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Influence of Strain Rate on Mechanical Properties of HTPE/PCL Propellant Applying to Wide Temperature Range
Propellants, Explosives, Pyrotechnics ( IF 1.8 ) Pub Date : 2021-02-10 , DOI: 10.1002/prep.202000238
Shen Yuan 1, 2 , Bowen Zhang 1, 2 , Xiaomu Wen 1, 2 , Keke Chen 1, 2 , Shengkun Jiang 1, 2 , Yunjun Luo 1, 2
Affiliation  

The mechanical properties of hydroxyl‐terminated polyether/poly(ϵ‐caprolactone) (HTPE/PCL) propellant applying to the wide temperature range of −50 °C to 70 °C were investigated by uniaxial tensile test with different strain rates varying from 0.5 min−1 to 10 min−1. The scanning electron microscopy (SEM) was used to observe the fractured surface of HTPE/PCL propellant, and the dynamic mechanical analysis (DMA) was employed to analyze its strain induced crystallization at low temperature. It reveals that the temperature and strain rate have great influence on the mechanical properties of HTPE/PCL propellant. As the temperature increasing or the strain rate decreasing, the maximum tensile strength gradually reduces, but the elongation at break increases first and then decreases. The fracture of HTPE/PCL propellant changes from the part dewetting and brittle fracture at low temperature to the fracture caused by dewetting at high temperature. The master curves for mechanical properties of HTPE/PCL propellant at the wide temperature of −50 °C to 70 °C with the strain rate of 0.5 min−1 to 10 min−1 were obtained, the prediction of maximum tensile strength and elastic modulus can be achieved.

中文翻译:

应变速率对宽温度范围内HTPE / PCL推进剂力学性能的影响

羟基封端的聚醚的机械性能/聚(ε施加到宽的温度范围为-50℃至70℃的ε-己内酯)(HTPE / PCL)抛射剂通过单轴拉伸试验用不同的应变率从0.5分钟变研究-1至10分钟-1。用扫描电子显微镜(SEM)观察HTPE / PCL推进剂的断裂面,并用动态力学分析(DMA)分析其在低温下的应变诱导结晶。结果表明,温度和应变速率对HTPE / PCL推进剂的力学性能影响很大。随着温度升高或应变率降低,最大抗拉强度逐渐降低,但断裂伸长率先升高,然后降低。HTPE / PCL推进剂的断裂从低温下的部分润湿和脆性断裂转变为高温下的润湿引起的断裂。HTPE / PCL推进剂在−50°C至70°C的宽温度下,应变速率为0.5 min -1时的机械性能主曲线获得10min -1的值,可以实现最大抗拉强度和弹性模量的预测。
更新日期:2021-03-31
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