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首页> 外文期刊>Strength, fracture and complexity: an international journal >Law of fracture life under creep-fatigue interactive conditions for Ni-base directionally solidified superalloy based on non-equilibrium science (the effect of stress holding time)
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Law of fracture life under creep-fatigue interactive conditions for Ni-base directionally solidified superalloy based on non-equilibrium science (the effect of stress holding time)

机译：基于非平衡科学的镍基定向凝固高温合金蠕变疲劳交互条件下的断裂寿命规律（应力保持时间的影响）

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摘要

Ni-base directionally solidified superalloy are used under complex conditions of high temperature creep and fatigue interaction. Under these conditions, the characteristics of load frequency for fracture life show a nonlinear behavior, and these characteristics show various features depending on material, temperature and stress holding time. In this study, crack growth tests were conducted under creep-fatigue interactive conditions with stress holding time, t_H using the in-situ observational system for directionally solidified Ni-base superalloy CM247LC. To characterize the load frequency of fracture life for CM247LC, the separate estimation of cyclic dependent from time dependent mechanisms was conducted. Additionally, a developed representation of the characteristic of fracture life under the conditions of creep fatigue interaction based on non-equilibrium science and chaos theory was proposed. Furthermore, verification of the established law of predicting the fracture life under creep-fatigue interactive conditions was conducted.
机译：镍基定向凝固高温合金用于高温蠕变和疲劳相互作用的复杂条件下。在这些条件下，断裂寿命的负载频率特性表现出非线性行为，并且这些特性表现出取决于材料，温度和应力保持时间的各种特性。在这项研究中，使用定向凝固镍基高温合金CM247LC的原位观察系统，在蠕变疲劳相互作用条件下，应力保持时间为t_H时，进行了裂纹扩展测试。为了表征CM247LC断裂寿命的负载频率，进行了与时间相关的机制对周期相关的单独估计。此外，还提出了一种基于非平衡科学和混沌理论的蠕变疲劳相互作用条件下断裂寿命特征的表征方法。此外，验证了在蠕变疲劳相互作用条件下预测断裂寿命的既定规律。

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