Gamma radiation induced compressive response of silicon rubber foam: Experiments and modeling
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Gamma radiation induced compressive response of silicon rubber foam: Experiments and modeling Huyi Wang1
, Yong Qiu1, Wenjun Hu1,a), Yongmei Chen1
1
CAEP, Institute of Systems Engineering, Mianyang 621999, China; and Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang, Sichuan 621999, China a) Address all correspondence to this author. e-mail: [email protected] Received: 2 September 2018; accepted: 28 November 2018
Utilizing the experimental and modeling approaches, the Gamma radiation effects on stress responses of the silicon rubber foam under quasistatic compression are investigated. In the experimental work, the samples of the silicon rubber and the silicon rubber foams are quasistatically compressed before and after the Gamma radiation (a dose of 500 kGy and a dose rate of 100 Gy/min). The data reveal that the Gamma radiation obviously increases the material hardness, e.g., the compressive stresses of the silicon rubber and the silicon rubber foams both increase over 5 times as the strain is 20%. In the simulation work, a multiscale method combined with finite element method is developed to numerically predict the compressive stress of the silicon rubber foams. The microscale models are first constructed based on the real microstructures of the silicon rubber foams. The compressive stress and strain relation before and after the Gamma radiation is then simulated and obtained utilizing the phenomenological constitutive models based on the testing data of the silicon rubber. The simulation reveals that the Gamma radiation strongly affects the compressive response of the microscale models. The stress responses of the microscale models are then transferred into the macroscale models. The results also prove that the Gamma radiation obviously increases the hardness of the macroscale models. Data comparison shows that the numerical results agree with the testing data well, which verifies the developed method. The present work develops a new method to predict the radiation effects on mechanical properties of rubber foams.
Introduction Due to their superior mechanical and biological properties, rubber foam materials exhibit high elasticity, shock resistance, wear resistance, insulating properties, and physiological inertness [1, 2, 3]. Nowadays, rubber foam materials have been widely used in modern engineering, such as transportation, aerospace, and construction industries. For the purpose of modification, rubber foam materials are usually exposed to high-energy radiation such as Gamma radiation [4]. Ashok et al. (2017) noted that the influence of the Gamma radiation affects polymers in two ways. One is chain scission which results in reduced tensile strength and elongation at break. The other is crosslinking which increases tensile strength but reduces the elongation at break [5]. Many researchers conclude that the Gamma radiation could strongly affect the mechanical properties of rubber materials, which accordingly affects the
ª Materials Research Society 2019
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