In two and three dimensions the yield limit is reached when a certain function of all the stress components reaches a fixed value.
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。
This value is used to compare the strength of materials, but a safety factor is applied when making design calculations, to bring the working stress well below the limit of proportionality.
此值被用来比较材料的强度，但是当设计计算时，要用一个安全系数，使工作应力低于比例限制。
This limit is essentially a stress amplitude value over which higher stresses can not be transmitted.
应力波幅值高于该极限就不能通过。
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