10 #ifdef MOOSE_MFEM_ENABLED    38   mfem::Coefficient & 
_mu;
 static InputParameters validParams()
const InputParameters & parameters() const
Get the parameters of the object. 
 E is Young's modulus,  is Poisson's ratio 
mfem::Coefficient & _lambda
MFEMLinearElasticityKernel(const InputParameters ¶meters)
virtual mfem::BilinearFormIntegrator * createBFIntegrator() override
Class to construct an MFEM integrator to apply to the equation system.