Constitutive Modeling for Strain-Rate Dependency of Natural and High Damping Rubbers

天然橡胶和高阻尼橡胶应变率依赖性的本构模型

• 批准号: 12650457
• 负责人: OKUI Yoshiaki
• 金额: $ 2.62万
• 依托单位: Saitama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650457/
• 关键词: High damping rubber; Natural rubber; Hyper elasticity; Constitutive model; Rate dependency; Viscoelasticity; Finite strain deformation; Microstructure of rubber; Mullins効果

The microstructure and the mechanical behavior of natural rubber (NR) and high damping rubber (HDR) were investigated. In this study, most of the attention was paid to the compression regime. The mechanical tests revealed the existence of Mullins' effect, strainrate dependency, hystersis and residual strain effects in all the specimens. In NR, the extent of these effects were found to have a inherent relation with the presence of microstructural voids. The presence of all these effects was also found to be significant in HDR. In addition, the strain-rate dependent high initial stiffness feature at low compressive stretch levels also became evident from the experiments. However, the microstructural observation of the current study could not explain these features of HDR. This prompted for the need of considering a phenomenological approach to reach a general constitutive model.A constitutive model based on phenomenological motivation was introduced to model the strain-rate dependency. A … More n improved hyperelasticity model was proposed to represent the rate-independent elastic responses including high initial stiffness characteristics. A comparative evaluation was carried out to display the better performance of the proposed hyperelasticity model over the conventional ones. The hyperelasticity relation was incorporated in a finite deformation rate-dependent model structure. A parameter identification scheme was proposed to identify the parameters for the equilibrium and the instantaneous responses from the experimental data. The difficulties of direct application of infinitely fast or slow loading rate on such highly viscous material to obtain these responses and thereby to identify the nonlinear elastic parameters were overcome. Experimental results were extrapolated and the proposed hyperelasticity model was used. The proposed scheme was applied on three types of specimens. Numerical simulation of the test results at different deformation modes followed by sensitivity studies verified the adequacy and the robustness of the proposed model and the parameter identification scheme. Less

研究了天然橡胶（NR）和高阻尼橡胶（HDR）的微观结构和力学性能。在这项研究中，大部分注意力都集中在压缩状态。力学试验表明，所有试件均存在Mullins效应、应变率依赖性、滞后效应和残余应变效应。在NR中，发现这些影响的程度与微观结构空隙的存在有内在的关系。所有这些影响的存在也被发现是显着的HDR。此外，在低压缩拉伸水平下的应变率相关的高初始刚度特征也从实验中变得明显。然而，目前研究的显微结构观察不能解释HDR的这些特征。基于唯象理论，提出了一种基于唯象理论的本构模型来描述应变率相关性。一 ...更多信息 提出了一种改进的超弹性模型来描述包含高初始刚度特性的率无关弹性响应。进行了比较评估，以显示更好的性能，建议的超弹性模型比传统的。超弹性关系被纳入一个有限变形率相关的模型结构。提出了一种参数辨识方法，从实验数据中辨识出系统的平衡参数和瞬态响应参数。克服了在这种高粘性材料上直接施加无限快或无限慢的加载速率以获得这些响应从而识别非线性弹性参数的困难。实验结果外推和建议的超弹性模型。所提出的计划被应用在三种类型的标本。对不同变形模式下的试验结果进行了数值模拟，并进行了敏感性研究，验证了所提出的模型和参数识别方案的充分性和鲁棒性。少

项目成果

Amin, A. F. M. S., Alam, M. Shah, Okui, Y.: "Hyperelasticity Modeling of High Damping Rubber and Finite Element Simulation"Proceedings of 55^<th> Annual Conference of Japan Society of Civil Engineers, Sendai, Japan, September 2000.. I-A8. (2000)

Amin, A. F. M. S.、Alam, M. Shah、Okui, Y.：“高阻尼橡胶的超弹性建模和有限元模拟”第 55 届日本土木工程师学会年会论文集，日本仙台，2000 年 9 月。

Alam, M. Shah, Takanezawa, S., Amin, A. F. M. S., Okui, Y.: "Mechanical Behavior of Elastomers Under Compression and Its Microstructure"Proceedings of 55^<th> Annual Conference of Japan Society of Civil Engineers, Sendai, Japan, September.. I-A9. (2000)

Alam, M. Shah, Takanezawa, S., Amin, A. F. M. S., Okui, Y.：“压缩下弹性体的机械行为及其微观结构”第 55 届日本土木工程师学会年会论文集，日本仙台

Amin,Alam,Okui: "Development of rate-dependent coustitutive model for elastomers"Proc.1st Int.Structural Engineering and Construction Conf.. 623-628 (2001)

Amin，Alam，Okui：“弹性体的速率相关成本模型的开发”Proc.1st Int.Structural Engineering and Construction Conf.. 623-628 (2001)

A.F.M.S. Amin, M.S. Alam, Y. Okui: "An improved hyperelasticity relation in modeling viscoelasticity response of natural and high damping rubbers in compression : experiments, parameter identification and numerical venfication"Mechanics of Materials. 34.

原子力显微镜

A.Amin, M.Alam, Y.Okui: "An improved hyperelasticity relation in modeling viscoelasticity response of natural and high damping rubbers in compression: experiments,parameter identification and numerical verification"Mechanics of materials. 34. 75-95 (2002)

A.Amin、M.Alam、Y.Okui：“模拟天然和高阻尼橡胶压缩粘弹性响应的改进超弹性关系：实验、参数识别和数值验证”材料力学。