NEPE固体推进剂的低频疲劳特性
V512; 为研究低频疲劳加载下硝酸酯增塑聚醚(nitrate ester plasticized polyether,NEPE)固体推进剂的损伤演化过程,获得疲劳加载历史对NEPE固体推进剂拉伸力学性能的影响规律,基于电子万能试验机开展了NEPE固体推进剂低频疲劳试验和定应变率单轴拉伸试验,并结合疲劳加载后试件的细观形貌图与试验曲线,进一步分析微细观结构损伤对NEPE固体推进剂宏观力学行为的作用机理.结果表明,低频疲劳载荷会使NEPE固体推进剂基体出现微裂纹,使其基体/颗粒界面出现空穴,进而产生不可忽视的应力软化行为与残余应变;疲劳加载过程中及疲劳加载后,NEPE固体推进剂宏观力学性能的衰减...
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| Published in | 国防科技大学学报 Vol. 47; no. 1; pp. 31 - 41 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
国防科技大学空天科学学院,湖南长沙 410073
01.02.2025
火箭军工程大学,陕西西安 710025 空天任务智能规划与仿真湖南省重点实验室,湖南长沙 410073%国防科技大学空天科学学院,湖南长沙 410073 空天任务智能规划与仿真湖南省重点实验室,湖南长沙 410073 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1001-2486 |
| DOI | 10.11887/j.cn.202501003 |
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| Abstract | V512; 为研究低频疲劳加载下硝酸酯增塑聚醚(nitrate ester plasticized polyether,NEPE)固体推进剂的损伤演化过程,获得疲劳加载历史对NEPE固体推进剂拉伸力学性能的影响规律,基于电子万能试验机开展了NEPE固体推进剂低频疲劳试验和定应变率单轴拉伸试验,并结合疲劳加载后试件的细观形貌图与试验曲线,进一步分析微细观结构损伤对NEPE固体推进剂宏观力学行为的作用机理.结果表明,低频疲劳载荷会使NEPE固体推进剂基体出现微裂纹,使其基体/颗粒界面出现空穴,进而产生不可忽视的应力软化行为与残余应变;疲劳加载过程中及疲劳加载后,NEPE固体推进剂宏观力学性能的衰减均与最大加载应变呈指数函数关系;低频疲劳载荷所造成的部分微观损伤可恢复,其余疲劳损伤能提升分子链取向重排能力,使材料出现疲劳强化现象. |
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| AbstractList | V512; 为研究低频疲劳加载下硝酸酯增塑聚醚(nitrate ester plasticized polyether,NEPE)固体推进剂的损伤演化过程,获得疲劳加载历史对NEPE固体推进剂拉伸力学性能的影响规律,基于电子万能试验机开展了NEPE固体推进剂低频疲劳试验和定应变率单轴拉伸试验,并结合疲劳加载后试件的细观形貌图与试验曲线,进一步分析微细观结构损伤对NEPE固体推进剂宏观力学行为的作用机理.结果表明,低频疲劳载荷会使NEPE固体推进剂基体出现微裂纹,使其基体/颗粒界面出现空穴,进而产生不可忽视的应力软化行为与残余应变;疲劳加载过程中及疲劳加载后,NEPE固体推进剂宏观力学性能的衰减均与最大加载应变呈指数函数关系;低频疲劳载荷所造成的部分微观损伤可恢复,其余疲劳损伤能提升分子链取向重排能力,使材料出现疲劳强化现象. |
| Abstract_FL | To investigate the damage evolution process of low-frequency fatigue-loaded NEPE(nitrate ester plasticized polyether)solid propellant and get the influence law of fatigue loading history on tensile mechanical properties of NEPE solid propellant,the NEPE solid propellant low-frequency fatigue tests and uniaxial tensile tests with constant strain rate were conducted by the electronic universal testing machine.Based on the microscopic morphology and testing curves of test piece after fatigue loading,the influential mechanism of microscopic and mesoscopic damage on the NEPE solid propellant macroscopic mechanical behavior was further analyzed.Results indicate that the NEPE solid propellant matrix microcracks and voids at the matrix/particle interface are induced by low-frequency fatigue loads,leading to nonnegligible stress-softening behavior and residual strain.During and after fatigue loading,the attenuations of macroscopic mechanical properties of NEPE solid propellant are all exponentially related to the maximum loading strain.Part of microscopic damage by low-frequency fatigue load can recover,while the remaining fatigue damage may enhance the molecular chain orientation ability,and thus lead to the fatigue-strengthening phenomenon in materials. |
| Author | 张大鹏 雷勇军 张文沁 申志彬 吴凡几 |
| AuthorAffiliation | 国防科技大学空天科学学院,湖南长沙 410073;空天任务智能规划与仿真湖南省重点实验室,湖南长沙 410073%国防科技大学空天科学学院,湖南长沙 410073;空天任务智能规划与仿真湖南省重点实验室,湖南长沙 410073;火箭军工程大学,陕西西安 710025 |
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| Author_FL | LEI Yongjun ZHANG Dapeng ZHANG Wenqin WU Fanji SHEN Zhibin |
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| DocumentTitle_FL | Low-frequency fatigue characteristics of NEPE solid propellant |
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| Keywords | 低频疲劳试验 微细观损伤 low-frequency fatigue tests NEPE推进剂 microscopic and mesoscopic damage NEPE propellant 疲劳损伤演化 evolution of fatigue damage |
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| Title | NEPE固体推进剂的低频疲劳特性 |
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