Therefore, we come to the conclusion that the deformation of coke drum is the result of progressive plastic deformation.
由此可断定焦炭塔的鼓胀变形是渐次塑性变形积累的结果。
The maximum operating stress is computed and limited to prevent conditions of ratchet(progressive plastic deformation with cycles), and not to fatigue.
也有一个对最大组合应力的限制，持续负载加上位移应力，以限制渐变。
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