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首页> 外文期刊>Materials Science and Engineering >A strain energy density method for the prediction of creep-fatigue damage in high temperature components
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A strain energy density method for the prediction of creep-fatigue damage in high temperature components

机译：应变能密度法预测高温零件的蠕变疲劳损伤

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摘要

The accumulation of creep-fatigue damage over time is the principal damage mechanism which will eventually lead to crack initiation in critical high temperature equipment. A model has been developed that assumes on a macroscopic level that the energy dissipated in the material may be taken as a measure of the creep damage induced in the material and hence the creep damage is directly proportional to absorbed internal energy density. The model developed is derived from considerations of mechanistic cavity growth and is based on rupture elongation to failure data using true strain. The predictions of the energy density exhaustion approach are compared with the results of creep-fatigue tests on low alloy ferritic steels. The predicted results of the energy density model are found to have good correlation with the measured creep-fatigue lives.
机译：随着时间的推移，蠕变疲劳损伤的累积是主要的损伤机理，最终将导致关键高温设备中的裂纹萌生。已经开发了一种模型，该模型在宏观水平上假设材料中耗散的能量可以作为材料中引起的蠕变损伤的量度，因此蠕变损伤与吸收的内部能量密度成正比。所开发的模型是基于机械腔的增长而得出的，并且基于使用真实应变的破坏数据的断裂伸长率。将能量密度消耗方法的预测结果与低合金铁素体钢的蠕变疲劳测试结果进行了比较。发现能量密度模型的预测结果与测得的蠕变疲劳寿命具有良好的相关性。

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