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Giant voltage-induced deformation in dielectric elastomers near the verge of snap-through instability

Submitted by Tiefeng Li on
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suo group research
bauer group research
yang group research

     Dielectric elastomers are capable of large voltage-induced deformation, but achieving
such large deformation in practice has been a major challenge due to electromechanical
instability and electric breakdown. The complex nonlinear behavior suggests an important
opportunity: electromechanical instability can be harnessed to achieve giant voltage-induced
deformation. 

 

 

Jacobian matrix of Mooney-Rivlin model

Submitted by augustus on
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hyperelasticity
Nonlinear elasticity

Hi,

does anyone know where I can find the analytical expressions for the components

of the Jacobian matrix of the Mooney-Rivlin model.

I know the compact form of the matrix, with the tensor products, deviators etc,

but I'm looking for the explicit expressions of each component of the matrix.

 

many thanks!

 

 

 

Penetration problem in Abaqus

Submitted by Sanhitadas12 on
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Fracture Mechanics Forum
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I have been trying to model the penetration of a thin metal plate by a flat cylindrical bullet in ABAQUS. The plate has been treated as a membrane, and I am using Johnson-Cook's damage model in conjunction with Johnson-Cook hardening. The bullet is deforming the plate and travelling to the opposite side of the plate. But the dent is becoming infinitely long, but not showing any signs of ductile failure. What could have probably gone worng?

I have funds for someone to visit me at The University of Chile

Submitted by Alejandro Orti… on
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I have funds for someone to come for a short visit (one to two weeks) to the University of Chile. You are eligible if:

a) You hold a Ph.D in Civil Engg, Mechanical Engg, Material Science, Mathematics or closely related field.

b) You currently work at any University, Research lab or similar.

c) One of your research areas is meshfree or finite element methods (including xfem and isogeometric analysis) for solid mechanics (preferably nonlinear).

d) You are able to come here before this October 31th.

In Abaqus, how to get SSE in UMAT?

Submitted by yw5aj on
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ABAQUS
UMAT

Hi all,

 

I have been writing a UMAT function with modified hyper-visco-elastic model. My question is: after I got the Cauchy stress at the end of step, how do I get the SSE （elastic strain energy density)?

 

If it is only hyper-elastic I would have known (since the strain energy function itself is given). However, if it is viscoelastic, how should I calculate?

 

PS: I would also appreciate it if anyone could shed some light in getting SPD, SCD as well. Thanks a lot!

 

-Shawn

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