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shell elements

Quick start - strains from displacements in triangular mesh

Submitted by Samarth Raut on
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shell elements
membrane theory
finite strains

Hello,

  I need suggestions/advice regarding quick starting point for getting strains (Green-Lagrangian) from displacement vector field defined over nodes of a triangular mesh ?

I understand that this is a well established theory, however, I was wondering if I can avoid reinventing the wheel !

Can someone help  me regarding which would be the fastest way to get there ( compute strains )? 

Thanks, 

ABAQUS/Standard - 2D beam elements vs 3D shell elements

Submitted by bilim on
ABAQUS
shell elements
beam elements

Dear collegues,

I am modeling deformation of a simple triangular shape, /\, which is constrained at one end and the other end is free to move on the x direction. There is a displacement loading on the top corner and the output is the reaction force on the y direction at the free end.

 I used Abaqus/ Standard and modeled this problem in 2D beam elements and 3D shell elements. The material is aluminum with plasticity and nonlinear geometry is on. 

Ansys Ls-Dyna

Submitted by Bill M. Manolopoulos on
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Explicit
UPF
shell elements

I am using
Ansys Ls-Dyna to solve a case where a rigid indentor in the shape of bow
penetrates double skinned structural models. I want to use UPF (User
Programmable Features) in order to define a custom failure criterion. From the “Guide
to Ansys User Programmable Features” I read that the specific subroutine (usrfc6)
for defining custom failure criteria is available only with shell99, solid46
and shell91. However in Ansys Ls-Dyna, the user cannot use neither of the above
shell elements. The only shell element that is used in explicit dynamics is
shell163. Is there any way to program or use my failure criterion in Ansys

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