Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure,Propellants, Explosives, Pyrotechnics

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Experimental Research on Tensile Mechanical Properties of NEPE Propellant under Confining Pressure
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2020-09-20 , DOI: 10.1002/prep.201900412
Hui Li ₁ , Shi‐Xin Wang _{1,

2} , Meng Li ₃ , Jin‐Sheng Xu ₁ , Xing‐Gui Fan ₁ , Xiong Chen ₁

Affiliation

To study the tensile mechanical properties of the Nitrate Ester Plasticized Polyether (NEPE) propellant under varying confining pressure conditions, uniaxial tensile tests were conducted under different strain rates (from 0.0006667 s⁻¹ to 0.06667 s⁻¹) and confining pressure conditions (from relative atmospheric pressure up 5.4±0.03 MPa) using a new‐designed confining pressure testing machine. Scanning electron microscopy (SEM) was employed to observe the tensile fracture surfaces. The mechanical properties and damage processes of the NEPE propellant under varying confining pressure conditions were studied and analysed. The results indicate that the mechanical properties of propellant materials are remarkably influenced by the varying confining pressure conditions. The ultimate strain and maximum tensile stress increase with increasing confining pressure. Moreover, the maximum tensile stress present a linear‐log relationship with the strain rate under various confining pressure conditions. Yet, the confining pressure has no obvious effect on the initial elastic modulus. The reason for the change of the mechanical properties of the NEPE propellant is that confining pressure delays the initiation and development of damage under the tensile loading. Based on the time‐pressure superposition principle (TPSP), the master curve of maximum tensile strength of the NEPE propellant was constructed. Furthermore, the results can provide a theoretical foundation for the analysis of the structural integrity of propellant grains of a SRM under ignition conditions. Finally, a constitutive model considering compressibility of propellant materials can be constructed.

中文翻译：

封闭压力下NEPE推进剂拉伸力学性能的实验研究

为了研究在不同围压条件下硝酸酯增塑聚醚（NEPE）推进剂的拉伸力学性能，在不同的应变速率（0.0006667 s ^-1至0.06667 s ^-1）下进行了单轴拉伸试验。）和使用新设计的围压测试机进行围压条件（从相对大气压升高到5.4±0.03 MPa）。使用扫描电子显微镜（SEM）观察拉伸断裂表面。研究和分析了NEPE推进剂在不同围压条件下的力学性能和破坏过程。结果表明，推进剂材料的机械性能受到围压条件变化的显着影响。极限应变和最大拉伸应力随着围压的增加而增加。此外，在不同的围压条件下，最大拉应力与应变率呈线性对数关系。然而，围压对初始弹性模量没有明显影响。NEPE推进剂机械性能改变的原因是，限制压力会延迟拉伸载荷下损伤的产生和发展。根据时间-压力叠加原理（TPSP），绘制了NEPE推进剂最大拉伸强度的主曲线。此外，该结果可为在点火条件下分析SRM推进剂颗粒的结构完整性提供理论依据。最后，可以构建考虑推进剂材料可压缩性的本构模型。绘制了NEPE推进剂最大抗张强度的主曲线。此外，该结果可为分析SRM着火条件下推进剂颗粒的结构完整性提供理论依据。最后，可以构建考虑推进剂材料可压缩性的本构模型。绘制了NEPE推进剂最大抗张强度的主曲线。此外，该结果可为分析SRM着火条件下推进剂颗粒的结构完整性提供理论依据。最后，可以构建考虑推进剂材料可压缩性的本构模型。

更新日期：2020-11-05

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