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NonLinear Beam formulation

Submitted by xhawk on

Hello,

  I am phd student in mechanical engineering. I want to use of total lagrangian formulation for analysis of a cantilever beam element using UEL abaqus subroutines. my difficulty is how to calculate the internal load and the tangent stiffness matrix. my code does not converge. can you help me. if there is a simple code I was wondering if someone aware me.

 

Thanks in advance