| 講演要旨： |
If a structure, in meter, millimeter or micrometer or even smaller scale, is composed of many different parts and each part is made by different materials, it is very possible that many interface corners exist in several local fields of the structure. Due to the mismatch of thermal or elastic properties, failure initiation and propagation usually occur near interface corners. To understand the failure behavior of interface corner, several works regarding its stress singular orders and stress intensity factors have been done vastly in the literature. In this presentation, proper definitions and computing methods for these two important parameters of interface corners will be reviewed. With this review, it's hoped that a universal failure criterion connecting the homogeneous cracks, interface cracks and interface corners can be established through suitably designed experiments with unified defined parameters. Due to the success of defining proper parameters for interface corner problems, we are now doing some works on (1) calculation of stress intensity factors through H-integral for 3D analysis, thermal effects, and prescribed surface conditions, etc.; (2) experimental measurement of fracture toughness and development of failure criterion for interface corners; (3) applications in electronic package − multiscaled FEM modelling; (4) interface cracks between thin layers, and cracks near the interface, etc.; (5) proper selection of the reference length for problems with complex singular orders. |
