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Traction separation laws in Cohesive zone models - Some Questions

Submitted by yoursdhruly on
education
fracture
opinion
cohesive zone model

Hello! 

As a student who has spent a lot of time studying cohesive zone models in fracture mechanics, I have several questions that have bothered me over the past year or so, and I have not been able to find suitable answers to them. I am limiting myself here to questions related to the traction-separation law, which invariably forms the basis of CZM as it is implemented today. I am raising these questions in the hope that I can receive some response here, even if it means my question is invalid (as I suspect a few may be).  So here is my list:

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NYT most popular article in December features MIT physics professor

Submitted by Teng Li on
education
Internet

At 71, Physics Professor Is a Web Star

Most frequently e-mailed by NYTimes.com readers in the past 30 days, the above article features MIT physics professor, Walter H. G. Lewin, on how his free physics lecture videos online have won him devotees all over the world.

developing a Matlab software to get the natural frequency , and dynamic parameters (modal shape for each mode)

Submitted by sherifgebaly on
education

i am trying to develop a matlab program to calculate the natural frequency anf the model shapes for beams

using the finite element method , as i will need to change the stiffness in the beam sections to model cracks.

 i am sure there an easy ready method to perform this , i am happy if some one provided me with the method or the basic code

 

Significance of J1 and J2

Submitted by Ashar Sultan on
Forums
Materials Forum
Choose a channel featured in the header of iMechanica
education

Dear members,

I need some information about the implication or significance of J1 and J2 in granular materials not mathematical represantation which I have.Your feedback will be highly appreciated.Thanks in advance.

 

P = Mean stress or Hydrostatic stress = (σ11 + σ22+ σ33)/3

 

J1 = -3 * p

GRE Verbal, how much does it count?

Submitted by Temesgen Markos on
education

I am in the process of applying for a PhD in computational solid mechanics in the US and I am about to take the GRE. Well I have been kind of busy at my work and didn't really get time to study the word list.

My question is, how much weight does the verbal part have in admission/fellowship/assistantship decisions? If I have really good GPA's and research experience with enthusiastic refrees, can I still make it with medicore results on the verbal part?

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