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Normalized spectral damage of a linear system over different spectral loading patterns

机译:线性系统在不同光谱负载模式下的归一化光谱损伤

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摘要

Spectral fatigue damage is affected by different loading patterns; the damage may be accumulated in a different manner because the spectral pattern has an influence on stresses or strains. The normalization of spectral damage with respect to spectral loading acceleration is a novel solution to compare the accumulated fatigue damage over different spectral loading patterns. To evaluate the sensitivity of fatigue damage over different spectral loading cases, a simple notched specimen is used to conduct a uniaxial vibration test for two representative spectral patterns-random and harmonic-between 30 and 3000 Hz. The fatigue damage to the simple specimen is analyzed for different spectral loading cases using the normalized spectral damage from the measured response data for both acceleration and strain. The influence of spectral loading patterns is discussed based on these analyses.
机译:光谱疲劳损伤受不同加载方式的影响;由于光谱图样会对应力或应变产生影响,因此损坏可能以不同的方式累积。频谱损伤相对于频谱加载加速度的归一化是一种比较不同频谱加载模式下累积疲劳损伤的新颖解决方案。为了评估在不同频谱载荷情况下疲劳损伤的敏感性,使用一个简单的缺口试样对30和3000 Hz之间的两个代表性频谱模式-随机和谐波进行单轴振动测试。使用来自加速度和应变的测量响应数据的归一化光谱损伤,分析了在不同光谱载荷情况下对简单样本的疲劳损伤。基于这些分析,讨论了频谱加载模式的影响。

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