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首页> 外文期刊>Journal of Applied Polymer Science >In situ SEM study of fatigue crack growth mechanism in carbon black-filled natural rubber
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In situ SEM study of fatigue crack growth mechanism in carbon black-filled natural rubber

机译：炭黑填充天然橡胶疲劳裂纹扩展机理的原位SEM研究

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A micro-tensile testing machine placed in the chamber of a scanning electron microscope is used to perform in situ fatigue tests on a 43 phr carbon black-filled cis-1,4-polyisoprene rubber; the crack tip is observed in real-time during crack propagation. These observations lead to a detailed description of the crack tip morphology; the crack front is a regular pattern of diamond- shaped zones delimited by extended straight ligaments. Fatigue crack growth is driven by the ligaments breakage, which occurs in all the zones of the crack front surface continuously in time but at different velocities. This phenomenon of nonlocalized damage explains initiation and limited propagation of branches which deviate from the main crack. All those mechanisms are sources of energy dissipation which explains the great fatigue properties of NR. Finally, from similar experiments conducted on styrene butadiene rubber, it is established that the peculiar morphology of the crack tip and mechanism of crack propagation in NR are due to strain-induced crystallization.
机译：使用置于扫描电子显微镜腔室中的微拉伸试验机对43 phr炭黑填充的顺式1,4-聚异戊二烯橡胶进行原位疲劳测试;裂纹扩展过程中实时观察到裂纹尖端。这些发现导致对裂纹尖端形态的详细描述。裂纹前沿是规则的菱形区域，由延伸的直韧带界定。疲劳裂纹的增长是由韧带断裂带动的，韧带断裂是在裂纹前表面的所有区域中连续不断地以不同的速度发生的。这种非局部损坏的现象解释了偏离主裂纹的分支的萌生和有限的传播。所有这些机制都是能量耗散的来源，这说明了NR的巨大疲劳特性。最后，通过对丁苯橡胶进行的类似实验，可以确定，NR中裂纹尖端的特殊形态和裂纹扩展的机理是由于应变诱导的结晶。

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