System approach of breakage mechanics for geological materials;

Consideration of mechanical fracture for plastics pressure pipe as viewed from application;

The mechanism of the mechanical effects of water-rock interaction on rock is explored by using the theory of chemistry,rock failure mechanics with chemical damage,the modeling method and the energy point of view.

The investigation shows that the strength of the elastic acoustic waves may surpass materials yielding ability and induce mechanical damage when the pump laser intensity is sufficiently high and the transverse scale of optics is sufficiently lo.

Preliminary research on the reasons for the mechanical failure of PVC-U feed water pipe and the preventive measures;