Method of caustics in fracture mechanics of mechanically anisotropic materials

Influence of loading rate on dynamic fracture behavior of fiber-reinforced composites

“…where δ is a constant determined by the mechanical properties of the material and experimental conditions; d the thickness of the specimen; and z 0 the distance between the specimen and the reference plane, which is 350 mm in this paper; D 1 (t) the characteristic dimension of the caustic curves, which can be measured during the crack propagation process [8] . Typical shadow spot patterns of GFRP-0 are recorded as shown in Fig.1.…”

Caustics method in dynamic fracture problem of orthotropic materials

“…Theocaris [6] first investigated the stress concentrations in an anisotropic plane by this method in 1976, and developed it to determine the elastic SIF in orthotropic materials in 1981 [7]. After that, Semenski [8] and Baik et al [9] separately focused on the static fracture mechanics in anisotropic materials by caustics method, and Baik et al found that physical properties of anisotropic materials could affect the shape of shadow spot and initial curve seriously. Zhang et al [10] conducted the research work on local singularities at the crack tip of neat polypropylene (PP) and polypropylene/CaCO 3 nanocomposites by the reflective optical caustics method, and discussed the influence of nonionic modifier and CaCO 3 on fracture properties of nanocomposites.…”

Dynamic initiation and propagation behaviour of sub‐interfacial cracks in PMMA/aluminium bi‐material system

“…Rosakis 8 and Arakawa et al 9 studied the dynamic crack propagation problem using optical caustic technology in isotropic material. Semenski 10 studied the mixed‐mode fracture mechanics problem of mechanically anisotropic materials using the method of caustics. Patterson and Olden 11 performed a comparative study on the optical analysis of crack tip stress fields by the method of caustics, photoelasticity and moiré inteferometry.…”