Interlaminar Fracture Energy of Glass/ Epoxy Composite Laminate under Mode II Delamination Using Sentry Function

Three modes of fracture are achieved for Delamination, mode I, II and III, in which mode II is of a great importance. It depends on stacking sequence, material properties, production process and so on, which are measured by mode-II interlaminar fracture energy (GIIc). In this work, End Notch Flexure test (ENF), through Acoustic Emission (AE) method is used to simulate mode II interlaminar fracture and damage evolution. In this way, based on AE events and mechanical properties of glass/epoxy composite material, the mode II interlaminar fracture toughness, GIIc, is investigated. Also, the influence of inplane fiber orientation on fracture behavior of interfaces: [0/90], [0/45], [-45/45], with quasi-isotropic laminates and [0/90] With angle ply laminates, are studied. The sentry function is used to study the delamination process and to evaluate the delamination fracture toughness in mode II. Consequently, it is shown that the presented method to obtain GIIc through employing AE was useful.

کلیدواژه ها:

mode II Delamination ، Sentry Function ، Composite Laminate ، Acoustic Emission (AE)