作者：郭玲梅1, 汪洋2, 徐伟芳1
作者单位：1. 中国工程物理研究院总体工程研究所, 四川 绵阳 621999;
2. 中国科学技术大学工程科学学院, 安徽 合肥 230027
关键词：硅橡胶;霍普金森杆测试技术;拉伸行为;低强度低波阻抗;应变率相关性
摘要：
硅橡胶是一种应用广泛的高分子材料，其在服役过程中常承受冲击载荷，研究应变率对硅橡胶拉伸力学行为的影响在工程实际中具有重要价值。该文利用自动网格法应变测量技术和Instron-E3000材料试验机对硅橡胶进行应变率为0.001 s-1的单向拉伸测试；在液压伺服中应变率材料试验机上对硅橡胶进行应变率为15 s-1的单向拉伸测试；基于分离式霍普金森拉杆（SHTB）实验装置发展一种可适用于低模量、低波阻抗材料的动态拉伸测试技术，实现对硅橡胶应变率为350 s-1和1 400 s-1的单向拉伸测试。硅橡胶不同应变率下的单向拉伸测试结果表明：硅橡胶的拉伸力学行为具有明显的非线性弹性和应变率敏感性特征，随着应变率的升高，材料的模量和定伸长应力均呈现出增大的趋势，呈现出应变率正相关特征。
The study on strain-rate dependence of tension behavior of filled silicone rubber
GUO Lingmei1, WANG Yang2, XU Weifang1
1. Institute of Structural Engineering, China Academy of Engineering Physics, Mianyang 621999, China;
2. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230027, China
Abstract: Silicone rubber has been widely used in many engineering applications, which have the potential to be exposed to dynamic loading, it is necessary to study the tensile behavior of silicone rubber subjected to dynamic loading. Based on the automatic grid method,the quasi-static uniaxial tension tests at the strain rate of 0.001 s-1 were performed. The tensile tests at a moderate strain-rate of 15 s-1 were performed on a material testing machine. A grip method was proposed to reliably connect the tensile specimen with the wave-guiding bars, the strain calibration was found, the geometry was carefully designed. The high strain-rate tension test of 350 s-1 and 1 400 s-1 were carried out using a split Hopkinson tension bar (SHTB). Experimental results show that the tensile behavior of the filled silicone rubber exhibits apparent nonlinear elastic characteristics. Furthermore, the values of tensile modulus and nominal stress at a given elongation increase with the strain-rate increasing.
Keywords: silicone rubber;Hopkinson bar technique;tension behavior;low strength and low impedance;strain-rate dependence
2018, 1900-02-12(10): 85-88 收稿日期: 2018-05-07;收到修改稿日期: 2018-06-12
基金项目: 国家自然科学基金NSAF基金（U1230103）
作者简介: 郭玲梅(1991-),女,四川仪陇县人,助理研究员,博士,研究方向为冲击动力学
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