In this paper,the damage theory of rheologic material with defect and the microscope technique are used to research the variation of crazing damage under creep condition on line and real time experimentally.

An optical technique to quantify the creep crazing damage in stressed transparent glassy polymeric sheet of PMMA is presented.

Through measuring the surface density of crazing damage, we can get the surface crazing density of the sample of PMMA under different stresses and testing time, and give the crazing damage regulation of surface density of sample of PMMA with the varieties of time, stress and field.

Example shows that the craze damage leads to the increasing of the size of plastic region.

The crack damage around the transverse partial bulkheads of the hold in a pure car carrier (PCC), as one of the major problems in PCC, is investigated.

This dissertation explore the mechanism of the crack damage emerge and the effective elementary of the crack expand to the engine cracking in root of serration for one-stage turbine disc from the prospectives of lab research and theroretical analysis,in addition to provide theory basis to adopt effective prevent measures.

Ripple damage mechanism of SiO_2 film induced by 1.064 μm pulsed laser;