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Cavitation damage as a result of polyfractional erosion process
Wear ( IF 5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.wear.2020.203369
Janusz Steller

Abstract The paper reports on the progress in development of the fractional model of cavitation erosion kinetics. The model was proposed by the author in the end of nineties as a tool aimed at overcoming the incompatibility in cavitation erosion resistance assessments based on tests conducted at different facilities. The methodology proposed assumes testing materials under different conditions and describing their resistance to each load fraction under consideration by parameters of an analytic function modelling the monofractional cumulative erosion curves. A differential superposition law is used to derive the erosion curve under a polyfractional impingement. The fractional model has been used to retrieve cavitation load at test facilities involved in the International Cavitation Erosion Test project and to predict erosion at a rotating disk rig basing on the results of the cavitation tunnel tests. The technique of determining the erosive load basing on the pressure pulses amplitude distribution is currently considered the main weakness of the approach. Statistical analysis of pit distribution in a soft material in the initial period of erosion and the use of research results of LEGI lab (Grenoble, France) is proposed as a solution. Some further research aimed at refining the methodology is suggested as well.

中文翻译:

多部分侵蚀过程导致的气穴损坏

摘要 本文报道了空化侵蚀动力学分数模型的发展进展。该模型是作者在 90 年代末提出的一种工具,旨在克服基于在不同设施进行的测试进行的抗气蚀评估中的不兼容性。所提出的方法假设在不同条件下测试材料,并通过模拟单分数累积侵蚀曲线的解析函数的参数来描述它们对所考虑的每个载荷分数的抵抗力。微分叠加定律用于推导出多分数冲击下的侵蚀曲线。分数模型已用于在参与国际空化侵蚀测试项目的测试设施中检索空化载荷,并根据空化隧道测试的结果预测转盘钻机的侵蚀。基于压力脉冲幅度分布确定侵蚀载荷的技术目前被认为是该方法的主要弱点。提出了对侵蚀初期软质材料中凹坑分布的统计分析和利用 LEGI 实验室(法国格勒诺布尔)的研究成果作为解决方案。还建议进行一些旨在完善该方法的进一步研究。基于压力脉冲幅度分布确定侵蚀载荷的技术目前被认为是该方法的主要弱点。提出了对侵蚀初期软质材料中凹坑分布的统计分析和利用 LEGI 实验室(法国格勒诺布尔)的研究成果作为解决方案。还建议进行一些旨在完善该方法的进一步研究。基于压力脉冲幅度分布确定侵蚀载荷的技术目前被认为是该方法的主要弱点。提出了对侵蚀初期软质材料中凹坑分布的统计分析和利用 LEGI 实验室(法国格勒诺布尔)的研究成果作为解决方案。还建议进行一些旨在完善该方法的进一步研究。
更新日期:2020-09-01
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