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| The effect of aging on the material constant of the rubber isolator’s constitutive model Moony-Rivlin |
| LI Yanmin1,MA Yuhong1,LUO Jiarun2, ZHAO Guifeng3 |
1.Engineering seismic research centre of Guangzhou University, Guangdong, Guangzhou 510405;
2. Shanghai Construction Engineering Technology Co., Ltd., Shanghai 200062;
3. School of Civil Engineering of Guangzhou University, Guangzhou 510006, China |
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Abstract At present the Moony-Rivlin model is widely applied in finite element analysis of rubber isolators, a key point is to determined the material parameters of the model. In order to research the effect of aging on material constant of rubber intensively, through studing aging test result of rubber by the Least-square method, the material constants of Moony-Rivlin model were obtained, the relationship between the material constant and the aging time was derived, and a modified model of is given. Then, the fitting values were compared with the calculating values. Finally, the performance of the rubber isolators was simulated and studied by using the Abaqus software and the material constant determined from the above method, and, the results of finite element analysis were compared with the test results. The results show that: Moony-Rivlin model constant increases gradually with the increase of the aging time; the errors between the test values and the finite element simulation values for the vertical stiffness and the horizontal stiffness are acceptable, whether before aging or aged, so the accuracy of the modified constitutive model is verified, which can provide theoretical support for the performance study of rubber isolated bearings under the aging environment and the life-cycle performance design about bridges and other structures.
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Received: 07 December 2015
Published: 15 August 2016
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