# fracture

## 17 th National Congress on Theoretical and Applied Mechanics June 15-20 (Michigan State University)

Dear all,

I would like to bring to your attention the following minisymposium that is organized as part of the NCTAM 17 (Michigan State University, June 15-20, 2014)

Friction, Adhesion and Fracture: From microscale physics to macroscale response

## ESIS TC4 2014 - Abstract deadline reminder: 25 October 2013

7th International Conference on Fracture of Polymers, Composites and Adhesives - 14-18 September 2014, Eurotel Victoria, Les Diablerets, Switzerland

We are looking for both experimetal and analytical work, in order to give a balanced view of the subject areas:
- Polymers
- Application of fracture mechanics
- Composites

## Conducting crack propagation driven by electric fields in ferroelectric ceramics

This is a recent article in Acta Materialia on the propagation of conducting cracks in ferroelectric ceramics

Title: Conducting crack propagation driven by electric fields in ferroelectric ceramics

Authors: Amir Abdollahi and Irene Arias, Universitat Politecnica de Catalunya (UPC), Barcelona

Abstract:

## Use Vumat to simulate the hot ductile fracture criterion of Freudenthal

Dear everybody，
I have just studied Abaqus and would like to use Vumat to simulate the hot ductile

fracture criterion of Freudenthal which have the equation: D=integral(0-fracture strain)

of (Smises stress)*d(strain). The fracture will be appear when I reach 1 unit.
Could you please show me how to write algorithm adding temperature to calculate (D) and

out put (D) in Vumat.

thanks you so much

I am looking forward to hearing from you

hongfengtl

## Why not Gurson-Tvergaard-Needleman void growth model for plate impact simulations?

Can someone answer me if Gurson-Tvergaard-Needleman void growth model is not suitable for flyer-plate impact simulations? I have come across some papers who have derived void growth equations to simulate fracture in ductile mateials like OFHC copper etc., subject to plate impact (uniaxial strain high strian rate loading). I have attached 3 of them. But none of them have used Gurson's yield function. I did not find any explanation if GTN model has any drawbacks in simulating spallation phenomena found in plate impact simulations.

## polymer fracture in ansys/abaqus

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Can any one tel how to simulate numericall and analytically fracture in polymers?

## characteristic Length

Hi

is there a way to get the characteristic length of one element? I wanna calculate xult (when the element is cracked, fracutred..).

I use the concrete damage plasticity model and after reaching the tensile strength i assume a linear softening with fracture energy.

Input are:

Young´s modulus

max. tensile strength

fracture energy

Outpu:

when do i reach xult or what is the plastic strain equivalent