| 谢中秋*,张蓬蓬.PMMA材料的动态压缩力学特性及应变率相关本构模型研究[J].实验力学,2013,28(2):220~226 |
| PMMA材料的动态压缩力学特性及应变率相关本构模型研究 |
| On the Dynamic Compressive Mechanical Properties and Strain Rate Related Constitutive Model of PMMA Material |
| 投稿时间：2012-04-12 修订日期：2012-12-04 |
| DOI：10.7520/1001-4888-12-054 |
| 中文关键词: 聚甲基丙烯酸甲酯 (有机玻璃) 分离式Hopkinson压杆实验 失效模式 ZWT粘弹性本构关系 |
| 英文关键词:Polymethylmethacrylate(PMMA) Split Hopkinson Pressure Bar (SHPB) experiment Failure mode ZWT visco-elastic constitutive relation |
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| 中文摘要: |
| 利用INSTRON万能试验机和分离式Hopkinson压杆(SHPB)对PMMA试件在较宽应变率范围内进行了单轴压缩实验,研究加载应变率对PMMA材料力学性能的影响。利用扫描电子显微镜对回收的试样进行了显微观察,重点分析不同加载应变率下PMMA的微观损伤破坏模式。结果表明:随着应变率的增大,PMMA的流动应力显著地增加,且冲击加载条件下,峰值应力的应变率敏感性明显高于准静态;在准静态加载条件下,PMMA试样呈现明显的延性破坏特征,在动态加载条件下则表现为脆性破坏。最后,对PMMA材料的ZWT粘弹性本构模型参数进行了拟合,拟合结果与实验结果吻合较好,表明该本构模型能够较好地描述较宽应变率范围内PMMA材料的应力应变关系。 |
| 英文摘要: |
| In order to investigate the effect of loading strain rate on the mechanical properties of PMMA, uniaxial compression test of PMMA in a large strain rate range was performed by using INSTRON universal testing machine and split Hopkinson pressure bar system (SHPB). Microstructure of deformed samples was microscopically observed based on SEM technique, microscopic damage and failure mode of PMMA at different loading strain rates are the focus of analysis. Results show that the flow stress of PMMA increases obviously with the increase of loading rate; under high strain rate loading condition, the strain rate sensitivity of peak stress is obviously higher than that in quasi-static region; under quasi-static loading condition, PMMA sample shows obvious ductile failure characteristics, while under dynamic loading condition, it presents brittle failure characteristics. Finally, PMMA ZWT visco-elastic constitutive model parameters were fitted, which show good coincide with experimental data. So it indicates that this constitutive model can better describe stress-strain relation of PMMA in a wider range of strain rate. |
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