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Influence of material stress-strain characteristics on thermomechanical fatigue analysis of IN100 superalloy

机译：材料应力应变特性对IN100高温合金热机械疲劳分析的影响

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Isothermal uniaxial cyclic loading experiments have been conducted on specimens of the nickel-based superalloy IN100 at selected temperatures in the range 600-1000℃. Power-law stress-strain relations based on plastic strain (Ramberg-Osgood), total strain and their bilinear equivalents have been used to describe the behaviour. In addition, uniaxial thermomechanical fatigue (TMF) tests have been performed on tubular specimens of the material over the temperature range 650-1050℃. The aim of these tests was to model the response during thermal shock experiments involving rapid heating and cooling cycles between 200℃ and 1100℃. Some transient tests have also been carried out on blade-shaped single-wedge specimens of IN100 to simulate the type of thermal fatigue (TF) cycle experienced by turbine blades during service. A finite element sensitivity analysis has been undertaken to predict the results of both the TMF and TF tests using the two different bilinear descriptions of the isothermal cyclic stress-strain response of IN100. Good agreement between the calculations and the TMF experimental results is obtained whichever bilinear relation is chosen.
机译：对镍基高温合金IN100的试样在600-1000℃的选定温度下进行了等温单轴循环加载实验。基于塑性应变（Ramberg-Osgood），总应变及其双线性等价物的幂律应力-应变关系已用于描述行为。此外，还对材料的管状试样在650-1050℃的温度范围内进行了单轴热机械疲劳（TMF）测试。这些测试的目的是模拟热冲击实验中的响应，该响应涉及200℃至1100℃之间的快速加热和冷却循环。还对IN100叶片形单楔样品进行了一些瞬态测试，以模拟涡轮叶片在使用过程中所经历的热疲劳（TF）循环类型。使用IN100的等温循环应力-应变响应的两种不同的双线性描述，已经进行了有限元灵敏度分析，以预测TMF和TF测试的结果。无论选择哪种双线性关系，都可以使计算结果与TMF实验结果保持良好的一致性。

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