高弹态未硫化橡胶在不同变形模式下的循环加卸载力学行为  

The cyclic loading-unloading mechanical behavior of uncured rubber in different deformation modes

作　　者：袁梦[1] 李钊 张光坤 李旭[1] YUAN Meng;LI Zhao;ZHANG Guangkun;LI Xu(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Department of Engineering Structure and Mechanics,Wuhan University of Technology,Wuhan 430070,Hubei,China;Wuhan Second Ship Design and Research Institute,Wuhan 430064,Hubei,China)

机构地区：[1]武汉理工大学工程结构与力学系新材料力学理论与应用湖北省重点实验室,北武汉430070 [2]武汉第二船舶设计研究所,湖北武汉430064

出　　处：《实验力学》2023年第2期196-208,共13页Journal of Experimental Mechanics

基　　金：国家自然科学基金(11902229)资助;中央高校基本科研业务费专项资金(WUT:2020IB007)资助。

摘　　要：对高弹态未硫化橡胶实施了不同变形模式(单轴拉伸和压缩)的循环力学实验,以考察其黏超弹性响应以及应变率对力学行为的影响。结果表明,材料的拉伸、压缩性能与加载速率和变形历史均有着显著的相关性。对于循环拉伸变形,应力-应变曲线的非线性特征较为明显,材料表现出类似于屈服的性质,且随着循环次数和变形量增加,迟滞损耗的积累趋势逐渐减弱;而对于循环压缩变形,应力-应变关系接近线弹性,且随着循环次数和变形量增加,材料刚度和迟滞损耗积累的趋势都逐渐增强。针对上述实验结果,在经典的Bergstrom-Boyce模型中引入损伤变量,对未硫化橡胶的应变率相关性和Mullins效应进行表征。理论计算结果表明,这种非线性黏超弹模型能够较好地描述未硫化橡胶在不同载荷条件下的变形响应与应力软化特征。In order to investigate the visco-hyperelastic response of uncured rubber and its strain rate dependent performance,a series of cyclic mechanical tests in two different deformation modes(namely uniaxial tension and compression)were carried out.Our test results indicate that the tensile and compression properties of this material are significantly dependent on its loading speed and history.Under the case of cyclic tension,the stress-strain relation of this material shows a strong nonlinearity and yield-like characteristic,and the increasing trend of hysteresis gradually stabilizes with cycle number and preceding strain level.By contrast,under the case of cyclic compression,the stress-strain relation is almost linear elastic during each cycle.Both the material modulus and hysteresis loss gradually aggravate with cycle number and preceding strain level.According to the experimental observations,we take into account the Mullins effect based on the classical rate-dependent Bergstrom-Boyce model.By comparing the test data and characterization result,it is found that this constitutive model can describe the hyper-elasticity,viscous flow,and softening of uncured rubber in different modes.

关 键 词：未硫化橡胶 应变率 循环加卸载 迟滞损耗 本构模型 

分 类 号：O348[理学—固体力学]