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Cyclic tensile tests were conducted under stress-controlled conditions to address the issue of fatigue damage characterization in high-energy nitrate ester plasticized polyether(NEPE)solid propellants after long-term highway transportation. The dissipated pseudo-strain energy was adopted as the damage factor for the fatigue damage process of NEPE solid propellants. The fatigue damage evolution process was regarded as a superposition of the damages from creep, tensile-compressive fatigue, and fracture. A fatigue damage evolution model for NEPE solid propellants was constructed, and parameter analyses were conducted. The results indicate that NEPE solid propellants exhibit a significant stress-strain hysteresis characteristic, with strain lagging behind stress under stress-controlled cyclic loading, accompanied by energy dissipation phenomena. The defined damage factor can effectively quantify the damage evolution process. The fatigue damage evolution model can precisely characterize the three growth stages of NEPE solid propellants under cyclic loading, namely decay, steady-state, and accelerated growth. The maximum loading stress plays a decisive role in fatigue damage evolution. When the maximum loading stress decreases, the dominant factor in damage evolution gradually shifts from creep damage to tensile-compressive fatigue damage.
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Basic Information:
DOI：10.20189/j.cnki.CN/61-1527/E.202601005
China Classification Code:V512
Citation Information:
[1]WU Fanji,ZHANG Wenqin,ZHANG Dapeng ,et al.Fatigue Damage Evolution Model for NEPE Solid Propellant Based on Dissipated Pseudo-Strain Energy[J].Journal of Rocket Force University of Engineering,2026,40(01):46-55.DOI:10.20189/j.cnki.CN/61-1527/E.202601005.
Fund Information:
固体推进全国重点实验室研究基金项目（2024020404）