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首页> 外文期刊>Fatigue & fracture of engineering materials and structures >Evaluation of plastic strain work and multiaxial fatigue life in CuZn37 alloy by means of thermography method and energy-based approaches of Ellyin and Garud
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Evaluation of plastic strain work and multiaxial fatigue life in CuZn37 alloy by means of thermography method and energy-based approaches of Ellyin and Garud

机译：通过热成像法和基于能量的Ellyin和Garud方法评估CuZn37合金的塑性应变功和多轴疲劳寿命

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In the case of multiaxial loading, different models are used for prediction of fatigue life. Usually, they are divided into 3 subgroups: stress-based for high-cycle regime, strain-based for low-cycle regime, and energy-based models, which are considered to be the most universal and applicable for both high-cycle and low-cycle regimes. The application of energy-based models requires knowledge of the energy dissipated during the plastic strain, as well as the elastic strain energy. Calculation of this energy in turn requires specification of stress and strain tensor components. Determination of the stresses acting in real objects is a complicated task, however. In this paper, an attempt was made to answer the question of whether thermography enables the determination of plastic strain energy in low-cycle uniaxial and multiaxial fatigue tests, including non-proportional loadings. The second question was whether it is possible to use this methodology for fatigue life prediction. For this purpose, a history of temperature changes was recorded during fatigue tests conducted on CuZn37 brass, using a thermographic camera. On this basis, the values of plastic strain energy density, dissipated in the fatigue loading cycle, were calculated next. These values were compared with the values calculated from the hysteresis loops, determined from force and torque measurements, together with strains measured with a biaxial extensometer. The strain energy density was further used for prediction of fatigue life with the application of 2 models: the energy-based model of Ellyin and a strain-based model, where the energy was used as a non-proportionality factor. The predicted fatigue lives were compared with experimental ones. The results can be considered as very satisfactory.
机译：在多轴载荷的情况下，使用不同的模型来预测疲劳寿命。通常，它们分为3个子组：高应力状态下基于应力的模型，低周期状态下基于应变的模型以及基于能量的模型，它们被认为是最通用的，适用于高周期和低载荷两种情况周期制度。基于能量的模型的应用需要了解塑性应变过程中耗散的能量以及弹性应变能。反过来，要计算此能量，需要指定应力和应变张量分量。然而，确定作用在真实物体上的应力是一项复杂的任务。在本文中，试图回答热成像技术是否能够确定低循环单轴和多轴疲劳测试（包括非比例载荷）中的塑性应变能的问题。第二个问题是，是否可以将这种方法用于疲劳寿命预测。为此，使用热像仪记录了在CuZn37黄铜上进行的疲劳测试过程中温度变化的历史。在此基础上，接下来计算在疲劳载荷循环中耗散的塑性应变能密度值。将这些值与从磁滞回线计算得出的值（由力和扭矩测量确定）以及使用双轴引伸计测量的应变进行比较。应变能密度通过2种模型的应用进一步用于预测疲劳寿命：Ellyin的基于能量的模型和基于应变的模型，其中能量用作非比例因子。将预测的疲劳寿命与实验寿命进行了比较。结果可以认为是非常令人满意的。

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