首页|Effect of neutral polymeric bonding agent on tensile mechanical properties and damage evolution of NEPE propellant

Effect of neutral polymeric bonding agent on tensile mechanical properties and damage evolution of NEPE propellant

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Introducing Neutral Polymeric bonding agents(NPBA)into the Nitrate Ester Plasticized Polyether(NEPE)propellant could improve the adhesion between filler/matrix interface,thereby contributing to the development of new generations of the NEPE propellant with better mechanical properties.Therefore,understanding the effects of NPBA on the deformation and damage evolution of the NEPE propellant is fundamental to material design and applications.This paper studies the uniaxial tensile and stress relaxation responses of the NEPE propellant with different amounts of NPBA.The damage evolution in terms of interface debonding is further investigated using a cohesive-zone model(CZM).Experimental results show that the initial modulus and strength of the NEPE propellant increase with the increasing amount of NPBA while the elongation decreases.Meanwhile,the relaxation rate slows down and a higher long-term equilibrium modulus is reached.Experimental and numerical analyses indicate that interface debonding and crack propagation along filler-matrix interface are the dominant damage mechanism for the samples with a low amount of NPBA,while damage localization and crack advancement through the matrix are predominant for the ones with a high amount of NPBA.Finally,crosslinking density tests and simulation results also show that the effect of the bonding agent is interfacial rather than due to the overall crosslinking density change of the binder.

Solid propellantBonding agentMechanical propertiesDamage evolutionCohesive-zone modelInterface debonding

M.Wubuliaisan、Yanqing Wu、Xiao Hou、Kun Yang、Hongzheng Duan、Xinmei Yin

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State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing,100081,PR China

The Fourth Institute of China Aerospace Science and Technology Corporation,Xi'an,710025,PR China

School of Aerospace Engineering,Beijing Institute of Technology,Beijing,100081,PR China

Science and Technology on Aerospace Chemical Power Laboratory,Hubei Institute of Aerospace Chemotechnology,Hubei,441003,PR China

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Joint key programs of National Natural Science Foundation of China

U22B20131

2024

10.1016/j.dt.2023.04.006

防务技术
中国兵工学会

防务技术

CSTPCD
影响因子：0.358
ISSN：2214-9147
年,卷(期)：2024.32(2)
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