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首页> 外文期刊>Proceedings of the institution of mechanical engineers >The use of the theory of critical distance and the stress-gradient approach in the fatigue life estimation of notched components
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The use of the theory of critical distance and the stress-gradient approach in the fatigue life estimation of notched components

机译：临界距离理论和应力梯度法在缺口构件疲劳寿命估算中的应用

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Fatigue life prediction for machine components is a fundamental factor in the industrial world, and therefore several methods can be traced in technical literature to estimate life of notched components. The present paper correlates the classical stress-gradient approach, or support factor method, proposed by Siebel, Neuber and Petersen with the more recent theory of critical distance approach by Tanaka and Taylor. On one hand, the main asset of the support factor method is the punctual information about the stresses needed to estimate the effective stress, namely the maximum stress and stress gradient at the hot spot. By contrast, the theory of the critical distance needs the calculation of the stress distribution for a finite depth inside the material. The main drawback of the support factor method is that the material parameter rho* is available only for a limited series of materials. In order to overcome this limitation, the paper investigates the correlation between the material parameter rho* and the critical distance L by relying on a parametric stress function. The proposed correlation aims at giving a simple method for the industrial engineers, which often needs straightforward methods to tackle practical problems. A comparison between the two methods is carried out by considering three different benchmark geometries: a typical V-notched specimen, a vessel under internal pressure and a complex industrial hydraulic control valve. In the first two benchmarks, the effective stresses are analytically retrieved and compared using both methods while an elastic finite element analysis is performed for the last one. The close match of the fatigue life prediction between the methods supports the possibility to exploit the data available in literature for the critical distance in order to estimate the effective stresses with the support factor method.
机译：机械零件的疲劳寿命预测是工业界的一个基本因素，因此可以在技术文献中找到几种方法来估计缺口零件的寿命。本文将Siebel，Neuber和Petersen提出的经典应力梯度方法或支持因子方法与Tanaka和Taylor的更新的临界距离方法理论联系起来。一方面，支持因子方法的主要资产是关于估计有效应力所需的应力的守时信息，即最大应力和热点处的应力梯度。相比之下，临界距离理论需要计算材料内部有限深度的应力分布。支持因子方法的主要缺点是材料参数rho *仅适用于有限系列的材料。为了克服这个限制，本文通过参数应力函数研究了材料参数rho *和临界距离L之间的相关性。拟议的相关性旨在为工业工程师提供一种简单的方法，该方法通常需要直接的方法来解决实际问题。两种方法之间的比较是通过考虑三种不同的基准几何形状进行的：典型的V型缺口试样，内部压力容器和复杂的工业液压控制阀。在前两个基准中，使用两种方法对有效应力进行了分析检索并进行了比较，而对最后一个进行了弹性有限元分析。两种方法之间疲劳寿命预测的紧密匹配，支持了利用文献中有关临界距离的数据进行估算的可能性，以便通过支持因子方法估算有效应力。

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