有的弯管由于局部应力较高，蠕变损伤明显。
Creep damage was marked in some bend which local stress is higher.
局部蠕变损伤理论的实质就是试样是多种不同蠕变性能材料的统一 ，并由蠕变应力再分布得到证实。
The essence of localized damage theory is that materials could be divided into several different groups with different creep damage and proved by stress redistribution.
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