Dynamic crack propagation in a heterogeneous ceramic microstructure, insights from a cohesive model

The influence of microstructure on the fracture properties of polycrystalline cubic boron nitride

“…A higher value of R CP implies that the crack path is more tortuous and more crack deflection takes place. Crack path roughness has been used by Taheri Mousavi et al [33] to study the effect of microstructure on dynamic crack propagation in heterogenous ceramic materials.…”

Local behavior of an AISI 304 stainless steel submitted to in situ biaxial loading in SEM

“…It is known that under high tensile stress, crack propagation results from two competing damage mechanisms, namely intergranular cracks (propagation along grain boundaries) and transgranular cracks (i.e. propagation through the grains) [34,35]. The type of crack propagation resulting from high biaxial stresses is here studied.…”

Modelling the criticality of silicon nitride surface imperfections under rolling and sliding contact

“…Sintered ceramics are heterogeneous materials, because they consist of more than one phase (see e.g. [13,14]) and the grains of Si 3 N 4 are anisotropic [15]. However, due to massive amount of grains and their random orientation, such polycrystalline materials as sintered Si 3 N 4 can be considered as continuum media, and their mechanical properties can be homogenized, including the properties responsible for cracking [14].…”

“…In such a study the assumption of the pre-existing crack can be relaxed, by simulating explicitly the crack initiation and its propagation in RCF. The XFEM based simulation of crack propagation under RCF in rails was presented in [17], and simulation of crack initiation/propagation under uniaxial load in Si 3 N 4 using a cohesive elements model with adaptive remeshing in [14]. Note, that differently from [14], where only the mode I (crack opening) was considered, the RCF simulations have to relate to the mixed mode and to the crack faces contact interaction (occurring when a crack is closed under compressive stress).…”

“…The XFEM based simulation of crack propagation under RCF in rails was presented in [17], and simulation of crack initiation/propagation under uniaxial load in Si 3 N 4 using a cohesive elements model with adaptive remeshing in [14]. Note, that differently from [14], where only the mode I (crack opening) was considered, the RCF simulations have to relate to the mixed mode and to the crack faces contact interaction (occurring when a crack is closed under compressive stress). It is fraught with high level complexities in mathematical formulation and numerical implementation leading to high computational effort (time consuming calculations) and possibly to convergence problem.…”