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Review and application of Rainflow residue processing techniques for accurate fatigue damage estimation

机译:雨流残渣处理技术的回顾和应用,以准确估算疲劳损伤

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摘要

Most fatigue loaded structural components are subjected to variable amplitude loads which must be processed into a form that is compatible with design life calculations. Rainflow counting allows individual stress cycles to be identified where they form a closed stress-strain hysteresis loop within a random signal, but inevitably leaves a residue of open data points which must be post-processed. Comparison is made between conventional methods of processing the residue data points, which may be non-conservative, and a more versatile method, presented by Amzallag et al. (1994), which allows transition cycles to be processed accurately. This paper presents an analytical proof of the method presented by Amzallag et al. The impact of residue processing on fatigue calculations is demonstrated through the application and comparison of the different techniques in two case studies using long term, high resolution data sets. The most significance is found when the load process results in a slowly varying mean stress which is not fully accounted for by traditional Rainflow counting methods.
机译:大多数疲劳加载的结构部件承受可变振幅的载荷,必须将其加工成与设计寿命计算兼容的形式。雨流计数允许识别单个应力周期,在单个应力周期中它们形成一个随机信号内的闭合应力应变滞后回线,但不可避免地会留下必须进行后处理的开放数据点残差。比较了可能是非保守的处理残基数据点的常规方法和Amzallag等人提出的更为通用的方法。 (1994年),它可以准确地处理过渡周期。本文介绍了Amzallag等人提出的方法的分析证明。在两个使用长期,高分辨率数据集的案例研究中,通过应用和比较不同技术,证明了残渣处理对疲劳计算的影响。当载荷过程导致缓慢变化的平均应力时,发现最重要的意义,而传统的雨流计数方法并不能完全解决这一问题。

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