MATERIALS DESIGN AGAINST FRACTURE
抗断裂的材料设计

From methodological point of view, the concepts of failure, property and structure are clarified, their relationship and methods of analyses discussed. The design of materials against the following three types of fracture are elucidated: (1) Creep ruptureSystematic development of new alloy systems, establishment of phenomenalogical equations about property, structure and their relationship for design purpose; (2) Intergranular fracture-Phenomenalogical equation between the grain boundary concentration of impurity and the solid solubility of the impurity is obtained by induction method; the effect of grain boundary impurity on the work of intergranular fracture is derived with quasichemical theory; and the expert system is established; (3) Environmental cracking-The results of mechanism research are used to set up the guide lines for improvement and design of materials.