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首页> 外文期刊>Materialwissenschaft und Werkstofftechnik >Application of continuum damage mechanics model in terms of fatigue life assessment for low cycle and quasi static loadings
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Application of continuum damage mechanics model in terms of fatigue life assessment for low cycle and quasi static loadings

机译：连续损伤力学模型在低周疲劳和准静态载荷疲劳寿命评估中的应用

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摘要

The aim of this study is to test the classical Lemaitre model based on continuum damage mechanics (CDM) approach in the range of low cycle and quasi-static fatigue life. Study is carried out with the use of results of experimental tests for C45 steel (according to AISI: 1045 steel) carried out under variable-amplitude loading. Loading programs are of two-step character and include blocks of cycles of different lengths and R= -1 coefficients. Fatigue lives are calculated according to Lemaitre model from experimentally obtained stress and strain histories recorded during fatigue tests. The results are compared with experimental tests results and with fatigue lives calculated with the use of by traditional fatigue approach based on Palmgren-Miner damage summation hypothesis. Experimental test of fatigue life calculation results for C45 steel reveals that continuum damage method, using the recorded stresses and strains, predicts fatigue life better as compared to the remaining methods. The study also contains many detailed analyses of experimental results.
机译：本研究的目的是在低循环和准静态疲劳寿命范围内测试基于连续损伤力学（CDM）方法的经典Lemaitre模型。利用在可变振幅载荷下进行的C45钢（根据AISI：1045钢）的实验测试结果进行了研究。加载程序具有两步特征，并且包括不同长度的循环块和R = -1系数。疲劳寿命是根据Lemaitre模型从疲劳测试过程中通过实验获得的应力和应变历史记录计算得出的。将结果与实验测试结果进行比较，并与使用基于Palmgren-Miner损伤总和假设的传统疲劳方法计算的疲劳寿命进行比较。 C45钢疲劳寿命计算结果的实验​​测试表明，使用连续应力记录法记录的应力和应变，与其余方法相比，可以更好地预测疲劳寿命。该研究还包含许多实验结果的详细分析。

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