upper yield stress

On twin shear stress yield criterion in terms of the invariants of the stress deviatoric tensor magnitude of deviatoric stress in the upper lithosphere

用应力偏量不变量表示双剪应力屈服准则

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The paper analyses minimal angle of defection in test machine dial ( low accuracy), test piece glide, faint defintion ( upper yield strength-lower yield strength-yield strength), different stress speed, so as to register errors, and puts forword correction.

分析材料试验机度盘偏转角度小（准确度低）、试样打滑、定义（上屈服强度-下屈服强度-屈服强度）模糊、不同应力速率等导致误读，并针对误读原因提出纠正方法。

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