An improved rheology model for the description of the rate-dependent cyclic behavior of high damping rubber bearings
An improved rheology model for the description of the rate-dependent cyclic behavior of high damping rubber bearings
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DOI：
10.1016/j.soildyn.2015.06.001
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发表时间：
2015-10
影响因子：
4
通讯作者：
D. A. Nguyen;J. Dang;Y. Okui;A. Amin;S. Okada;T. Imai
中科院分区：
文献类型：
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作者：
D. A. Nguyen;J. Dang;Y. Okui;A. Amin;S. Okada;T. Imai
从显式实验中得到的启发，提出了一种改进的流变模型，用于描述高阻尼橡胶支座在零度以下和室温下的速率相关循环剪切行为。将总应力分解为与率无关的非线性弹塑性应力、非线性弹性应力和非线性粘弹塑性过应力三个分支。为了反映非线性粘性行为，将线弹性弹簧与非线性弹塑性模型并联，串联非线性阻尼器，从而推广了“过应力分支”。根据恒应变率实验中观察到的基本现象，建立了模型单元的本构关系。一个最佳的计算方法，以确定一套独特的过应力参数，不仅能够代表恒定的应变率循环试验，但也正弦试验与可变输入应变率。通过将数值模拟结果与在−30 °C、−10 °C和23 °C下进行的实验进行比较，证实了所提出的模型的基本能力和估计参数的适当性。
An improved rheology model, inspired from explicit experiments is conceived to represent rate-dependent cyclic shear behavior of high damping rubber bearings at subzero and room temperatures. Total stress has been decomposed into nonlinear rate independent elasto-plastic stress, nonlinear elastic stress and nonlinear visco-elasto-plastic overstress branches. To represent nonlinear viscosity behavior, ‘overstress branch’ has been generalized by putting linear elastic spring in parallel to nonlinear elasto-plastic model, placed in series with nonlinear dashpot. Constitutive relations for model elements have been designated for respective fundamental phenomenon observed in constant strain rate experiments. An optimum calculation approach is developed to determine a unique set of overstress parameters capable not only of representing constant strain rate cyclic tests but also sinusoidal tests with variable input strain rates. Essential abilities of the proposed model and adequacy of estimated parameters have been confirmed by comparing numerical simulation results with experiments conducted at −30 °C, −10 °C and 23 °C.