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Influence of Strain Rate on Mechanical Properties of HTPE/PCL Propellant Applying to Wide Temperature Range
Author(s) -
Yuan Shen,
Zhang Bowen,
Wen Xiaomu,
Chen Keke,
Jiang Shengkun,
Luo Yunjun
Publication year - 2021
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.202000238
Subject(s) - materials science , dewetting , propellant , composite material , ultimate tensile strength , strain rate , brittleness , atmospheric temperature range , elongation , scanning electron microscope , modulus , thermodynamics , chemistry , wetting , physics , organic chemistry
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.