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利用45 ke V,1 Me V和2 Me V电子分别对聚乙烯热缩套管进行辐照实验,研究不同能量电子辐照对聚乙烯热缩套管力学性能的影响,并分析电子辐照下材料的损伤效应机理,建立力学性能退化规律。结果表明:实验选定的3种能量电子辐照都会造成聚乙烯的降解,材料脆化产生裂纹,从而导致其力学性能下降;但是由于这3种能量电子穿透深度不同,45 ke V电子只能造成聚乙烯热缩套管表层材料损伤,力学性能最大下降量只有30%~40%,而1 Me V和2 Me V电子却会导致套管力学性能完全丧失,力学性能下降接近100%。
The effects of different energy electron irradiation on the mechanical properties of polyethylene shrink tube were studied by using 45 KeV, 1 MeV and 2 MeV electrons respectively. The effects of electron irradiation Material damage mechanism, the establishment of mechanical properties of the law of degradation. The results show that all the three kinds of energy electron irradiation selected by the experiment will result in the degradation of polyethylene and the material embrittlement, which will lead to the decrease of mechanical properties. However, due to the different penetrating depths of the three energy electrons, Can cause the damage of polyethylene heat shrinkable casing surface material, the maximum decrease of mechanical properties is only 30% ~ 40%, while 1 Me V and 2 Me V electrons will lead to complete loss of mechanical properties of bushing, mechanical properties decreased by nearly 100%.