computational homogenization
Sutured tendon repair; a multi-scale finite element model.
We've recently published an open access journal paper that looks at the mechanics of sutures used to repair severed tendons. A homogenization strategy is used to derive effective elastic properties for tendon fibrils and intracellular matrix. We have found that regions of high stress correlate with the regions of cell death (necrosis) that are sometimes observed in patients.
If this is of interest, please feel free to view the paper here.
Homogenization - If materials in the model are isotropic, is it possible to get truly anisotropic resulting material?
Hello,
I read that "In general, even if the materials on the micro-level are isotropic, the effective
material can show anisotropic behavior. A general anisotropic linear elastic material
may have twenty one independent material parameters.''
If I understand my results correctly then simple structures like ''ball in the unit cell'' result in orthotropic material.
I am a bit puzzled - what would be the simplest structure that would result in anisotropic material behaviour?
Two PhD positions on experimental and computational multiscale mechanics at Eindhoven University of Technology, the Netherlands
Our Mechanics of Materials Group at Eindhoven University of Technology, the Netherlands has two openings for talented PhD students in the field of multiscale mechanics of materials. They are part of a European Union funded project on multiscale methods for advanced materials. One opening is on the development of a fundamentally new multiscale approach towards material modelling and the other aims to integrate this approach with experimental methods.
USNCCM 2013, Raleigh, USA: MS on Multiscale computational homogenization
You are welcome to submit abstracts to the MS 4.5 "Multiscale Computational homogenization for bridging scales in the mechanics and physics of complex materials", organized by P. Wriggers, K. Terada, V. Kouznetsova, M. Cho and myself at the 12th US National Congress on Computation Mechanics (USNCCM), July 22-25, 2013, in Raleigh, USA.
The deadline fo abstract submission is February 15, 2013.
The topics of the MS can be found here:
Computational homogenization of linear viscoelastic materials: a simplified approach
Several methods have been proposed for numerical homogeniation of linear viscoelastic materials, mainly based on Laplace transform or on multilevel (FE^2) approaches. In this paper, we introduce a much simpler technique based on a discrete representation of the effective relaxation tensor related to the homogeneous medium, which can then be used to evaluate the constitutive law in the form of a convolution product. In practice, calculations on the RVE reduce to 3 transient simulations in 2D and 6 in 3D. More details in