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material_damage_linear_inline_impl.cc
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			/**
			* @file material_damage_linear_inline_impl.cc
			*
			* @author Nicolas Richart <nicolas.richart@epfl.ch>
			* @author Marion Estelle Chambart <marion.chambart@epfl.ch>
			*
			*
			* @brief Implementation of the inline functions of the material damage linear
			*
			* @section LICENSE
			*
			* Copyright (©) 2010-2012, 2014 EPFL (Ecole Polytechnique Fédérale de Lausanne)
			* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
			*
			*/

			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			inline void
			MaterialDamageLinear<spatial_dimension>::computeStressOnQuad(Matrix<Real> & grad_u,
			Matrix<Real> & sigma,
			Real & dam,
			Real & K) {
			Real Fdiag[3];
			Real Fdiagp[3];

			Math::matrix33_eigenvalues(grad_u.storage(), Fdiag);

			Fdiagp[0] = std::max(0., Fdiag[0]);
			Fdiagp[1] = std::max(0., Fdiag[1]);
			Fdiagp[2] = std::max(0., Fdiag[2]);

			Real Ehat=sqrt(Fdiagp[0]Fdiagp[0] + Fdiagp[1]Fdiagp[1] + Fdiagp[2]*Fdiagp[2]);

			MaterialElastic<spatial_dimension>::computeStressOnQuad(grad_u, sigma);

			Real Fd = Ehat-K;

			if (Fd > 0) {
			dam = (Ehat - Epsmin) / (Epsmax-Epsmin)*(Ehat/Epsmax);
			dam = std::min(dam, 1.);
			K=Ehat;
			}

			sigma *= 1-dam;
			}