对现有的剪断销剪切试验用重型单剪装置存在的问题进行了系统分析，提出了对该重型单剪装置结构优化的具体方案和实施办法。
The problems existing in large shear clamp for shear test of pins are analyzed in detail in this paper, and practical improvement method is given.
当接触面被完全剪断后，模型中的剪切应力出现了一定程度的下降，此后的剪应力在摩擦力的作用下基本保持不变。
However, as the interface was fully damaged, shear stress would decrease to a certain degree, and the residual shear stress nearly kept a constant value which equal to the friction force.
点焊试样剪切试验中存在脱壳式、剪断式和压断式三种断裂模式，所对应的熔核尺寸和剪切载荷依次增加。
There are three fracture modes in shearing tests, i. e. , exuviation, shear and crush fractures, with nugget dimensions and shearing loads increasing in turn.
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