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Surface Based Fluid Cavities, and inflators

Submitted by Nathan Hayes on
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ABAQUS
Fluid
cavity
gas
inflate
inflatable
reference mesh

I've been tasked with creating a 3D model of a demo inflatable
structure here in our lab. The goal is to inflate it in ABAQUS, and I
have been making some progress in using the *FLUID CAVITY keyword.
However I'm noticing odd things in my results. I have the pressure of
the gas increase to 4psi in a tabular form, however as I watch the
frame by frame, the stress concentrations on the structure vary oddly,
and the model deforms oddly. Almost as if it was a ball being pressed
back and forth against the floor, expand contract, that kind of deal.

Postdoctoral Fellow in Computational Mechanics

Submitted by John E. Dolbow on
job
dynamic fracture
finite elements
high-performance computing

A postdoctoral fellowship is available in the Duke Computational Mechanics Laboratory, beginning in September of 2009 (with flexibility on timing).  Funding for the fellowship concerns research in the simulation of large-scale fragmentation phenomena.  The ideal candidate will have experience in some combination of the following areas:

Formation of creases on the surfaces of elastomers and gels

Submitted by Wei Hong on
research
suo group research
instability
gel
hong group research
crease

When a block of an elastomer is bent, the compressed surface may form a crease. This paper analyzes the critical condition for creasing by comparing the elastic energy in a creased body and that in a smooth body. This difference in energy is expressed by a scaling relation. Critical conditions for creasing are determined for elastomers subject to general loads and gels swelling under constraint. The theoretical results are compared with existing experimental observations.

Spectral decomposition

Submitted by WaiChing Sun on
research
spectral decomposition
spectral form

Dear all,

     Many numerical implementation of plasticity model uses spectral decomposition to represent the Cauchy stress, elastic strain,  such that stress update algorithm is written in the principal directions. As a result, I wonder what makes it benefical to write the stress update algorithm in spectral form? 

 Thanks,

WaiChing Sun

 

NRC Research Fellowship Opportunity at Duke University

Submitted by John E. Dolbow on
job
computational mechanics
NRC
research opportunity

Researchers at Duke University are seeking applications for NRC research associates, to work with Professors David Stepp and John Dolbow.  The NRC program is unique in the sense that applicants have the opportunity to perform research on a program they design.  The positions are well-paid fellowships and are nominally for two years, extendable to a third.  

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