By means of testing of the compositions,metallographic organism and mechanical properties,the reasons of body fracture of 6135 supercharged diesel engine were thoroughly analyzed.

The crystal cracking was studied and the results shown that crystal cracking is related to the pulling rate,rates of rotation and cooling.

The crystal cracking was studied and the results show that the crystal cracking is related to package, pulling rate,speed of rotation and cooling speed.

The crystal cracking was studied and the results show that crystal cracking is related to the temperature gradient, pulling rate, speed of rotation and crystal size,and the thermal stress is a main factor which leads to the crystal cracking at the same time.

Analysis on the mixture wall crack and the fountation treatment;

On the top wall crack and prevention of brick-concrete structure;

It is pointed out that the main reason of wall crack is due to great drying shrinkage of the material,so the first thing is to enhance study and improve production to make the drying shrinkage value of b.

Matrix crack is one of the primary damages for composite pressure tank.

For matrix cracking and large deforming, the deformation of a filament wound case is analyzed and calculated.

This paper analyzes on the causes and mechanism of the cracks of the filler wall bricking-up,and connecting with the technique of the bricking-up masonry,expounds the steps of the aerated concrete block construction,and advances some measures for preventing and controlling the cracks.

In connection with the geological and hydrological conditions,the site testing results and the theoretical analysis of the wall cracking of an old adjacent building,the paper has found its causes to be inappropriate choice of the foundation pit shoring,lack of impermeability of the ground,bad construction quality and lack of early warning.