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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