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.
当应力达到屈服点，应变会急剧增大而应力保持不变。
When the stress reaches the yield point, a large increase in strain occurs with no increase in stress.
气体压力试验时的应力值，不得超过试验温度下材料屈服点的80%。
The value of stress under air pressure test shall not exceed 80% of the yield point of the material in test temperature;
液体压力试验时的应力值，不得超过试验温度下材料屈服点的90%；
The value of stress under hydraulic pressure test shall not exceed 90% of the yield point of the material in test temperature;
结果表明 ：其应力—应变曲线表现出屈服点低、连续屈服、没有明显的屈服点等特性 ；
The stress strain curves displayed the characteristics of low yield point, continuous yield and no obvious yield point.
结果表明 ：其应力—应变曲线表现出屈服点低、连续屈服、没有明显的屈服点等特性 ；
The stress strain curves displayed the characteristics of low yield point, continuous yield and no obvious yield point.
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