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In the FEM book by KJ Bathe and also in the fem book by G.Dhatt, it is said the direct solvers are generally more convenient than iterative solvers and new versions of them include reordering and efficient use of skyline method. In contrast there are iterative solvers with capability to directly manipulate sparse format of matrices. I am now working on XFEM coding with C++ and don't know what type of solver would be the best for XFEM. the conditioning issues of matrices obtained from XFEM would be a difficulty for the choice of preconditioners.

Dear all,

I must apply a user defined heat flux to ABAQUS for getting thermal profile in defferent nodes and elements. How can I apply this user defined heat flux to AVAQUS and how can I write this user defined heat flux for ABAQUS?

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 hello dosto,

               i am studying in B-tech 2nd year (mech.) in DCE . I want to know  about detonation and knocking of fuels in detail.

thank you

shankar Gupta

    This days, I am working on the dynamics analysis using the Abaqus. the implicit dynamic integration method in abaqus is HHT-alpha. I found that a very strange parameter about the method is the half-step residual tolerance . I don't know the parameter is whether important or not and how to determine it.

thank you very much :)

excuse，can you tell me how to handle the promble when i create an iteraction between two solid parts, and it cause the problem of hard to convergence.

the warning is:

PLEASE SEND THE PROCEDURE FOR TRANSIANT ANALYSIS OF A BEAM COLUMN JOINT.HOW THE REINFORCEMENT IS GLUE WITH THE CONCRETE

B.Thanukumari.