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Effects of Temperature and Strain Rate on the Dynamic Fracture Properties of HTPB Propellant
Author(s) -
Long Bing,
Chang Xinlong,
Hu Kuan,
Zhang Youhong
Publication year - 2015
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.201400151
Subject(s) - materials science , fracture toughness , propellant , composite material , split hopkinson pressure bar , fracture (geology) , strain rate , chemistry , organic chemistry
In order to study the influence of temperature and strain‐rate on HTPB propellant fracture capability under impact loading conditions, a dynamic fracture experiment at different temperatures was carried out by using the cracked straight‐through Brazilian disc (CSTBD) specimen on the split Hopkinson pressure bar (SHPB), and the dynamic initiation fracture toughness of the HTPB propellant was obtained. Experimental results indicate that the proposed dynamic fracture testing for the HTPB propellant is effective. The dynamic initiation fracture toughness is obviously sensitive to temperature and strain‐rate, and its value increases with decreasing temperature and increasing strain rate, and a linearity relationship exists between the fracture toughness and the logarithm of the strain rate, and the linearity also increases with increasing loading rate. A master curve of quadratic function for the fracture toughness was obtained.