屈服点是在应变有可观增加，应力没有增加的应力极限，在这个极限下，如果应变继续增加，应力就也会增加。
The yield point is the stress at which there is an appreciable increase in strain with no increase in stress, with the limitation that, if straining is continued, the stress will again increase.
如该设计基于应变硬化性能，设计应力通常在HAZ实际屈服点以上。
If the design is based on the strain hardened properties, the allowable design stress will usually be above the actual yield point of the HAZ.
超过屈服点之后，材料会继续变形，但是因为材料开始屈服，应力会减小。
Beyond the yield point, the material will continue to deform, but with less stress than before, because the material has begun to yield.
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