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Effect of Pre‐Strain Aging on the Microdamage Properties of Composite Solid Propellant
Author(s) -
Zhou DongMo,
Wu HanXu,
Liu XiangYang,
Zhang PengJun,
Wang HuiYuan
Publication year - 2020
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.202000034
Subject(s) - propellant , dewetting , materials science , composite material , composite number , strain (injury) , strain energy density function , ultimate tensile strength , stress (linguistics) , stress–strain curve , deformation (meteorology) , structural engineering , chemistry , finite element method , medicine , linguistics , philosophy , organic chemistry , wetting , engineering
Accelerated aging tests under pre‐strain were conducted on HTPB‐based composite solid propellant with the goal of investigating the effect of pre‐strain aging on its microdamage properties. The tensile fracture morphologies, stress‐strain curve and dissipative energy density of propellant samples were analyzed. Results showed that there was no obvious dewetting macroscopically when the pre‐strain was less than 9 %, but the pre‐strain can still cause microdamage of propellant interface. The microdamage of propellant interface can be characterized by the critical dewetting strain, corresponded to pre‐strain by a linear law. The bonding performance between HTPB propellant matrix and solid filler was mainly affected by aging temperature. There was a critical temperature T C , For the HTPB propellant investigated in this study, the T C is between 65 °C and 70 °C. When aging temperature is below T C , there was no significant decrease in the overall levels of dissipated energy density, but decrease began significantly when the aging temperature is above T C .