Blog posts

RVE analysis becomes a routine exercise in material modeling. Usually it is carried out using finite element codes such as ABAQUS or ANSYS. The main thing one should pay attention is to applying the right boundary conditions. It is settled that periodic boundary conditions are the preferred boundary conditions to be applied. The BCs are that u_i-\epsilon_{ij}x_j should be equal on the corresponding edges. This type of boundary conditions can be applied using coupled equations constraints. This requires that one creates a mesh with corresponding nodes on periodic edges.

The effects of blast loading on structures can be very dangerous: damages and failures are expected with serious threats to structural safety and human life. Materials stresses and strains are often pushed to the limit and the modelling of these phenomena can be very complex. In order to design blast-resistant structures it is very important to determine what are the key parameters of this problem.

A finite element framework for distortion gradient plasticity with applications to bending of thin foils

Emilio Martínez-Pañeda, Christian F. Niordson, Lorenzo Bardella

International Journal of Solids and Structures

http://www.sciencedirect.com/science/article/pii/S0020768316301081

(A pre-print version is available at www.empaneda.com)

Dear all,

Currently I am engaged in solving a geological problem. So we have some soil model in the form of disk, there is a circular hole in the center, which has the initial pressure at the reference time  (a modelling of the soil injection with the polymer compound)

Dear members of imechanica,

Does anyone have any exprience in phase filed modeling of phase transformation in comsol? To be more specific, I would like to know if it is possible to solve the field equation and diffusion equation at the same time using Comsol PDE module or any other module?

I know that there are phase field modules for liquid/solid intractions in Comsol. However, what I intend to do is phase transformation or solidification.

Thanks in advance.

Hi,

I am working in rubber. Since this is hyperelastic material, I seriously doubt whether I can use the relation E=2G*(1+nu) which is valid for metals.

Is there any relation for rubber as such? Can anyone give me a direction on how to get the relation between these two?

Thanks in advance! 

Applications are accepted for a postdoctoral research associate position at Center for Risk and Reliability, Department of Mechanical Engineering, University of Maryland, College Park, MD, USA.

The definition of the size of the Representative Volume Element (RVE) is extremely important for the mechanics and physics of heterogeneous materials since it should statistically represent the micro-structure of the material. In the present contribution, a methodology based on statistical analysis and numerical experiments is proposed to determine the size of the RVE for heterogeneous amorphous polymers subjected to finite deformations.