Effects of Aluminum and Temperature on the Tensile Mechanical Properties of Lithium‐Perchlorate/Polyvinyl Alcohol‐Based Electrically Controlled Solid Propellants,Propellants, Explosives, Pyrotechnics

当前位置： X-MOL 学术 › Propellants Explos. Pyrotech. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Effects of Aluminum and Temperature on the Tensile Mechanical Properties of Lithium‐Perchlorate/Polyvinyl Alcohol‐Based Electrically Controlled Solid Propellants
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2019-11-05 , DOI: 10.1002/prep.201900281
Zhicheng He ₁ , Zhixun Xia ₁ , Jianxin Hu ₂ , Likun Ma ₁ , Yang Li ₁

Affiliation

To study the mechanical properties of lithium‐perchlorate/polyvinyl alcohol‐based aluminized electrically controlled solid propellant (LP/PVA‐Al‐ECSP), the effects of Al particle size, grading, and content on the mechanical properties of the propellant at various temperatures were investigated. The uniaxial tensile experiments were conducted over the temperature range from −40 °C to +50 °C using universal testing machine with a crosshead speed of 100 mm min⁻¹. A scanning electron microscope (SEM) was employed to observe the fracture surface morphologies of the specimens. The results indicate that Al powder and temperature greatly affects the mechanical properties of the composite propellant. From experiments in which the size and the fine‐to‐coarse ratio of Al were changed at constant solid loading, the tensile strength and initial modulus of the propellant are improved with the increase of Al particle size and coarse‐to‐fine ratio at 25 °C. The increase in Al content improves the tensile strength and initial modulus of the propellant, whereas reduces the elongation. The results of experiments in which the temperature changed indicate that the tensile strength and initial modulus of the propellant are improved at low temperatures, whereas the mechanical properties of the propellants deteriorate at high temperatures. The elongation of the propellants is greatly reduced at low temperatures. The stress−strain curve of ECSP shows three regions at low temperatures and five regions at room temperature and high temperatures. The LP/PVA‐Al‐ECSP has poor tensile strength and initial modulus, whereas its elongation is extremely high at room temperature. The propellant with 5 μm Al to 65 μm Al ratio of 3/7 exhibits the best comprehensive mechanical properties.

中文翻译：

铝和温度对高氯酸锂/聚乙烯醇电控固体推进剂拉伸力学性能的影响

研究基于高氯酸锂/聚乙烯醇的铝化电控固体推进剂（LP / PVA-Al-ECSP）的机械性能，Al颗粒大小，等级和含量对各种温度下推进剂机械性能的影响被调查了。使用万能试验机在-40°C至+50°C的温度范围内进行单轴拉伸实验，十字头速度为100 mm min ^-1。使用扫描电子显微镜（SEM）观察样品的断裂表面形态。结果表明，铝粉和温度极大地影响了复合推进剂的力学性能。通过在恒定固含量下改变Al的大小和粗细比的实验，随着Al粒度和25的粗细比的增加，推进剂的拉伸强度和初始模量得到改善。 ℃。Al含量的增加改善了推进剂的抗张强度和初始模量，而降低了伸长率。温度变化的实验结果表明，在低温下，推进剂的拉伸强度和初始模量得到了改善，而推进剂的机械性能在高温下会降低。在低温下，推进剂的伸长率大大降低。ECSP的应力-应变曲线显示了低温下的三个区域以及室温和高温下的五个区域。LP / PVA-Al-ECSP的拉伸强度和初始模量很差，而在室温下的伸长率却非常高。Al / Al比例为5/65/3的推进剂具有最佳的综合机械性能。而其伸长率在室温下极高。Al / Al比率为5/65/65的推进剂具有最佳的综合机械性能。而其伸长率在室温下极高。Al / Al比例为5/65/3的推进剂具有最佳的综合机械性能。

更新日期：2020-03-22

点击分享查看原文

点击收藏

阅读更多本刊最新论文