硅橡胶压缩力学性能及率相关本构模型  

Compressive Mechanical Properties and Constitutive Model of Rubber Material

作　　者：王逸凡 徐豫新[1] 张浩宇 焦晓龙 吴宗娅 WANG Yifan;XU Yuxin;ZHANG Haoyu;JIAO Xiaolong;WU Zongya(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Shanxi Jiangyang Chemical Co.,Ltd.,Taiyuan,Shanxi 030041,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]山西江阳化工有限公司,山西太原030041

出　　处：《北京理工大学学报》2024年第3期231-238,共8页Transactions of Beijing Institute of Technology

基　　金：国防科技创新特区项目(JW112021J035-2)。

摘　　要：研究了典型超弹性材料硅橡胶压缩力学性能及率相关本构模型.采用Instron万能材料试验机和分离式Hopkinson压杆(SHPB)试验装置对硅橡胶进行了准静态和动态压缩测试,基于测试结果分析了硅橡胶材料在0.001、0.01、0.1、1750、2300和3000 s^(−1)应变率下的力学行为.测试结果表明,硅橡胶在静态载荷下有显著的超弹性特性,动态载荷下表现出明显的应变率效应,弹性模量与应变率比值对数之间存在非线性关系;据此,建立了率相关本构方程来描述硅橡胶在静、动态压缩载荷下的力学行为,与现有模型相比,所建立的本构方程参数仅有5个,在试验应变范围内应力最大误差保持在15%以内,与试验结果有良好一致性.The compressive properties and constitutive model of silicon rubber were studied.Quasi-static and dynamic compression tests were carried out using an Instron-8872 universal machine and a modified Hopkinson pressure bar experiment device.The mechanical behaviors of silicon rubber materials at six different strain rates(0.001、0.01、0.1、1750、2300、3000 s^(−1))were analyzed.The results show that silicon rubber has significant hyperelastic properties under static load and exhibits remarkable strain rate effects under dynamic load.There is a nonlinear relationship between elastic modulus and logarithm of strain rate ratio.Based on this,a constitutive model with a strain rate term was established to describe the mechanical properties of silicon rubber under static and dynamic compressive loads.Compared with existing models,the established five-parameter constitutive equation has the advantage of simple form.The maximum error within the strain range is kept within 15%,which is in good agreement with the experiment results.

关 键 词：本构模型 硅橡胶 应变率相关 压缩力学性能 

分 类 号：O347.3[理学—固体力学]