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Hi there,

I am running into a problem where for a simple, 2D, axisymmetric, single element problem, I get a "singular" matrix for my stress.  Consequently my force equilibrium equations cannot be solved for the displacements at the nodes.

The principle stresses for the axisymmetric case are as usual, a 4x1 matrix sigma given as:

[sig1, sig2, tao, sig3]^T and obtained as:

[sigma]=[D][S][B3][u]

(my problem is that [D][S][B3] a 4x8 matrix for a four node axisymmetric element always comes out singular for the first load increment)

Hi there.

I am new to Abaqus. I am doing a research on powder compaction process but i required to insert iron powder properties into Abaqus. what do to simulate the process?
Please help out. Thank you.

Job Title: Project Leader, CAE

Location: Auburn Hills, MI 48326

Responsibilities To lead and participate in the effort of performing vibration/modal analysis on mechanical systems using predictive analysis tools to reduce resonance and optimize performance. Coordinates and provides engineering analysis services, predominately with finite element analysis, to the engineering community in a timely manner.

Qualifications

Required:

Purpose: Under general supervision, the postdoctoral research associate will be conducting research specifically in battery manufacturing R&D to lower cost, raise energy density, increase production yield, and address manufacturing bottlenecks. This incumbent will work in close collaboration with other researchers involved with ORNLs applied energy storage program. This position resides in the Department of Energy (DOE) Battery Manufacturing Facility and the Manufacturing Systems Research Group at the Oak Ridge National Laboratory (ORNL).

Dear all,

I'm trying to modeling an 3d Mode I delamination problem using VCCT method. C3DR8 element is used thereby. Every time after submitting the job it warned me with that "Solver problem: zero pivot...". I assume it may be caused by over-constraint, but I can't find where  I exactly goes wrong. I've uploaded the .inp file. Could anyone can give me a hand? Thanks a lot. 

Leo

Dear all, I am an applied mathematician and I  have been stucked by the this general question for a while, i.e.,  to determine the stiffness matrix of transversely isotropic material from known strain and stress tensors.  The definition of transversely isotropic tells us that the stiffness matrix can be defined by 5 constants, see attached figure. C₄₄ is easy to determine, so we can focus on the remaining 4 constants. I attempted to establish 4 linear equations for these 4 constants with the known strain and stress components.