摘要
为建立考虑老化效应的改性双基(CMDB)推进剂延伸率主曲线,开展了不同测试温度(233.15 K、253.15 K、273.15 K、283.15 K、298.15 K、323.15 K)和应变率(3.3×10^(-4)s^(-1)、3.3×10^(-3)s^(-1)和3.3×10^(-2)s^(-1))下不同高温加速老化时间后改性双基推进剂单轴拉伸试验,根据实验结果获得了最大延伸率,结合扫描电子显微镜实验分析了老化对最大延伸率的影响,基于现有理论建立了考虑老化效应的延伸率主曲线模型。研究结果表明:随着老化时间的延长,改性双基推进剂最大延伸率单调递减,拉伸断面内细观损伤逐渐加重,老化时间对材料的温度特性和率相关特性影响较小,考虑老化效应的延伸率主曲线模型可以较好地描述不同老化时间下延伸率主曲线。研究结果可为不同老化时间下固体火箭发动机药柱结构完整性分析奠定基础。
In order to establish the elongation criterion of composite modified double-base(CMDB)propellant considering aging effect,uniaxial tensile tests of CMDB propellant were carried out under different test temperatures(233.15 K,253.15 K,273.15 K,283.15 K,293.15 K,323.15 K)and strain rates(3.3×10^(-4)s^(-1),3.3×10^(-3)s^(-1),3.3×10^(-2)s^(-1)).According to the experimental results,the maximum elongation was obtained,and the mechanism of the effect of aging on the maximum elongation was analyzed by scanning electron microscope(SEM).Based on the existing theory,the master curve model of elongation considering aging effect was established.The results show that with the increase of aging time,the maximum elongation of CMDB propellant decreases monotonously,the meso-damage in the tensile section was gradually aggravated,and the aging time has little effect on the temperature and rate-dependent properties of the material.the master curve model of elongation considering aging effect can well describe the master curve of elongation under different aging time.The research results can lay a foundation for the structural integrity analysis of solid rocket motor grain under different aging time.
作者
刘家铭
邓恒
杨春庆
朱文革
杨保雨
LIU Jiaming;DENG Heng;YANG Chunqing;ZHU Wenge;YANG Baoyu(Xi'an Modern Control Technology Research Institute,Xi'an 710065,China)
出处
《弹箭与制导学报》
北大核心
2025年第5期761-768,共8页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
改性双基推进剂
老化
最大延伸率
主曲线
影响机理
modified double-base propellant
aging
maximum elongation
master curve
influence mechanism
