Analysis of Low Temperature Anti-Cracking Property of Epoxy Materials for Cable Intermediate Joints

Jie Qiao, Yin Li,Chong Zhang, Weiyou Yang,Yanfeng Gao, Zhenyu Li,Yi Lu, Jiabei He, Youwen Chen, Lijian Yang,Kun Wang,Yun Chen

Journal of physics(2023)

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摘要
Abstract In this paper, multi-channel strain sensors are used to in-situ monitor the changes of strain with temperature under low temperatures for different stress angles in epoxy cladded metal inserts and the low temperature anti-cracking performances of the epoxy materials used for cable intermediate joint were analyzed. Compared with the foreign epoxy EP-0, the self-prepared toughed epoxy EP-1 has higher tensile strength, larger elongation at break and smaller modulus, showing a stronger toughness. The glass transition temperature of EP-0 and EP-1 epoxy materials are approximately the same. Besides, although the epoxy cladded metal inserts for EP-0 and EP-1 were both uncracked and intact when the temperature decreased from 0 to -70 °C, the strain and the stress at the stress angle R2 of EP-0 increased more rapidly with the decrease of the temperature than that of EP-1, which can be inferred that the cracking temperature of EP-0 is lower than that of EP-1. Thus, the low-temperature anti-cracking performance of self-made toughed epoxy material is better than that of commonly used foreign epoxy material.
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关键词
epoxy materials,joints,cable,anti-cracking
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