The Experts below are selected from a list of 3168 Experts worldwide ranked by ideXlab platform
Wim Van Paepegem - One of the best experts on this subject based on the ideXlab platform.
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consistent application of periodic boundary conditions in implicit and explicit finite element simulations of damage in composites
Composites Part B-engineering, 2019Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:Abstract This paper presents an implementation-dedicated analysis of Periodic Boundary Conditions (PBCs) for Finite Element (FE) models incorporating highly non-linear effects due to plasticity and damage. This research addresses fiber-reinforced composite materials modeled at micros-scale level using a Representative Volume Element (RVE), where its overall mechanical response is obtained via homogenization techniques. For the sake of clearness, a Unidirectional Ply with randomly distributed fibers RVE model is assumed. PBCs are implemented for implicit and explicit FE solvers, where conformal and non-conformal meshes can be used. The influence of apPlying PBCs in the reliability of the mechanical response under tension and shear loading is assessed. Furthermore, the Poisson effect and the consistency of damage and fiber debonding propagation through the periodic boundaries are reported as well as their impact on the homogenized results. Likewise, numerical aspects like computational performance and accuracy are evaluated comparing implicit- versus explicit-based solutions.
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material parameter identification of the elementary Ply damage mesomodel using virtual micro mechanical tests of a carbon fiber epoxy system
Composite Structures, 2017Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:A general multiscale hierarchical framework is proposed to identify the material parameters of a mesoscale model using numerical simulations based on virtual micro-mechanical tests. The identification of the material parameters is usually done with several experiments on different laminates. These experiments are replaced by virtual tests on a microscale finite element model with the same load conditions than the real experiments. The microscale model represents the Unidirectional Ply geometry based on its constituents, fibers and matrix, with their corresponding properties and the damage behavior of the matrix and interface between them. Under the defined load conditions, the homogenized stress-strain behavior of the laminates is obtained and then, the constitutive model parameters of the Ply damage mesomodel are identified. As an example, the proposed framework is applied to identify the material parameters of the elementary Ply damage mesomodel developed at LMT-Cachan. It is shown that, when the materials, geometry and load conditions are correctly defined in the micromodel, the real experiments can be replaced by virtual tests. As a result, the amount of experiments can be reduced saving costs and time. In addition, further studies can use the proposed methodology based on virtual micro-mechanical tests to improve the current mesoscale models.
F.x. Irisarri - One of the best experts on this subject based on the ideXlab platform.
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Determination of the longitudinal compressive strength of a CFRP Ply through a tensile test on a laminate
Composites Part A: Applied Science and Manufacturing, 2018Co-Authors: Frédéric Laurin, P. Paulmier, F.x. IrisarriAbstract:In this study, an innovative test is proposed to identify the longitudinal compressive strength of a Unidirectional Ply. The key idea consists in designing a laminate that, when subjected to a tensile loading, fails by compressive failure in its central 90°-Ply, due to the Poisson effect, without any prior damage. Six specimens have been tensile tested to failure. No intra-laminar matrix damage could be detected before the final failure. Fibre kinking in the 90°-Ply is observed experimentally in the failed specimens. This damage mechanism, located in the gauge section of the specimens, leads to the final failure. A fast computational identification method is used to determine the longitudinal compressive stress and strain within the 90-Ply at failure, from this specific tensile test. The identified average failure properties are consistent with those obtained through conventional compression tests, but the associated scattering is much lower. Consequently, this innovative method leads to an increase in the design allowable, resulting in higher performance designs.
D Garoz - One of the best experts on this subject based on the ideXlab platform.
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consistent application of periodic boundary conditions in implicit and explicit finite element simulations of damage in composites
Composites Part B-engineering, 2019Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:Abstract This paper presents an implementation-dedicated analysis of Periodic Boundary Conditions (PBCs) for Finite Element (FE) models incorporating highly non-linear effects due to plasticity and damage. This research addresses fiber-reinforced composite materials modeled at micros-scale level using a Representative Volume Element (RVE), where its overall mechanical response is obtained via homogenization techniques. For the sake of clearness, a Unidirectional Ply with randomly distributed fibers RVE model is assumed. PBCs are implemented for implicit and explicit FE solvers, where conformal and non-conformal meshes can be used. The influence of apPlying PBCs in the reliability of the mechanical response under tension and shear loading is assessed. Furthermore, the Poisson effect and the consistency of damage and fiber debonding propagation through the periodic boundaries are reported as well as their impact on the homogenized results. Likewise, numerical aspects like computational performance and accuracy are evaluated comparing implicit- versus explicit-based solutions.
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material parameter identification of the elementary Ply damage mesomodel using virtual micro mechanical tests of a carbon fiber epoxy system
Composite Structures, 2017Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:A general multiscale hierarchical framework is proposed to identify the material parameters of a mesoscale model using numerical simulations based on virtual micro-mechanical tests. The identification of the material parameters is usually done with several experiments on different laminates. These experiments are replaced by virtual tests on a microscale finite element model with the same load conditions than the real experiments. The microscale model represents the Unidirectional Ply geometry based on its constituents, fibers and matrix, with their corresponding properties and the damage behavior of the matrix and interface between them. Under the defined load conditions, the homogenized stress-strain behavior of the laminates is obtained and then, the constitutive model parameters of the Ply damage mesomodel are identified. As an example, the proposed framework is applied to identify the material parameters of the elementary Ply damage mesomodel developed at LMT-Cachan. It is shown that, when the materials, geometry and load conditions are correctly defined in the micromodel, the real experiments can be replaced by virtual tests. As a result, the amount of experiments can be reduced saving costs and time. In addition, further studies can use the proposed methodology based on virtual micro-mechanical tests to improve the current mesoscale models.
Frédéric Laurin - One of the best experts on this subject based on the ideXlab platform.
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Determination of the longitudinal compressive strength of a CFRP Ply through a tensile test on a laminate
Composites Part A: Applied Science and Manufacturing, 2018Co-Authors: Frédéric Laurin, P. Paulmier, F.x. IrisarriAbstract:In this study, an innovative test is proposed to identify the longitudinal compressive strength of a Unidirectional Ply. The key idea consists in designing a laminate that, when subjected to a tensile loading, fails by compressive failure in its central 90°-Ply, due to the Poisson effect, without any prior damage. Six specimens have been tensile tested to failure. No intra-laminar matrix damage could be detected before the final failure. Fibre kinking in the 90°-Ply is observed experimentally in the failed specimens. This damage mechanism, located in the gauge section of the specimens, leads to the final failure. A fast computational identification method is used to determine the longitudinal compressive stress and strain within the 90-Ply at failure, from this specific tensile test. The identified average failure properties are consistent with those obtained through conventional compression tests, but the associated scattering is much lower. Consequently, this innovative method leads to an increase in the design allowable, resulting in higher performance designs.
Siebe Spronk - One of the best experts on this subject based on the ideXlab platform.
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consistent application of periodic boundary conditions in implicit and explicit finite element simulations of damage in composites
Composites Part B-engineering, 2019Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:Abstract This paper presents an implementation-dedicated analysis of Periodic Boundary Conditions (PBCs) for Finite Element (FE) models incorporating highly non-linear effects due to plasticity and damage. This research addresses fiber-reinforced composite materials modeled at micros-scale level using a Representative Volume Element (RVE), where its overall mechanical response is obtained via homogenization techniques. For the sake of clearness, a Unidirectional Ply with randomly distributed fibers RVE model is assumed. PBCs are implemented for implicit and explicit FE solvers, where conformal and non-conformal meshes can be used. The influence of apPlying PBCs in the reliability of the mechanical response under tension and shear loading is assessed. Furthermore, the Poisson effect and the consistency of damage and fiber debonding propagation through the periodic boundaries are reported as well as their impact on the homogenized results. Likewise, numerical aspects like computational performance and accuracy are evaluated comparing implicit- versus explicit-based solutions.
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material parameter identification of the elementary Ply damage mesomodel using virtual micro mechanical tests of a carbon fiber epoxy system
Composite Structures, 2017Co-Authors: D Garoz, Ruben Sevenois, Siebe Spronk, F A Gilabert, Wim Van PaepegemAbstract:A general multiscale hierarchical framework is proposed to identify the material parameters of a mesoscale model using numerical simulations based on virtual micro-mechanical tests. The identification of the material parameters is usually done with several experiments on different laminates. These experiments are replaced by virtual tests on a microscale finite element model with the same load conditions than the real experiments. The microscale model represents the Unidirectional Ply geometry based on its constituents, fibers and matrix, with their corresponding properties and the damage behavior of the matrix and interface between them. Under the defined load conditions, the homogenized stress-strain behavior of the laminates is obtained and then, the constitutive model parameters of the Ply damage mesomodel are identified. As an example, the proposed framework is applied to identify the material parameters of the elementary Ply damage mesomodel developed at LMT-Cachan. It is shown that, when the materials, geometry and load conditions are correctly defined in the micromodel, the real experiments can be replaced by virtual tests. As a result, the amount of experiments can be reduced saving costs and time. In addition, further studies can use the proposed methodology based on virtual micro-mechanical tests to improve the current mesoscale models.
