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Dear all,



I want to do a frequency analysis of a 3d frame which has three beam elements (2 columns and one beam). There are no lumped masses in the model. I want to assign mass to all three elements equal to m per unit length of the members.



When I assigned nonzero density in the beam section definition (equal to m/A, where A is the cross section area),

When I changed from beam elements into frame elements

When I changed from beam of linear geometric order to beam of quadratic geometric order (standard element libraries)

Dear everyone,

Now, I am trying to write Abaqus user defined subroutine(UMAT) for Rousselier damage model, but I don’t know how to define the consistent tangent modulus (the Jacobain) for this model.

Could anyone please give me some information or suggest to me how to determine the equation of this term (Jacobian) ?

Thank you very much indeed

Sutham A.  

I'm modeling rock fracture problem with cohesive element. I konw the propertiey of the solid element around the fracture because we can measure it (rock sample) in the lab. but as regard to how to define the propeties of cohesive element, I'm completely lost.



in fact, the cohseive element is a fictitious one, not a real matearial in the physical world, we can't mearsure its propety by physical means. then how can we know what parameters we should enter ?



need your help, thanks

How to model SMA wire embeded in composite beam using Abaqus using 3D solid extrusion?

The model is cantilever beam of composite in which the SMA wire is embeded in neutral axis of the beam.

I only simulate deflection.

The simulation without SMA has been succesfully done which show deflection when applied load at the tip( free end)

How to model SMA wire embeded in composite beam using Abaqus using 3D solid extrusion?

The model is cantilever beam of composite in which the SMA wire is embeded in neutral axis of the beam.

I only simulate deflection.

The simulation without SMA has been succesfully done which show deflection when applied load at the tip( free end)

 i am doing FEA of spot welding with ansys.i am working with plane42 and plane67.how to get iterative solution for joule heating. please help me.

with regards,fatemeh mirzaei

Hi!



I'm already simulating a shape memory alloy behavior with the aid of the HETVAL subroutine, but I'd like to use UMATHT instead, since the HETVAL can't simulate correctly heat absortion(cooling down).



I've tried to add the required values for UMATHT without achieving a correct phase fraction simulation, and some times even no compilation of the .for file.



Is there any other examples that uses UMATHT besides the Stefan problem?

Any other recommendation about HETVAL to UMATHT migration?



Thanks in advance!