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material_damage_iterative_inline_impl.cc
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			/**
			* @file material_damage_iterative_inline_impl.cc
			*
			* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
			*
			*
			* @brief Implementation of inline functions of the material damage iterative
			*
			* @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
			MaterialDamageIterative<spatial_dimension>::computeDamageAndStressOnQuad(Matrix<Real> & sigma, Real & dam) {
			sigma *= 1-dam;
			}

			/* -------------------------------------------------------------------------- */
			template<UInt spatial_dimension>
			UInt MaterialDamageIterative<spatial_dimension>::updateDamage(UInt quad_index, const Real eq_stress, const ElementType & el_type, const GhostType & ghost_type) {
			AKANTU_DEBUG_ASSERT(prescribed_dam > 0.,
			"Your prescribed damage must be greater than zero");


			Array<Real> & dam = this->damage(el_type, ghost_type);
			Real & dam_on_quad = dam(quad_index);

			/// check if damage occurs
			if (equivalent_stress(el_type, ghost_type)(quad_index) >= (1-dam_tolerance) * norm_max_equivalent_stress) {
			if (dam_on_quad < dam_threshold)
			dam_on_quad +=prescribed_dam;
			else dam_on_quad = max_damage;
			return 1;
			}

			return 0;
			}

			/* -------------------------------------------------------------------------- */