<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1453560647935_2785">Please help </div><div id="yui_3_16_0_1_1453560647935_2785">I am working on getting the elastic constant of a monoclinic structure using quantum espresso and i cannot get the required stress required to be applied to the system in order to get my Bulk modulus matrix, shear modulus etc to help me get my C11 to C66 </div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr">i will appreciate if anybody can recommend any text or research material or anything to help</div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr"><br></div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr"><br></div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr">Agbaoye Ridwan Olamide </div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr">Federal University of Agriculture, Abeokuta</div><div id="yui_3_16_0_1_1453560647935_2785" dir="ltr">M.Sc. in view</div></div></body></html>