An Energy-Based Uniaxial Fatigue Life Prediction Method for Commonly Used Gas Turbine Engine Materials
An Energy-Based Uniaxial Fatigue Life Prediction Method for Commonly Used Gas Turbine Engine Materials
复制标题
DOI：
10.1115/1.2943152
复制
发表时间：
2008-11
影响因子：
1.5
通讯作者：
O. Scott-Emuakpor;Herman Shen;T. George;C. Cross
中科院分区：
文献类型：
--
作者：
O. Scott-Emuakpor;Herman Shen;T. George;C. Cross
提出了一种新的基于能量的寿命预测框架，用于计算不同应力比下的轴向和弯曲疲劳结果。寿命预测框架的目的是评估燃气涡轮发动机中使用的材料的性能，如钛6Al-4V （Ti 6AI-4V）和铝6061-T6 （Al 6061-T6）。为开发这种基于能量的框架所做的工作包括以下几个方面：(1)为Al 6061-T6在不同应力比下的轴向和弯曲疲劳制定了新的寿命预测准则；(2)使用先前开发的改进的单轴基于能量的方法来获得疲劳寿命，而不是疲劳极限区域(Scott-Emuakpor等人，2007，“改进的高周疲劳准则的开发”，ASME J. Eng。燃气轮机动力，129,pp. 162-169),(3)，并将基于概率能量的疲劳寿命计算方案纳入一般单轴寿命准则（框架的第一个实体），该方案能够基于指定的百分比置信度构建预测区间。通过对最近获得的Al 606-T6和Ti 6Al-4V数据的理论近似和实验结果的比较，验证了本文工作的精度。对比结果显示出非常好的一致性，从而验证了该框架对常用燃气涡轮发动机材料进行精确单轴疲劳寿命预测的能力。
A new energy-based life prediction framework for calculation of axial and bending fatigue results at various stress ratios has been developed. The purpose of the life prediction framework is to assess the behavior of materials used in gas turbine engines, such as Titanium 6Al-4V (Ti 6AI-4V) and Aluminum 6061-T6 (Al 6061-T6). The work conducted to develop this energy-based framework consists of the following entities: (1) a new life prediction criterion for axial and bending fatigue at various stress ratios for Al 6061-T6, (2) the use of the previously developed improved uniaxial energy-based method to acquire fatigue life prior to endurance limit region (Scott-Emuakpor et al., 2007, "Development of an Improved High Cycle Fatigue Criterion, " ASME J. Eng. Gas Turbines Power, 129, pp. 162-169), (3) and the incorporation of a probabilistic energy-based fatigue life calculation scheme to the general uniaxial life criterion (the first entity of the framework), which is capable of constructing prediction intervals based on a specified percent confidence level. The precision of this work was verified by comparison between theoretical approximations and experimental results from recently acquired Al 606-T6 and Ti 6Al-4V data. The comparison shows very good agreement, thus validating the capability of the framework to produce accurate uniaxial fatigue life predictions for commonly used gas turbine engine materials.