Hi,<br><br>I am quite new in the software and find it both useful and at the moment confusing. <br>I have a user material (UMAT) written in Fortran for Abaqus and I would like to know if it is possible to wrap it into sfepy. <br>As the software is highly object oriented, it is not easy to follow the existing examples, so that one can create a new <br>problem and solve it using sfepy. All I need is to find out how to obtain the strain tensor or the deformation gradient tensor <br>so that I can pass it to my material update routine to update the stresses and the material Jacobian tensors and at the <br>end of the routine pass it to sfepy to calculate the force and the element Jacobian matrix.<br><br>I will appreciate any hint on this issue.<br><br>Thanks.<br><br>Hadi <br>