عنوان مقاله [English]
Extensive efforts have been made by scientists and researchers in polymer science to understand the mechanism underlying the failure of polymer materials. Complex behavior of polymeric materials compared to other conventional materials (metals and ceramics) makes it difficult to study this behavior. The fracture of polymeric materials, which is classified into brittle or ductile, also depends on the mechanism governing their fracture. From the material science point of view, the fracture mechanics of polymer materials discusses the relationships and equations that govern fracture. These relationships lead to a deeper understanding and obtain the values of stress concentration, criteria, and modes of fracture and express their relationship to the stress intensity index. However, from the point of view of polymer science, not only the mechanics of fracture, but also the mechanisms governing fracture are of great importance. The three mechanisms of cracking, shear yielding and cavitation are described as the mechanisms governing the fracture of polymeric materials. Understanding which mechanism governs a polymer piece requires a thorough understanding of that piece as well as the operating conditions. In this paper, the mechanics of fracture and the mechanisms that govern it are discussed, as well as how to transfer the mechanism to another one.