Based on the experimental results of local temperature field and pyromagnetic effect at the process zone of the crack-tip formed in the evolution period of defects, in this paper, the expressions of thermo-mechanical coupling and thermo-electromagnetic coupling effects in the basic equation group of rheological material containing defects are first proposed.

The experimental results of pyromagnetic effect revealed in the rupture process of rheological material with defects make known that:owing to the existence of internal temperature gradient leads to the occurrence of pyromagnetic effect in the fracture process zone at crack tip.

Study on the K criterion of Ⅰ-Ⅱ mixed-mode fracture of concrete considering the fracture process zone;

In the previous study on the size effect of fracture toughness of concrete,the influences of fracture process zones,which occur at the front edge of concrete cracks,are not taken into account.

Based on fictitious crack model(FCM) and continuous damage theory, the formulas on the length and damage degree of fracture process zone (FPZ) for RCC are established.

The determination of the stress state and its range in crack tip zone has not yet been solvedtheoretically and is almost impossible by customary experimental methods.