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| 电力导线腐蚀疲劳性能试验研究和数值模拟 |
| Experimental Study and Numerical Simulation of Corrosion Fatigue Performance of Power Wire |
| 投稿时间：2020-10-10 修订日期：2020-11-12 |
| DOI： |
| 中文关键词: 电力导线 腐蚀疲劳 疲劳寿命 损伤演化 |
| 英文关键词: Power Wire Corrosion Fatigue Fatigue Life Damage Evolution |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）, |
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| 中文摘要: |
| 电力导线长期承受疲劳荷载和环境侵蚀作用，腐蚀介质和疲劳荷载共同作用所导致的导线的腐蚀疲劳失效是其典型的失效模式之一。本文设计了一套新型的试验装置来对多根试样同步施加疲劳脉动荷载，通过实验研究了电力导线缺口试样在腐蚀环境下的疲劳特性，获得了疲劳S-N曲线。为了进一步考察试样内部在腐蚀疲劳失效过程中内部的损伤演化情况，基于商用软件ABAQUS，利用试验结果获得疲劳疲劳损伤本构模型的参数，编写UMAT程序实现损伤演化过程的可视化并进一步获得导线的计算寿命。将试验结果和数值模拟结果加以比对，验证模拟结果的准确性。结果表明：本文设计的新型疲劳试验装置可实现对多组导线的多级同步脉动疲劳加载，可妥善考虑腐蚀介质与疲劳荷载的耦合作用，并大大缩短腐蚀疲劳试验的时长。提出的基于连续损伤力学和断裂力学结合的方法可实现导线疲劳损伤演化和腐蚀疲劳损伤演化过程的可视化，数值模拟与试验结果吻合良好。 |
| 英文摘要: |
| Power wire is subjected to the combined action of long-term fatigue loads and corrosive medium, therefore, corrosion fatigue failure is one of the typical failure modes. In this paper, a new type of test device was designed to apply the fatigue pulsation load synchronously to the multiple specimens. The fatigue characteristics of the notched wire specimens under corrosive medium were studied experimentally, and the fatigue S-N curve was obtained. In order to further investigate the damage evolution inside the specimen during the corrosion fatigue failure process, based on the commercial software ABAQUS, the parameters of the fatigue damage constitutive model were obtained by using the test results, and the UMAT program was written to realize the visualization of the damage evolution process and further obtain the calculation life of the wires. The experimental results were compared with the numerical simulation results to verify the accuracy of the simulation results. The results show that the new fatigue test device designed in this paper can realize synchronous pulsating fatigue loading of multiple wires and greatly shorten the duration of corrosion fatigue test, and the coupling effect of corrosive medium and fatigue load can be properly considered. The method based on the combination of continuous damage mechanics and fracture mechanics can realize the visualization of fatigue damage evolution and corrosion fatigue damage evolution of wire. The numerical simulation is in good agreement with the experimental results. |
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