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Cohesive material zone model and ABAQUS subroutines

Submitted by Angelos Irakleidis on
research
ABAQUS
cohesive zone model
compression
Shear
mohr-coulomb
user-subroutines

Hello,

I'd like to ask if anybody knows if it is possible to use an ABAQUS usersubroutine that could vary some parameters (τmax, kn or ks etc) of the cohesive zone model of ABAQUS with the vertical pressure applied on the interface. The new ability of ABAQUS to support cohesive behaviour in contact surfaces seems very interesting and useful, however how could somebody simulate the interface under a compression - shear regime that may follow a Mohr-Coulomb type behaviour?

In-surface Buckling of Silicon Nanowires on Elastomeric Substrates

Submitted by Jianliang Xiao on
research
buckling
mechanics
nanowire

Buckling of thin layers or aligned arrays of stiff materials on elastomeric substrates has many important applications, such as stretchable electronics, precision metrology and flexible optoelectronics.  These systems show one common phenomenon, the stiff thin layers buckle normal to the substrate surface (out-of-surface buckling).  By contrast, we recently reported for the first time that silicon nanowires (SiNWs) on elastomeric substrates buckle only within the substrate surface, i.e. in-surface buckling.  Experimental process to obtain buckled SiNWs is described.

Aerodynamics of Flapping Wings for Biomimetic Flying Devices

Submitted by ADINA Support on
research
Aerodynamics
robotics
Fluid Structure Interaction
micro air vehicle
flapping wing
biomimetic
adaptive mesh

We present an interesting application of ADINA FSI in the

analysis of biomimetic flying devices. Please see

http://www.adina.com/newsgH62.shtml

You can find many other examples of applications of ADINA in the

analysis of multiphysics problems here:

http://www.adina.com/multiphysics.shtml

[Newton-Raphson Iteration in Transient Thermal Analysis

Submitted by shrimad on
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iterations
Transient
Newton Raphson

Hi,



I have been quite confused about this for sometime now. It
has not been mentioned clearly in the books/references that I have
looked into.



In transient thermal analysis with implicit scheme
or the Crank Nicolson scheme, are there Newton Raphson iterations based
on the residual vector in every time-step?







Thanks,

Shriram

--

Process Engineer

Moore Nanotechnology Systems

Keene, NH - 03431

Damage modeling in ABAQUS 6.9 in surface based cohesive behavior

Submitted by munish_khullar on
research
ABAQUS
Surface based cohesive behavior

I am working on shear failure of sandwich composites.I have modelled a sandwich composite with surface based cohesive behavior in ABAQUS 6.9.Now i have to do damage modelling. For damage initiation i have to describe values of 'peak values of contact stress' or 'peak values of contact separation'.In addn i also have to describe values of 'critical fracture energy' for damage evolution. I don't know how to find these values or where from i will get these values.

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