Hertzian crack propagation in graded glass/ceramic composites

In literature, the concept of material gradation is shown to inhibit surface crack initiation in glass/ceramic composites subjected Hertzian indentation. However, cracks could yet initiate due relatively higher loadings or presence flaws/defects. Hence, characterization graded concerning resistance against and propagation manifests itself as a prominent matter. this study, axisymmetric evolving propelled by rigid cylindrical punch are investigated employing novel recursive method, called stacked-node procedure. Crack trajectories their susceptibilities predicted via minimum strain energy density (MSED) criterion regarding growth (R-curve) ceramics. The stress trajectory approach also considered for homogeneous glass reveal reliance effectiveness MSED present problems. Mori–Tanaka relations adopted model elastic modulus Poisson's ratio variations through composites, which implemented on simulations finite element approach. problem practically producible composite comprised oxynitride fine-grained silicon nitride ceramics (Si3N4) treated case study. degree assessed mitigation risks.