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Abaqus, element removal

Submitted by Hossein on

Hi everybody,

 is there anyone who is familiar with element deletion or removal to predict crackopening in RC member model in ABAQUS?

I've made a 2D model of RC beam in abaquse with brittle cack properties and brittle failure but I could not get any result. Can I make my model by concrete damage plasticity and using abaqus standard to apply element removal?

I will really appreciate anyone who helps me to solve my problem.

 Thanks in advance

Dynamics of AFM cantilevers

Submitted by venapa on

Hi everyone,

I am looking for papers on the dynamics of AFM cantilevers in contact with non linear material samples. In particular, I am interested in forced armonic vibrations of the catinlevers.

I have seen many papers on intermittent contact (or tapping) which has a number of additional problems w.r.t. the contact mode.

Many thanks for the help.

Pasquale V.

Element remoal

Submitted by Hossein on

Hi

I am intending to make a concrete member model to investigate crack opening in tension zone. First, I wanted to use crack propagation model and could not get good result. So, I think that I can do it by using stress/strain principal failure and element removal.

I've tried to fiure out how I can apply this method in my model.

Is there enyone who has experience in this issue? Could you please help me in this matter?

 

Notch stress distributions

Submitted by michele.zappal… on

Dear all,

this is for all people interested in notch analyses. 

In the links below you can find some recent works of mine about linear and nonlinear stress distributions for different kind of notches under torsion.

Hope they will be useful to someone:

http://www.springerlink.com/content/5v536n0026v42586/?p=e7c8da446d524e7…

Slope of The Non Linear Stress Strain Curve at Proof Stress

Submitted by asit_rathod1 on

Dear All

Hi..

Can Any body tell Me The calculation of the E_t Tangent And E_s Secant Modules VAlues of the Stress Strain curve?...

i had go through some of graphs but i dont get it?..it will be help ful to understanfd the E_t And E_s?..

i had values of Stress and Strain and also a Stress strain curve available..

Plz do need ful..

 

Finalists for 2010 Robert J. Melosh Medal Competition Announced

Submitted by John E. Dolbow on

Seven finalists and three honorable mentions have been announced for the Twenty-Second Annual Robert J. Melosh Competition for the Best Student Paper in Finite Element Analysis. The seven finalists and their current institutions are:

Marcial Gonzalez, Caltech

Ming-Chen Hsu, University of California San Diego

Alejandro Ortiz, University of California Davis

Jay Oswald, Northwestern University

Rashmi Raghu, Stanford University

Phanish Suryanarayana, Caltech

membrane locking and CST trangle

Submitted by Alessio on

I often read on books that linear triangles do not have membrane locking for large deformations of plates/shells. I completely don't understand how this is possible. If one uses the well-known CST, stretching is measured as the increase in lenght of each edge of the triangle. Then, in the limit of the membrane stiffness going to infinity, clearly the solution cannot approximate any bending-dominated state, but rather it will be always rigid on general meshes (i.e. Minkowski theorem for convex bodies), allowing at most bending about few lines on very regular ones. What am I missing?

Structure of Defective Crystals at Finite Temperatures: A Quasi-Harmonic Lattice Dynamics Approach

Submitted by arash_yavari on

In this paper we extend the classical method of lattice dynamics to defective crystals with partial symmetries. We start by a nominal defect configuration and first relax it statically. Having the static equilibrium configuration, we use a quasiharmonic lattice dynamics approach to approximate the free energy. Finally, the defect structure at a finite temperature is obtained by minimizing the approximate Helmholtz free energy. For higher temperatures we take the relaxed configuration at a lower temperature as the reference configuration.