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Rubber fatigue evaluation for antivibration products and an S–N curve with a scatter band of 0.8
Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications ( IF 2.4 ) Pub Date : 2021-05-22 , DOI: 10.1177/14644207211018238
Robert Keqi Luo 1
Affiliation  

Rubber antivibration products are widely used in engineering structures. An accurate evaluation on fatigue performance is a challenging issue during a design procedure. In this article, an effective stress approach was applied to multi-directional snubbing (MDS) mounts, AE2 and AE42 specimens. It was demonstrated that observed fatigue cracks were initiated at a place where the maximum effective stress was located. There were confirmed strong correlations between the effective stress and the number of failed cycles: R2 = 0.994 for AE2 with eight fatigue cases, R2 = 0.955 for AE42 with 16 cases and R2 = 0.917 for both AE2 and AE42 with 24 cases. A valuable S–N curve (covering from 2 × 102 to 3 × 106 cycles) of rubber (SBR with 67 hardness) was obtained (a scatter-band range of 0.8 with an average standard deviation of 14.3%). The scatter band includes both natural fatigue scattering and criterion accuracy. Less than 10% CPU time, compared with the critical plane search method, would only be required for evaluation on a fatigue case of a two-dimensional solid. These findings have shown that the proposed approach is reliable and can be considered in a suitable fatigue design stage. As the presented criterion was validated in limited contexts, more cases in antivibration design are required to support this approach.



中文翻译:

防振产品的橡胶疲劳评估以及散射带为0.8的S–N曲线

橡胶防振产品广泛应用于工程结构。在设计过程中,对疲劳性能的准确评估是一个具有挑战性的问题。在本文中,一种有效的应力方法被应用于多方向减振(MDS)支架,AE2和AE42标本。结果表明,观察到的疲劳裂纹是在最大有效应力所在的位置开始的。确认有效应力与失效循环数之间存在很强的相关性: AE2在8例疲劳案例中的R 2 = 0.994  ,AE42在16例案例中的R 2 = 0.955, AE2和AE42在24例案例中R 2 = 0.917。一条有价值的SN曲线(覆盖范围从2×10 2到3×10 6获得了橡胶(硬度为67的SBR)的循环数(分散带范围为0.8,平均标准偏差为14.3%)。散射带既包括自然疲劳散射,也包括标准精度。与临界平面搜索方法相比,仅需要少于10%的CPU时间来评估二维实体的疲劳情况。这些发现表明,所提出的方法是可靠的,并且可以在适当的疲劳设计阶段进行考虑。由于所提出的标准在有限的环境中得到了验证,因此在抗振设计中需要更多的案例来支持这种方法。

更新日期:2021-05-22
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