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Characterisation of creep behaviour using the power law model in copper alloy

机译:用铜合金幂律模型表征蠕变行为

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摘要

This paper presents a numerical strategy for the characterisation of the creep behaviourudmodel of the copper alloy, which is widely used in aircraft applications under creepudconditions. The high possibility of the material failing, while operating under load at anudelevated temperature, has led to the important study of the creep lifetime predictionudanalysis, by presenting the Norton’s rule based on the Power-law model to describe theudsecondary creep behaviour of the material. In order to demonstrate the nature of the creepudformulation, the SOL 400 modules from MSC Nastran 2014 are implemented in order toudconduct the uniaxial tensile test in 2000 N of applied load and 473 K of temperatureudcondition. As a result, the exponential curve is formed from the relationship of the creepudstrain rate and stress, with a 5.1% error based on the value of the stress exponent, n,udbetween the simulation and experimental results and this was still be acceptable becauseudit was relatively small due to the formulation in the simulation. Consequently, a relationudof the creep rate curve can then be plotted with respect to the load steps and the variationudpatterns due to the stress factor also being discussed. Therefore, the results show a goodudagreement, which indicates the capability of this model to give an accurate and preciseudestimation of the secondary creep behaviour of the materials.ud
机译:本文提出了表征铜合金蠕变行为 udmodel的数值策略,该模型已广泛应用于飞机在蠕变 ud情况下的应用。材料在高负荷,过高温度下工作时发生故障的可能性很高,因此通过提出基于幂律模型的诺顿定律描述二次蠕变,对蠕变寿命预测分析进行了重要研究。材料的行为。为了证明蠕变的性质,实施了MSC Nastran 2014的SOL 400模块,以便在2000 N的外加载荷和473 K的温度/过高条件下进行单轴拉伸试验。结果,由蠕变/非应变率与应力的关系形成了指数曲线,基于模拟和实验结果之间的应力指数值n,有5.1%的误差,这仍然是可以接受的由于模拟中的公式, udit相对较小。因此,然后可以相对于载荷阶跃绘制蠕变速率曲线的关系 ud,并且还讨论了由于应力因子引起的变化 udpattern。因此,结果显示出良好的一致性,表明该模型能够对材料的次级蠕变行为进行准确而精确的估算。

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