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Inside Cover: Sensitivity and Phase Transition of Heated ϵ ‐CL‐20 in Drop‐Weight Impact Test (Prop., Explos., Pyrotech. 11/2018)
Author(s) -
Zheng Xue,
Yu Shaojun,
Wen Wen,
Wen Yushi,
Wang Pei,
Lan Lingang,
Dai Xiaogan,
Han Yong,
Li Jingming,
Li Yubin
Publication year - 2018
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201881102
Subject(s) - phase transition , phase (matter) , materials science , drop (telecommunication) , sensitivity (control systems) , crystal (programming language) , pallet , thermal , crystal structure , analytical chemistry (journal) , crystallography , composite material , thermodynamics , mechanics , chemistry , physics , structural engineering , engineering , mechanical engineering , chromatography , organic chemistry , electronic engineering , computer science , programming language
The cover picture shows the polymorphic transformation of CL‐20 in a steel‐walled pallet with a heating system and its effect on the impact sensitivity (middle section). Heat makes the volume of Cl‐20 crystal increase and cause the ε phase transform to γ phase, then crystal cracks (upper section). The impact sensitivity of heated CL‐20 decreases, and small size crystal is more sensitive at 160 °C than large size ascribing to its faster react rate and more ε phase (as impurity) in its γ phase. The dense and rigid PDA shell can constrain the thermal expansion of crystal, then retard the phase transition form ε phase to γ phase (lower section). Details are discussed in the article by Xue Zheng et al. on page 1164 ff.