Relevant energy term
fijkl Pi d(e_jk)/dx_l
can be recast into a form that does not require second order spatial derivatives of elastic displacements.
Additional eigenstrains proportional to S_ijkl f_mnkl dP_m /dx_n are required but are trivially implemented with current approach.
ProjectionAux system used to compute the energy fijkl Pi d(e_jk)/dx_l by projecting the strain fields from FIRST LAGRANGE displacements to strain fields that are themselves FIRST LAGRANGE yielding access to derivatives
Relevant energy term
fijkl Pi d(e_jk)/dx_l
can be recast into a form that does not require second order spatial derivatives of elastic displacements.
Additional eigenstrains proportional to S_ijkl f_mnkl dP_m /dx_n are required but are trivially implemented with current approach.
ProjectionAux system used to compute the energy fijkl Pi d(e_jk)/dx_l by projecting the strain fields from FIRST LAGRANGE displacements to strain fields that are themselves FIRST LAGRANGE yielding access to derivatives