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Dear All,

I am trying to simulate mechanical behaviour of a concrete unit cell for uniaxial compression laoding. I have apllied periodic bounadary conditions on both lateral edges using linear equation option available in ABAQUS where as on top and bottom edges load is apllied. Deformed structure shows there is no lateral deformation and unit cell behaves as if it is confined laterally on both sides. I am confused about my boundary conditions whether they are correct or not. 

 Equation used to aplly periodic bounadary condition are

i make FEA for my master research in ANSYS PRO., i simulate a prestressed concrete beam with two precast units connected by contact element (CONTA.52). i used solid 65 for concrete modelling and link 8 for for prestressing steel with initial strain, i entered the stress strain curve for the concrete with linear isotropic, concrete and multilinear isotropic in five points as below:

strain=0.0004    stress = 12 Mpa

Strain = 0.001   stress = 30 Mpa

Strain = 0.0015   stress=37.5 Mpa

Hi everybody

could some one give me the Revised Johnson Cook model constants for Mild steel.

thanks in advance

Jayaram 

Hi Dears,

 I  writting an user subroutine to Add concrete with modified properties but I cann't link writed subroutine to Autodyn.

If you could help me I would be greatefull.

offcoarse your attention would be worthwhile.