Abstract
This study aims to investigate the effect of loading factors on damage accumulation under variable amplitude vibration (VAV). Vibration fatigue experiments are conducted under both constant amplitude vibration (CAV) and VAV loading cases. The effects of loading sequence, loading amplitude, stress difference, and cyclic ratio on damage accumulation are analyzed. It is found the damage accumulation rate is strongly affected by the loading sequence: the fatigue lives can be ranked in descending order as the one-way low-high loading, the constant loading, and the one-way high-low loading. The effect of stress difference on damage accumulation is not significant, while the damage accumulation varies a lot according to the cyclic ratio of the two-level loading blocks and the fatigue life could be extended by increasing the lower loading cycles. Comparing with linear and double linear damage rules, models based on nonlinear damage rules have apparent advantages in predicting accuracy in VAV conditions, in which the nonlinear continuous damage model has the best compromise between availability and precision.
Highlights
Vibration fatigue under variable amplitude loading is one of the common failure modes of engine structures [1,2]
It has been validated that the fatigue damage is influenced by loading factors, e.g., loading sequence, loading amplitude, load difference, and cyclic ratio
The results of the constant amplitude vibration (CAV) tests and the S-N curve of the Ti–6Al–4V are given in Table 1 and Figure 4, respectively
Summary
Vibration fatigue under variable amplitude loading is one of the common failure modes of engine structures [1,2]. Zhu et al.containing [14] proposed microstructure of carbon steel to simulate the crack growth process, which shows an acceleration a new damage accumulation model based on Miner rule to consider the coupled damage due to effect on short-crack growth rate due to load overload. It isItfound thatfrom overload effectsanalyses on cyclicthat plasticity and microcrack condition are cansignificant affect theand damage accumulation differentshear ways.strain It would be more initiation the local stress and in maximum amplitudes are useful in appropriate to study the correlated effect of multiple loading factors on the fatigue damage predicting crack initiation. It is clear from the above analyses that the variable loading condition can comprehensively.
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