbstract:In this paper, a physics-based multiscale approach is introduced to predict the fatigue life of crystalline metallic materials. An energy-based and slip-based Damage Criterion is developed to model two important stages of fatigue crack initiation: the nucleation and the coalescence of microcracks. At the microscale, a Damage index is developed on the basis of plastic strain energy to represent the growing rate of a nucleated microcrack. A statistical volume element model with high computational efficiency is developed at the mesoscale to represent the microstructure of the material. Also, the formation of a major crack is captured by a coalescence Criterion at mesoscale. At the macroscale, a finite element analysis of selected test articles including lug joint and cruciform is conducted with the statistical volume element model bridging two scale meshes. A comparison between experimental and simulation results shows that the multiscale Damage Criterion is capable of capturing crack initiation and predicting fatigue life.
-
Crack initiation and fatigue life prediction on aluminum lug joints using statistical volume element–based multiscale modeling:
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Jinjun Zhang, Chuntao Luo, Kuang C. Liu, Aditi ChattopadhyayAbstract:This article presented the application of an energy-based multiscale Damage Criterion for crack initiation and life prediction in crystalline metallic aerospace structural components under fatigue loading. A novel meso statistical volume element model was developed to improve computational efficiency compared to traditional meso representative volume element models. The key microscale factors affecting the mechanical properties of crystalline materials, including grain orientation, misorientation, principal axis direction, size, aspect ratio, and shape were considered in the formation of the statistical volume element model. The effect of several factors was studied to assess the importance in the overall macroscopic response of the material. Fatigue tests of lug joint samples were performed to validate the Damage Criterion as well as the statistical volume element model. Crack initiation was predicted within 29% accuracy, and orientation was predicted within a 2° range, which was comparable to other meth...
-
A Statistical Volume Element Based Approach to Multiscale Modeling of Fatigue Crack Formation in AA 2024-T351
53rd AIAA ASME ASCE AHS ASC Structures Structural Dynamics and Materials Conference<BR>20th AIAA ASME AHS Adaptive Structures Conference<BR&g, 2012Co-Authors: Jinjun Zhang, Kuang C. Liu, Aditi ChattopadhyayAbstract:The objective of this paper is to develop an energyand slip-based multiscale Damage Criterion to study the formation of fatigue cracks in crystalline metallic aerospace structural components. The formation of the initial crack can be decomposed into two stages: nucleation of micro cracks and coalescence of micro cracks into a major crack. In the first stage, a crack extends from within intermetallic particles into a surrounding grain of the alloy. Fatigue Damage increments in four dependent slip planes are calculated and then measured to nucleate micro cracks. In the second stage, the micro cracks are seen to grow and coalesce, leading to the formation of a major crack. A novel meso-statistical volume element model is constructed to implement the simulation and improve computational efficiency compared to traditional representative volume element models. Fatigue tests of lug joint samples are performed to validate this multiscale Damage Criterion. The crack growing rate and direction show a good correlation between experimental data and simulation results.
Zhongxian Li - One of the best experts on this subject based on the ideXlab platform.
-
numerical derivation of pressure impulse diagrams for prediction of rc column Damage to blast loads
International Journal of Impact Engineering, 2008Co-Authors: Zhongxian LiAbstract:Pressure–impulse (P–I) diagrams are commonly used in the preliminary design or assessment of protective structures to establish safe response limits for given blast-loading scenarios. Current practice in generating the pressure–impulse diagram for structure components is primarily based on the simplified single degree of freedom (SDOF) model. The Damage Criterion is usually defined in terms of deformation or displacement response. Under blast loads, structures usually respond at their local modes, the equivalent SDOF system derived using the fundamental structure response mode might not be suitable. Moreover, structure is often Damaged owing to brittle shear failure. In this case, the deformation-based Damage Criterion might not be able to give an accurate indication of local Damage of a structural component. In this paper, a new Damage Criterion for RC column is defined based on the residual axial load-carrying capacity. A numerical method to generate pressure–impulse diagram for RC column is proposed. Parametric studies are carried out to investigate the effects of column dimension, concrete strength, longitudinal and transverse reinforcement ratio on the pressure–impulse diagram. Based on the numerical results, analytical formulae to predict the pressure–impulse diagram for RC column are derived. A case study shows that the proposed analytical formulae can be easily used to generate pressure–impulse diagram for RC columns accurately. The results are also compared with those obtained from the SDOF approach. It is shown that the proposed method gives better prediction of pressure–impulse diagram than the SDOF approach.
Jérome Chevalier - One of the best experts on this subject based on the ideXlab platform.
-
Identification of a Damage Criterion of a highly porous alumina ceramic
Acta Materialia, 2016Co-Authors: Déborah Staub, Sylvain Meille, Vincent Le Corre, Loic Rouleau, Jérome ChevalierAbstract:This paper aims at identifying the multiaxial compression behavior of highly porous ceramics used as catalyst supports. For this purpose, instrumented spherical indentation tests are performed, together with uniaxial and hydrostatic compression tests. A transition from a brittle to a Damageable behavior with densification of the material is noted when increasing the triaxiality of the test. The collapse of large pores is shown as being responsible for the densification phenomenon, as confirmed by SEM and mercury intrusion porosimetry. A multiaxial Damage Criterion is proposed and identified thanks to a numerical finite element model. The results described in this paper coupled with a previous work (Staub et al., Oil and gas science and technology 2015, vol 70, n 3, 475e86) on the behavior of the same material under tension loading, allow for the first time to define a multiaxial Criterion both in tension and in compression for highly porous ceramics. These materials are shown to present a typical behavior of dense ceramics in tension, whereas in compression, their behavior is close to that of porous rocks.
-
Identification of a Damage Criterion of a highly porous alumina ceramic
Acta Materialia, 2016Co-Authors: Déborah Staub, Sylvain Meille, Vincent Le Corre, Loic Rouleau, Jérome ChevalierAbstract:Abstract This paper aims at identifying the multiaxial compression behavior of highly porous ceramics used as catalyst supports. For this purpose, instrumented spherical indentation tests are performed, together with uniaxial and hydrostatic compression tests. A transition from a brittle to a Damageable behavior with densification of the material is noted when increasing the triaxiality of the test. The collapse of large pores is shown as being responsible for the densification phenomenon, as confirmed by SEM and mercury intrusion porosimetry. A multiaxial Damage Criterion is proposed and identified thanks to a numerical finite element model. The results described in this paper coupled with a previous work (Staub et al., Oil and gas science and technology 2015, vol 70, n° 3, 475–86) on the behavior of the same material under tension loading, allow for the first time to define a multiaxial Criterion both in tension and in compression for highly porous ceramics. These materials are shown to present a typical behavior of dense ceramics in tension, whereas in compression, their behavior is close to that of porous rocks.
Déborah Staub - One of the best experts on this subject based on the ideXlab platform.
-
Identification of a Damage Criterion of a highly porous alumina ceramic
Acta Materialia, 2016Co-Authors: Déborah Staub, Sylvain Meille, Vincent Le Corre, Loic Rouleau, Jérome ChevalierAbstract:This paper aims at identifying the multiaxial compression behavior of highly porous ceramics used as catalyst supports. For this purpose, instrumented spherical indentation tests are performed, together with uniaxial and hydrostatic compression tests. A transition from a brittle to a Damageable behavior with densification of the material is noted when increasing the triaxiality of the test. The collapse of large pores is shown as being responsible for the densification phenomenon, as confirmed by SEM and mercury intrusion porosimetry. A multiaxial Damage Criterion is proposed and identified thanks to a numerical finite element model. The results described in this paper coupled with a previous work (Staub et al., Oil and gas science and technology 2015, vol 70, n 3, 475e86) on the behavior of the same material under tension loading, allow for the first time to define a multiaxial Criterion both in tension and in compression for highly porous ceramics. These materials are shown to present a typical behavior of dense ceramics in tension, whereas in compression, their behavior is close to that of porous rocks.
-
Identification of a Damage Criterion of a highly porous alumina ceramic
Acta Materialia, 2016Co-Authors: Déborah Staub, Sylvain Meille, Vincent Le Corre, Loic Rouleau, Jérome ChevalierAbstract:Abstract This paper aims at identifying the multiaxial compression behavior of highly porous ceramics used as catalyst supports. For this purpose, instrumented spherical indentation tests are performed, together with uniaxial and hydrostatic compression tests. A transition from a brittle to a Damageable behavior with densification of the material is noted when increasing the triaxiality of the test. The collapse of large pores is shown as being responsible for the densification phenomenon, as confirmed by SEM and mercury intrusion porosimetry. A multiaxial Damage Criterion is proposed and identified thanks to a numerical finite element model. The results described in this paper coupled with a previous work (Staub et al., Oil and gas science and technology 2015, vol 70, n° 3, 475–86) on the behavior of the same material under tension loading, allow for the first time to define a multiaxial Criterion both in tension and in compression for highly porous ceramics. These materials are shown to present a typical behavior of dense ceramics in tension, whereas in compression, their behavior is close to that of porous rocks.
