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FEA of the Tibial Post of a Knee Prosthesis

Tibial post failure has been reported in several retrieval studies for knee surgeries using posterior-stabilized (PS) prostheses. Fractures of the tibial post are considered to be caused by high stress-induced destruction (bending and tensile forces). The design of polyethylene inserts requires a certain level of plastic deformation to take place without the risk of deformation. The design of the tibial post varies markedly among manufacturers.

LSDYNA UMAT- history variable choice


I'm presently working on implementing anisotropic yield criteria in LSDYNA as UMAT.

I understand from the LSDYNA documents that effective plastic strain is a default history variable.  So when we code, can we omit the update of effective plastic strain as a history variable? If so, where is it stored and how is it retrieved during post-processing ?

PingZhou's picture

what's the detail reasons that one material model can only suitable for some specific (not all) element formulation in LS-DYNA?

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it's a basic problem. In LS-DYNA, with explicit or implicit method, one material model is only suitable for some element formulations/types, but not for all element types. There must be many deep reasons and some aspects to be considered.

why element formulation can not independent on material model?

could you tell me some detailed deep reasons or links about this? thanks!

EFG Method using LS-Dyna

Hello All,


I am a Masters Student trying to model a cyst in a Nerve for which i need to obtain large deformation(not displacement) which is not able to model with the help of Finite Element Tools(used Abaqus previously but no success).

 I searched through the Internet and got to know that Meshless Methods are well known for Large Deformation.I found on the web that LSDyna has commercial code of EFG which i feel will be useul to me.

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