Failure Mechanisms of High Temperature Components in Power Plants
Failure Mechanisms of High Temperature Components in Power Plants
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DOI：
10.1115/1.482794
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发表时间：
2000-07
影响因子：
1.2
通讯作者：
R. Viswanathan;J. Stringer
中科院分区：
文献类型：
--
作者：
R. Viswanathan;J. Stringer
高温部件失效的主要机制包括蠕变、疲劳、蠕变疲劳和热疲劳。在重型部件中，尽管裂纹可能通过这些机制开始并增长，但在启动-关闭瞬态期间的低温下可能发生最终失效。因此，断裂韧性也是一个关键的考虑因素。通过上述机制，在裂纹萌生和裂纹扩展方面都取得了相当大的进展。应用实验室数据来预测部件寿命常常因无法模拟实际应力、应变循环、截面尺寸效应、环境效应和长期退化效应而受阻。本文将提供一个广泛的视角，故障机制和寿命预测方法及其意义的背景下，公用事业放松管制。
The principal mechanisms of failure of high temperature components include creep, fatigue, creep-fatigue, and thermal fatigue. In heavy section components, although cracks may initiate and grow by these mechanisms, ultimate failure may occur at low temperatures during startup-shutdown transients. Hence, fracture toughness is also a key consideration. Considerable advances have been made both with respect to crack initiation and crack growth by the above mechanisms. Applying laboratory data to predict component life has often been thwarted by inability to simulate actual stresses, strain cycles section size effects, environmental effects, and long term degradation effects. This paper will provide a broad perspective on the failure mechanisms and life prediction methods and their significance in the context utility deregulation.