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Fracture energies and strengths of cohesive layer

Submitted by Anonymous (not verified) on

Dear Friends,

I am working on damage prediction and cohesive zone modeling. I am looking for fracture energies and strengths for  the cohesive layer. We do not have facility for tests. Sometime back I have seen these property values in one paper but now it is missing. Can anyone tell me where I find the material property data for cohesive layer and lamina? Please suggest some literature in this regard.

Regards,

Praveen. 

 

Why rate equations in Nonlinear FE?

Submitted by ramdas chennamsetti on

Hi all!

I have a very fundamental question as follwing.

In Nonlinear FE formulations, we use rate equations (virtual work), but, in linear FE we don't use rate equations. Why???

Is it because Nonlinear solution is iterative solution (time may be virtual time).

I request those who have an idea to give some explanations.

Thanks in advance,

Regards,

- Ramdas

 

ES 240 Homework 16

Submitted by Sung Hoon Kang on

* Title of the post: Theory of Elasticity by S.P. Timoshenko and J.N. Goodier

 

 

* If there are already helpful reviews of the book online, please make a hyperlink in your

post to the web page of the review. (http://www.amazon.com/review/product/0070858055/ref=dp_db_cm_cr_acr_txt…)

 

* Outline the content of the book.

Chapter 1. Introduction

Decomposition of the displacement gradient into elastic and plastic parts

Submitted by Kamyar M Davoudi on

We know that total strain is the symmetric part of the displacement gradient. Total strain can be represented by the sum of the elastic and plastic (eigen) strains. Let consider a dislocation in an arbitrary solid. Suppose we computed the displacement filed, therefore the total strain can be obtained immediately. What are the criteria for the decomposition of the total strain into elastic and plastic parts?