Morphology under light microscope and electron microscope,the creeping rate,and stress force to break were compared.

Analysis on the breaking stress of sucker rod and avoidable measures in Guangbei Area of Bamianhe Oilfield;

Effects of notch opening angle on local cleavage fracture stress;

In the case of the limited level density of the material surface energy, the fracture stress and the calculation formula of the engineering damage were studied.

The local cleavage fracture stress a, was measured.

Combined with the project examples,it introduces the construction methods of basic mass concrete,gets the calculation to the temperature of mass concrete,foundation restraint coefficient,shrink,maximum stress and the anti-crack coefficient,and puts forward the steps of assuring the not crack of concrete,this will assure the project quality of mass concrete.

It has found out these members dangerous position with the maximum stress and calculated the stress value, made the goal and the range of daily check more definite and concentric, provided the theory basis for establishing reasonable particle check system.

The stress accumulating region and the maximum stress is calculated through cosmosm statics analysis program.