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hi.

 i need some information about molecular dynamics application in mechanics.

please help me.

I am trying to apply a horizontal (x-direction) acceleration force to the bottom surface of a column via a explicit dynamic analysis.  Every time I try to run the program, I get an error what states that wave-speed deformation exceeds 1.0 in some of the elements.  Since I’m not interested in the stress at the bottom of the column, rather the response of the column due to the g-load, should I make the bottom surface a rigid body (or surface if I can)?  The DOF in the x direction is free to translate.  Any tips on how to go about this problem would be appreciated. 

Hi...

I have a hard time finding problem sets for validation and benchmarking of methods and codes for 3d fluid simulation with free boundaries. Please guide me to (standardized) problem sets or key litterture that is a suitable starting point. If there are not many standardized tests I would like to initiate a dsicussion about what a good test collection should be. I understand that iMechanica is focused more on solid mechanics than fluid dynamics but the overlap is big.

Hi 

I want to model the lightweight slab and since i do not have the material behaviour of the slab, i have to do testing. i was searching in internet and i got two different concept: "bending stress-strain curve" and "compression stress-strain curve". i do not know which one should i follow? and is there any difference?

Regards.

HI, everyone,

 This is pflines, i am working on the mode I\II fracture toughness.

i want to use the asymmetric four-point-bend sepcimens to get the value of KI and KII,

 but did not found a clear formulation to caculate the KI and KII,

 anyone could help me?

i want do anlysis in flow induced vibrations in pipes with ansys12/abaqus 9.6.1 i want tutorial please help me