Influence of 60Co Gamma Irradiation on Compression Properties of the Silicone Rubber Foams
SHI Ping'an1,2, QIU Yong1,2, WAN Qiang1,2, HU Wenjun1,2, YAN Shunping1,2
1 Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621999, China; 2 Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621999, China
Abstract: In order to prove theoretical basis and selecting optimizing design of silicone foamcushion under 60Co γ-irradiation conditions, the influence of radiation on the compression properties of silicone rubber foams was studied by several methods, such as the mechanics experiment, irradiation experiment, and scanning electron microscopy (SEM) analysis, and the damage mechanism were inferred through analysis the irreversible transformation of the indented materials before and after γ-irradiation. Furthermore, a model for the compressive strength prediction of silicone foam cushion was proposed in accordance with irradiation effects, and the variation of compressive modulus and fracture strain with irradiation doses were obtained. The results showed that irradiation dose and pre-strain had significant effects on the properties of silicone rubber foam, and the mechanics property of irradiated silicone rubber foams increased at beginning and then decreased with enhanced γ-radiation dose under low pre-strain condition. But the pre-strain exceeded 50%, the mechanics property of irradiated silicone rubber foams firstly decreased rapidly and then slowly with enhanced γ-radiation dose. Tensile strength and shear strength of irradiated silicone rubber foams were enhanced by 69% and 84%, respectively, at a pre-strain of 30% and a radiation dose of 300 kGy. When the radiation dose increased to 1 000 kGy, the value dropped to 47% and 50% of the initial value. Those significant changes provided information for inferring the mechanism of radiation induced cross-linking and degradation reactions of mechanics property of silicone rubber foams. The analysis result of macroscopic properties and microstructure could prove it.
史平安, 邱勇, 万强, 胡文军, 晏顺坪. 60Co γ射线辐照对硅泡沫材料压缩性能的影响[J]. 材料导报, 2021, 35(2): 2151-2156.
SHI Ping'an, QIU Yong, WAN Qiang, HU Wenjun, YAN Shunping. Influence of 60Co Gamma Irradiation on Compression Properties of the Silicone Rubber Foams. Materials Reports, 2021, 35(2): 2151-2156.
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2021, Vol. 35 
