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首頁> 外文期刊>Journal of Engineering for Gas Turbines and Power >A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method
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A Robust Optimization Technique for Calculating Scaling Coefficients in an Energy-Based Fatigue Life Prediction Method

機譯：基于能量的疲勞壽命預(yù)測方法中尺度系數(shù)的穩(wěn)健優(yōu)化技術(shù)

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The energy-based lifing method is based on the theory that the cumulative energy in all hysteresis loops of a specimens' lifetime is equal to the energy in a monotonic tension test. Based on this theory, fatigue life can be calculated by dividing monotonic tensile energy by a hysteresis energy model, which is a function of stress amplitude. Due to variations in the empirically measured hysteresis loops and monotonic fracture area, fatigue life prediction with the energy-based method shows some variation as well. In order to account for these variations, a robust design optimization technique is employed. The robust optimization procedure uses an interval uncertainty technique, eliminating the need to know an exact probability density function for the uncertain parameters. The robust optimization framework ensures that the difference between the predicted lifetime at a given stress amplitude and the corresponding experimental fatigue data point is minimized and within a specified tolerance range while accounting for variations in hysteresis loop energy and fracture diameter measurements. Accounting for these experimental variations will boost confidence in the energy-based fatigue life prediction method despite a limited number of test specimens.
機譯：基于能量的起振方法基于以下理論：樣品壽命的所有磁滯回線中的累積能量等于單調(diào)張力測試中的能量。基于該理論，可以通過將單調(diào)拉伸能除以磁滯能量模型來計算疲勞壽命，磁滯能量模型是應(yīng)力振幅的函數(shù)。由于經(jīng)驗測得的磁滯回線和單調(diào)斷裂面積的變化，基于能量的方法的疲勞壽命預(yù)測也顯示出一些變化。為了解決這些變化，采用了健壯的設(shè)計優(yōu)化技術(shù)。穩(wěn)健的優(yōu)化過程使用區(qū)間不確定性技術(shù)，從而無需知道不確定參數(shù)的精確概率密度函數(shù)。健壯的優(yōu)化框架可確保在給定應(yīng)力幅度和相應(yīng)的實驗疲勞數(shù)據(jù)點之間的預(yù)測壽命之間的差異最小，并在指定的公差范圍內(nèi)，同時考慮了磁滯回線能量和裂縫直徑測量值的變化。盡管測試樣本數(shù)量有限，但考慮到這些實驗差異仍將增強基于能量的疲勞壽命預(yù)測方法的信心。

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    《Journal of Engineering for Gas Turbines and Power》 |2013年第12期|122502.1-122502.7|共7頁
  • 作者單位

    Mechanical and Aerospace Engineering Department, The Ohio State University, Building 148, 201 West 19th Avenue, Columbus, OH 43210;

    Mechanical and Aerospace Engineering Department, The Ohio State University, Building 148, 201 West 19th Avenue, Columbus, OH 43210;

    Mechanical and Aerospace Engineering Department, The Ohio State University, Building 148, 201 West 19th Avenue, Columbus, OH 43210;

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