在二维或三维的情况下，屈服极限是当所有应力分量的某个函数达到某一固定值时达到的。
In two and three dimensions the yield limit is reached when a certain function of all the stress components reaches a fixed value.
最危险点在接头的第一啮合齿的齿根处，最大应力应变值一般均超过屈服极限。
The most dangerous point is at the root of the first engaged tooth of a joint. Generally, the biggest values of stress and strain may exceed the yield limit.
主梁下挠变形的主要原因是受热引起的最大复合应力超过许用值，达到了屈服极限值，强度不满足要求。
The main reason of the main beam down deflection was that the most complex stress exceeded the admissible value and achieved the yield limit value.
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