Modeling microarchitecture and mechanical behavior of nacre using 3D finite element techniques Part I Elastic properties

摘要: Three dimensional finite element models of nacre were constructed based on reported microstructural studies the 'brick and mortar' micro-architecture nacre. 3D eight noded isoparametric brick elements used to design microarchitecture Tensile tests simulated using this model. The conducted at low stresses 2 MPa which occur well within elastic regime thus effects related locus extent damage ignored. Our simulations show that values moduli organic (0.005 GPa) aragonitic platelets (205 GPa), displacements observed in are extremely large correspond a very modulus 0.011 GPa. is order 50 reason for inconsistency may arise from two possibilities. Firstly, layer due its multilayered structure possibly composed distinct layers different moduli. continuously changing approach aragonite near organic-inorganic interface. Simulations variable phase suggest an 15 GPa consistent with behavior Another explanation higher localized platelet-platelet contact. Since lies above extremes (i.e. 205 it suggested combination possibilities, i.e. interface contact can result properties