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Hello everyone, I am using ABAQUS to study the tangential behavior (friction) at the interface between rock-machine. I know tangential behaivour simualtion is key for my model, I read the manual, but still have some puzzels, hoping you could help me, much appreciated in advance!

1. what's the difference among mechanical constraint formulation of penalty contact method (another is kinetic), friction formulation of penalty for tangential behavior, and  constraint enforcement method of penalty for normal behavior. the explanation in manual seems ambiguous for me.

I am doing a FE formulation of surface elasticity. I wrote UEL for surface elements in addition to abaqus volume elements. But surfaces may have negative stiffness (constitutive relation as per Morton Gurtin's formulation). So as a result I am getting a warning of "Negative eigen values". Can any body tell me how abaqus is solving for this system matrix (with few negative eigen values) in Static General method?

Conditions in which EIGEN VECTOR zero

Any ideas/references/examples/ tuturials on how to apply  loading in ANSYS Workbench? Cyclic or variable amplitude loading.

Thanks.

I am working on semi rigid connections. I am getting difficulty in modelling semi rigid connection in ABAQUS 6.12. Please help me.

I test the proficiency of SPH method dealing with a benchmark numerical example solving Poisson's equation; SPH  shows the good efficiency in modeling the contours, but the value of results change for a different nodal distributions (different