空间电子辐照下星用热缩套管力学性能退化试验研究

为掌握星用热缩套管的力学性能在空间带电粒子辐射环境中的退化情况,分别利用1 Me V高能电子和45 ke V低能电子模拟地球同步轨道带电粒子辐射环境,研究热缩套管在这2种不同能量电子辐照下断裂伸长率和抗拉强度性能退化情况。试验结果表明,辐照后热缩套管颜色由透明变为黄色,力学性能均出现显著退化现象,且高能电子辐照后退化较低能电子辐照后更为严重。文章通过能量沉积分析、辐解气体分析、表面形貌分析和X射线光电子能谱分析等多种手段,对试验结果做出了合理解释。本研究对开展结构材料力学性能退化地面模拟试验中的能量粒子选择有指导意义。

Tests of electron irradiation effects on the mechanical properties of heat-shrinkable sleeves used in satellites

To study the mechanical property degradation of the heat-shrinkable sleeve in satellites under charged particles environment in GEO space, tests are carried out with respect to the degradation of the elongation rate at break and the tensile strength of the heat-shrinkable sleeve by high energy electron of 1 MeV and low energy electron of 45 keV. It is shown that there is a significant degradation of the mechanical properties under the irradiations, especially, of the high energy electron. The energy deposition, the radiation-induced gases, the surface morphology, and the XPS diagram are analyzed. The research provides some guidance for choosing appropriate energy particles to effectively simulate the degradation of mechanical properties of bulk materials.