Experimental study on the property deterioration of rubber material used as natural rubber bearing under seawater wet-dry cycles

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 146-152.

LI Yanmin1，MA Yuhong1，ZHAO Guifeng2，ZHOU Fulin2

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Abstract

Considering that offshore bridges are highly vulnerable to seawater wet-dry cycles caused by the weather of sunny or rainy, high humidity, high temperature, sea breeze et al., seawater wet-dry cycles tests were carried out on a natural rubber bearing and its rubber material for 60 days to investigate the mechanical properties deterioration of rubber material with the test time.The results show: the seawater wet-dry cycles have a greater influence on the mechanical property of rubber material.After testing for 60 days, the hardness of rubber material increases by about 22%, the strain stress under given elongation increases from 58.2%—118% and the rate of increase is even greater in large deformation.The tensile strength and elongation at break reduce by 65.7% and 51.53% respectively, which may affect the tensile property and ultimate shear property of the rubber bearing.The study can lay a solid foundation for the research on the variation of the constitutive relationship for rubber material, the performance deterioration of rubber bearings, the evaluation of life cycle performance and the design of isolation projects.

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Seawater Wet-Dry Cycles / Rubber Bearing / Rubber Material / Mechanical Property

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LI Yanmin1，MA Yuhong1，ZHAO Guifeng2，ZHOU Fulin2. Experimental study on the property deterioration of rubber material used as natural rubber bearing under seawater wet-dry cycles[J]. Journal of Vibration and Shock, 2019, 38(14): 146-152

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