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Freely jointed chain

Submitted by Zhigang Suo on

A single strand of polymer is a chain of a large number of monomers.  The monomers are joined by covalent bonds, and two bonded monomers may rotate relative to each other.  At a finite temperature, the polymer rapidly changes from one configuration to another.  When the two ends of the polymer are pulled by a force, the distance between the two ends changes.  The polymer is known as an entropic spring.

Fracture using cohesive elements

Submitted by yashaswi.prateek on

Hi everyone , 

I'm Yashaswi Prateek  doing by final year project on fracture in composites using ABAQUS. I'm new to ABAQUS and have been trying to do some tutorials to get a better understanding of the software. After basic tutorials , i've started trying to generate a model using cohesive elements where i got stuck up. I have tried the procedure in Abaqus user manual and is showing some errors regarding interaction properties and creating a step.  It would be great help if someone could help me regarding how to model with cohesive elements.

Report from NBC Learn on Epidermal Electronics

Submitted by Jizhou Song on

Here is the report from NBC Learn, the education arm of NBC, about Profs. John Rogers and Yonggang Huang's work on epidermal electronics.

http://www.nbclearn.com/portal/site/learn/cuecard/62961

(You can press control+click to open it, or copy the above weblink to a browser) 

Elasticity of rubber-like materials

Submitted by Zhigang Suo on

In the notes on the general theory of finite deformation, we have left the free energy function unspecified. The notes here describe free energy function commonly used to describe the elasticity of rubber-like materials.  These notes are part of a course on advanced elasticity

Abaqus cohesive elements/cohesive surface

Submitted by StevenS on
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For my
graduation project I’m working on a model to describe cracking behavior. For
this model I want to model a fibre-epoxy interface, see the attached figure 1
(due to symmetry only a quarter is modeled). The fibre part is modeled with
lineair elastic material. The epoxy part is modeled with CPS4 elements, with
elastic behavior and MAXPS damage (damaged evolution included). The connection
between the fibre and epoxy interface can be modeled with both a cohesive
surface and cohesive elements.  However

Cohesive elements wont break

Submitted by Gorjin on
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Hi!

My name is Christian and Im having big problems whit geting my cohesive elements to break. I have been stuck for some time now and cant find the right help. Im not experienced whit abaqus so its probably a very simple fault but I cant find it.

Elastocapillarity

Submitted by Zhigang Suo on

These notes are part of a course on advanced elasticity.  The notes recall several phenomena where both elasticity and surface energy are significant, including

  • Griffith crack
  • Adhesion of flexible structures
  • Wafer bonding
  • Contraction of a soft elastic sheet 

The notes also contain a formulation of combined surface energy and elasticity of finite deformation.