[Pw_forum] elastic constant

[himanshu at apsara.barc.ernet.in]

Dear All
I want to calculate elastic constant of an orthorhombic system using stress 
calculation. I have gone through many papers. There it is written that to 
determine nine elastic constant, three orthorhombic and one triclinic strain is 
requred. But I could not understand whether the strain should be volume 
conserving or not. And what orthorhombic, triclinic matrix I sould use.I will 
appreciate your help.
With Best Regards
Himanshu



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