Dynamic Fracture Behaviour of Pre-Stressed Monoclinic Crystalline Structure Under Moving Load

The objective of this study is to investigate plane wave propagation through a monoclinic crystalline layer containing a dynamically propagating Mode I collinear cracks under the action of a moving punch load. The analysis focuses on the influence of pre-stress on fracture parameters in anisotropic media. Within the framework of linear elastic fracture mechanics, the moving boundary-value problem is reformulated using the Galilean transformation and subsequently reduced to coupled Cauchy-type singular integral equations, which are solved analytically through the Hilbert transform technique. Explicit closed-form expressions for the stress intensity factors and crack opening displacement are derived. The results reveal that pre-stress significantly alters the dynamic fracture behaviour, with pronounced effects observed at higher crack velocities. Moreover, localised moving loading induces stronger responses in anisotropic crystals than in isotropic counterparts. The novelty of this work lies in its rigorous analytical treatment of dynamic fracture under moving loads in pre-stressed anisotropic crystalline structures, providing valuable insights for the design and reliability of MEMS, surface acoustic wave devices, and biosensors.