Several issues such as the choosing of the modification plan, anti-jamming and measuring of the yield stress σs in the modification process of the testing system in the universal testing machine are discussed.

A simple method of determinine the yield limit of material;

The strain distributions were measured,and the stress concentration and yield limit load and burst pressure were analyzed.

Though the peak value of the stress in part areas exceeds the yield limit of the cast steel,as the yielding areas are small an.

Based on the relation between the incipient yield pressure and the limit of yielding in cylinder according to the elastic disabled rule, a laboratorial method of determining limit of yielding of material is designed and a set of experimental data were gained by the method.

Based on the initial verification of the computer-simulation software for tensile fracture process of a B/Al composite,further simulation work was conducted in the present investigation to study the variation of the fracture behavior of the composite with different combinations of the matrix yield strength,σ_(ym) and the coefficient of variation in fiber streng- th distribution,CV.

The uniaxial compressive strength σ m , yield strength Y , Youngs modulus E , and Poissons ratio ν have been obtained.

The EJMA standard has provide the equation for the yield strength at design temperature of bellows Sy, and the yield strength at room temperature of the actual bellows material in the annealed condition Sym in the equation shall be gained from the certified test report.

The geometric form of the folded plate let the steel reaches yielding limit before reaches its elastic buckling limit.