The Experts below are selected from a list of 156657 Experts worldwide ranked by ideXlab platform
Jan Heijne - One of the best experts on this subject based on the ideXlab platform.
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work hardening Descriptions in simulation of sheet metal forming tailored to Material type and processing
International Journal of Plasticity, 2016Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributes to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Physically based hardening Descriptions are used for reliable extensions to high strain values.
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Tailored Work Hardening Descriptions in Simulation of Sheet Metal Forming
2013Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributed to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Therefore, physically based hardening Descriptions are neede...
Henk Vegter - One of the best experts on this subject based on the ideXlab platform.
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work hardening Descriptions in simulation of sheet metal forming tailored to Material type and processing
International Journal of Plasticity, 2016Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributes to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Physically based hardening Descriptions are used for reliable extensions to high strain values.
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Tailored Work Hardening Descriptions in Simulation of Sheet Metal Forming
2013Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributed to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Therefore, physically based hardening Descriptions are neede...
Adnan Ibrahimbegovic - One of the best experts on this subject based on the ideXlab platform.
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Finite elastoplastic deformation of membrane shells
Engineering Computations, 1996Co-Authors: Adnan IbrahimbegovicAbstract:Under restriction of an isotropic elastic response of deformed lattice, develops a covariant theory of finite elastoplasticity in principal axes of a pair of deformation tensors. In Material Description, the tensor pair consists of the plastic deformation tensor and the total deformation Cauchy‐Green tensor. Applies the proposed theory to elastoplastic membrane shells, whose references and current configurations can be arbitrary space‐curved surfaces. Pressure‐insensitive von Mises yield criterion with isotropic hardening and a quadratic form of the strain energy function given in terms of elastic principal stretches are considered as a model problem. Through an explicit enforcement of the plane stress condition we arrive at a reduced two‐dimensional problem representation, which is set in the membrane tangent plane. Numerical implementation of the presented theory relies crucially on the operator split methodology to simplify the state update computation. Presents a set of numerical examples in order to ...
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Finite elastoplastic deformations of space-curved membranes
Computer Methods in Applied Mechanics and Engineering, 1994Co-Authors: Adnan IbrahimbegovicAbstract:Abstract Under restriction of an isotropic elastic response of deformed lattice, a covariant theory of finite elastoplasticity is developed in principal axes of a pair of deformation tensors. In Material Description, the tensor pair consists of the plastic deformation tensor and the total deformation Cauchy-Green tensor. The proposed theory is applied to elastoplastic membranes, whose reference and current configurations can be arbitrary space-curved surfaces. Pressure-insensitive von Mises yield criterion and isotropic hardening are considered as a model problem. With a particular form of the strain energy function, given in terms of elastic principal stretches, through an explicit enforcement of the plane stress condition we arrive at a reduced two-dimensional problem representation, which is set in the membrane tangent plane. Numerical implementation details are given to show an important role of the operator split methodology in simplifying the state update computation and the computation of the consistent tangent modulus. A set of numerical examples illustrates the performance of the presented theory and indicates some of the possible areas of application.
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Equivalent spatial and Material Descriptions of finite deformation elastoplasticity in principal axes
International Journal of Solids and Structures, 1994Co-Authors: Adnan IbrahimbegovicAbstract:Abstract A spatial Description of the theory of rate-independent finite deformation elastoplasticity, in which the stress tensor is defined through the strain energy function, is discussed. The main assumption of isotropic elastic response and invariance requirements under superposed rigid body motion restrict the acceptable forms of the strain energy function to those given in terms of principal values of the strain measure of elastic distortion. The formulation is developed on a manifold and the corresponding Material Description is obtained simply by pull-back of the derived spatial form, by appealing to the notion of covariance. The method of principal axes is systematically exploited to derive the explicit expression for the stress tensor computation for an arbitrary form of the strain energy function and the explicit form of the evolution equation for an arbitrary form of the yield function. A model problem of volume-preserving plastic flow is discussed in the closure.
Hermann G. Matthies - One of the best experts on this subject based on the ideXlab platform.
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Variational Theory and Computations in Stochastic Plasticity
Archives of Computational Methods in Engineering, 2015Co-Authors: Bojana V. Rosić, Hermann G. MatthiesAbstract:In this paper the irreversible behaviour of solids and structures in terms of rate-independent elastoplastic constitutive models in the presence of uncertainty in both Material Description and loading is studied. The mathematical background in convex analysis of deterministic elastoplasticity is extended to the stochastic domain, and numerical algorithms are formulated and explored. Computationally these problems—in analogy to the deterministic closest point return map—lead to the stochastic minimisation of a convex energy functional on tensor product spaces. The Material parameters describing the problem are modelled as tensor-valued random fields whose numerical representation can be achieved in different ways, such as sampling, or with functional approximations using the Karhunen–Loève and polynomial chaos expansions. Various numerical solution strategies such as direct integration, stochastic Galerkin and collocation approaches are formulated, discussed, and compared on computational examples.
Hans Mulder - One of the best experts on this subject based on the ideXlab platform.
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work hardening Descriptions in simulation of sheet metal forming tailored to Material type and processing
International Journal of Plasticity, 2016Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributes to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Physically based hardening Descriptions are used for reliable extensions to high strain values.
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Tailored Work Hardening Descriptions in Simulation of Sheet Metal Forming
2013Co-Authors: Henk Vegter, Hans Mulder, Peter Van Liempt, Jan HeijneAbstract:In the previous decades much attention has been given on an accurate Material Description, especially for simulations at the design stage of new models in the automotive industry. Improvements lead to shorter design times and a better tailored use of Material. It also contributed to the design and optimization of new Materials. The current Description of plastic Material behaviour in simulation models of sheet metal forming is covered by a hardening curve and a yield surface. In this paper the focus will be on modelling of work hardening for advanced high strength steels considering the requirements of present applications. Nowadays work hardening models need to include the effect of hard phases in a soft matrix and the effect of strain rate and temperature on work hardening. Most Material tests to characterize work hardening are only applicable to low strains whereas many practical applications require hardening data at relatively high strains. Therefore, physically based hardening Descriptions are neede...