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Dear Colleague,

I'm Bosnian student and i want to use in
the ABAQUS infinite elements for the 3D model. Model is very simple, 3D box
and load acting in the middle of the model. Around loading surface I'm
using C3D8 elements and under i would like to use CIN3D8 elements. I
used to model box and
infinity as two separate parts and i tied this together in assembly mode. In
input file i changed just elements type of infinity part in to the CIN3D8
elements. But when i run the analysis i always get the error like:

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I'm studying cracking analyses in a three point loaded specimen of a composed beam.I'm using ANSYS and i want to create codes for estimation of J integral and energy release rate in the vicinity of crack tip.After that i'll calculate the stresses and strains fields,and then i can compare the equivalent fields i retrived using CTOD  and K(I,II,III) factors (according to ANSYS algorithm).

My problem is that I'd like to find a relationship between the above mentioned quantities(J,G)  with K(I,II,III)factors.

I am graduated with MS degree of Offshore Engineering in Amirkabir University of technology, Tehran, Iran.

My Ms Thesis was “Interaction between water waves and floating moored spar platforms”. 

I defended my thesis at the end of October 2007, and I am looking for a PhD Course Scholarship now.

My field was naval architect in Bsc, and my thesis was about preparing ship hydrodynamic resistance and propulsion.

Hi
I have read some descriptions about beam element in chapter 14 of Element Library of ANSYS Theory Reference(ANSYS Help),it is mentioned that the stiffness matrix of a beam element in element coordinates is a 12x12 matrix that its elements are calculated in the same way as przemieniecki's book(Przemieniecki, J. S., Theory of Matrix Structural Analysis, McGraw-Hill, New York (1968))
Unfortunately I didn't find this book in the library,if any body has read this book,if it is possible guide me how przemieniecki have reached to such stiffness matrix?