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首页> 外文会议>Conference of the International Committee on Aeronautical Fatigue and Structural Integrity >Spectrum Truncation or Spectrum Compression?: When time and money matters and nothing less than a fraction of the original spectrum is acceptable
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Spectrum Truncation or Spectrum Compression?: When time and money matters and nothing less than a fraction of the original spectrum is acceptable

机译：频谱截断或频谱压缩？：时间和金钱的重要事项，没有什么比一小部分原始谱是可接受的

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摘要

The practicalities of structural fatigue testing limit the fidelity of the cyclic load history that can be applied to a test structure. Testing is therefore a compromise between fatigue damage fidelity and test economy. Traditionally, spectrum truncation has involved the removal of the smallest cycles in the spectrum which are assumed to contribute the least damage to the test article. The authors of this paper propose a more sophisticated approach using material damage models to achieve far higher reductions in spectrum size. Rather than truncating small cycles, this paper presents a new concept to compress the spectrum by preserving the damage content of a spectrum. This is achieved by replacing small groups of load cycles with a single cycle with equivalent damage. Three methods to compress spectra are proposed, based on: cycle omission; the strain-life method; and directly using a crack growth model. Preliminary work assessing the spectrum compression algorithms is presented along with an example application. This investigation found that the spectrum compression by strain-life and direct crack growth effectively achieved over 90% reduction in the number of cycles, a level of reduction not possible by a process of small cycle omission alone.
机译：结构疲劳测试的实用性限制了可以应用于测试结构的循环负载历史的保真度。因此，测试是疲劳损害保真度和测试经济之间的折衷。传统上，频谱截短已经涉及去除假设对测试制品最不损害的频谱中最小循环。本文的作者提出了一种更复杂的方法，使用材料损坏模型来实现频谱尺寸的较高减少。本文而不是截断小周期，而不是通过保留光谱的损坏内容来压缩光谱的新概念。这是通过用同等损坏的单个循环替换小组负载循环来实现的。提出了三种压缩光谱的方法，基于：循环遗漏;菌株寿命方法;并直接使用裂缝增长模型。评估频谱压缩算法的初步工作以及示例应用程序呈现。该研究发现，通过应变 - 寿命和直接裂纹增长的频谱压缩有效地实现了循环次数的90％以上超过90％，仅通过单独的小循环遗漏的过程不可能降低。

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