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首页> 外文期刊>Chemical and Petroleum Engineering >LIFE ESTIMATION FOR COMPONENTS OF PRESSURE VESSELS AND PIPELINES DUE TO CORROSION UNDER STRESS
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LIFE ESTIMATION FOR COMPONENTS OF PRESSURE VESSELS AND PIPELINES DUE TO CORROSION UNDER STRESS

机译：应力作用下压力容器和管道组件的寿命估算

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摘要

Very varied conditions govern the cracking of components in pressure vessels and pipelines under stress, and they are dependent on the grade of steel, the medium, and the working parameters. Here I consider a phenomenological model for the working life in corrosion cracking. The physical nature of the mechanism is not examined. The method is based on a model for a fictitious crack devised for fatigue failure. We assume that the smooth surface of the component has an initial crack of depth l_0, for which ΔK_(th) = 1.12Δσ_(th)(πl_0)~(1/2) (1) where ΔK_(th) is the threshold value of the stress intensity coefficient (SIC), which is such that crack fatigue growth "does not occur; and Δσ_(th), is the stress range in tension-compression of the smooth specimen, which corresponds to unrestricted lifetime.
机译：压力容器和管道中的部件在应力作用下的开裂情况千差万别，它们取决于钢的等级，介质和工作参数。在这里，我考虑了腐蚀裂纹工作寿命的现象学模型。该机制的物理性质未经检查。该方法基于为疲劳失效而设计的虚拟裂纹模型。我们假定组件的光滑表面具有深度为l_0的初始裂纹，其中ΔK_（th）=1.12Δσ_（th）（πl_0）〜（1/2）（1），其中ΔK_（th）为阈值应力强度系数（SIC）的“不发生裂纹疲劳增长；Δσ_（th）”是光滑试样在拉伸压缩过程中的应力范围，对应于不受限制的寿命。

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