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首页> 外文期刊>Journal of Applied Polymer Science >Crack initiation of natural rubber under high temperature fatigue loading
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Crack initiation of natural rubber under high temperature fatigue loading

机译：天然橡胶在高温疲劳载荷下的裂纹萌生

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摘要

Vulcanized natural rubber (NR) under quiescent thermal oxidation aging and high temperature fatigue loading with small strain amplitude was investigated by the infrared spectroscopy, scanning electron microscopy, and positron annihilation lifetime spectroscopy measurements. IR results demonstrated the thermal oxidation degradation process of vulcanized NR at 85°C. During high temperature fatigue loading, nanoscale cracks and voids that are generated by the combined impact of thermal oxidation and cyclic loading were detected. Further investigation suggests that the nucleation effect of dissolved vapor and gas in the low molecular weight domains of the NR under fatigue loading accounts for the appearance of nanocracks. This work provides some new insight into the crack initiation mechanism of NR during high temperature fatigue loading, which has not been clearly understood.
机译：通过红外光谱，扫描电子显微镜和正电子an没寿命光谱测量研究了静态热氧化老化和高温疲劳载荷下应变幅值较小的硫化天然橡胶。红外结果证明了硫化NR在85℃下的热氧化降解过程。在高温疲劳加载过程中，检测到由热氧化和循环加载的综合影响所产生的纳米级裂缝和空隙。进一步的研究表明，在疲劳载荷下，NR的低分子量区域中溶解的蒸气和气体的成核作用说明了纳米裂纹的出现。这项工作为高温疲劳载荷下的NR的裂纹萌生机理提供了一些新的见解，目前尚不清楚。

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