Rex Bedzra

Rex Bedzra
Bergische Universität Wuppertal | Uni-Wuppertal, BUW · Faculty of Architecture, Civil, Mechanical and Safety Engineering

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8
Publications
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40
Citations

Publications

Publications (8)
Article
A main problem for the development of comprehensive continuum mechanical models is the lack of experimental data. To overcome this problem, a non-associative viscoelastic-viscoplastic constitutive model which takes into account combined isotropic-kinematic hardening effects for epoxy matrix as well as a three dimensional non-associative anisotropic...
Article
A new approach for the systematic development of constitutive models for composites is proposed. The approach relies on the generation of a representative volume element of the composite microstructure, which in this case is a flax fibre/epoxy matrix unidirectional composite. The microstructure is subjected to different deformation states based on...
Article
In this paper, a three-dimensional anisotropic multi-surface model for the in-plane elastoplastic deformation of paper and paperboard is developed. The model is based on the concept of structural tensors. It employs three different yield functions and parameterised consistency conditions for three different loading scenarios. The evolution of the y...
Chapter
This contribution describes a scale bridging approach for modelling pressure independent elastoplastic unidirectional metallic composite materials by making use of an anisotropic elastoplastic constitutive model. The material under investigation is tungsten fiber reinforced copper (W/Cu) composite. To identify the yield surface of the composite, a...
Article
In this paper, a scale bridging approach for modelling unidirectional tungsten fibre reinforced copper (W/Cu) composite by making use of an anisotropic elastoplastic constitutive model is described. To identify the yield surface of the composite and to further validate the constitutive model, a finite element model of a unit cell (UC) of the compos...
Article
This paper discusses a rate-independent elastoplastic constitutive model for fibre reinforced composite materials. The type of composite material considered here is tungsten fibre reinforced copper (W/Cu). The constitutive framework is based on multisurface plasticity and is derived in a thermodynamically consistent manner. Plastic anisotropy is mo...
Article
Fiber reinforced plastics such as carbon fiber-reinforced composites are typically characterized by their high siffness to weight ratio making them particularly attractive in lightweight construction. In addition, the architecture of these materials means that the correct modelling of their orthotropy is very important. In this work, volume average...

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