Dynamic Compression Properties and Constitutive Model with Strain Rate Effect of Rubber Material
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摘要: 利用Instron万能试验机与LC4超硬铝合金分离式Hopkinson压杆设备，对3种不同波阻抗的橡胶材料炭黑母胶（Carbon Black Rubber）、硅橡胶（Silicone Rubber）和泡沫橡胶（Foam Rubber）在较大应变率范围（0.002~15 000s-1）内进行了单轴压缩实验，研究应变率对橡胶材料力学性能的影响。实验结果表明：3种橡胶的准静态与动态应力-应变曲线具有不同的应变硬化形式，且动态加载下随着应变率的增大，硬化效应逐渐增强；在准静态及高应变率（12 000~15 000 s-1）压缩下，泡沫橡胶表现出多孔类材料压缩曲线的弹性、塑性崩塌及致密化3段特征。基于Rivilin应变能模型，构建了一个应变率相关的动态本构模型，模拟结果与实验结果吻合较好，可以用于描述较大应变率范围内3种橡胶的非线性应力-应变关系。
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关键词:
- 橡胶 /
- 分离式Hopkinson压杆 /
- 应变率效应 /
- Rivlin模型
Abstract: This paper presents experimental study on the quasi-static and dynamic impact response for three kinds of rubbers: carbon black rubber, silicone rubber and foam rubber by using Instron machine and SHPB device. Experimental strain rate covers a wide range from 0.002 s-1 to 15 000 s-1. The strain rate effects on mechanical properties of rubber materials are discussed. The results show that the quasi-static and dynamic engineering strain-stress curves exhibite different strain hardening forms. Under dynamic loading, the significant rate sensitivities are observed i.e. with strain rate increasing the hardening effect is enhanced. With quasi-static and high strain rate (12 000－15 000 s-1) loading, the mechanical properties of foam rubbers show typical three stages: elastic deformation, plastic deformation and collapse portion. A constitutive model with strain rate effect is presented based on Rivilin strain energy function, which shows good agreement with experimental data.-
Key words:
- rubber /
- split Hopkinson pressure bar /
- strain rate effect /
- Rivlin model
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