基于数字图像相关性方法的脆性材料拉氏反分析实验技术 |
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引用本文: | 丁圆圆,张振,赖华伟,王永刚.基于数字图像相关性方法的脆性材料拉氏反分析实验技术[J].爆炸与冲击,2018,38(6):1310-1316. |
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作者姓名: | 丁圆圆 张振 赖华伟 王永刚 |
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作者单位: | 宁波大学冲击与安全工程教育部重点实验室,浙江宁波,315211;宁波大学冲击与安全工程教育部重点实验室,浙江宁波,315211;宁波大学冲击与安全工程教育部重点实验室,浙江宁波,315211;宁波大学冲击与安全工程教育部重点实验室,浙江宁波,315211 |
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基金项目: | 国家自然科学基金项目11472142科学挑战专题项目TZ2018001 |
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摘 要: | 利用分离式Hopkinson压杆作为加载系统,借助超高速数字图像相关性分析方法,发展了长杆试件拉氏反分析实验技术,并用于研究脆性材料在小变形条件下的动态本构特性。通过超高速相机实时拍摄冲击加载下长杆试件变形的散斑图像,再对散斑图像进行数字图像相关性(digital image correlation,DIC)分析,获得长杆试件表面速度场和应变场。随后,以脆性材料PMMA(polymethyl methacrylate)为例,从DIC分析得到的速度场中提取出不同拉格朗日位置上质点速度时程曲线,构建路径线连接整个速度场,再结合零初始条件,数值求解得到了试件中的应力时程曲线,消去时间参数后,获得了脆性材料PMMA的动态应力-应变曲线,并与Hopkinson压杆实验和准静态压缩实验的结果进行了对比,揭示了PMMA材料在小应变条件下的黏弹性本构响应特征。
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关 键 词: | 拉氏反分析 数字图像相关性 超高速相机 脆性材料 动态本构 |
收稿时间: | 2018-02-05 |
A Lagrangian inverse analysis technique for studying dynamic mechanical properites of brittle materials based on digital image correlation |
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Institution: | Key Laboratory of Impact and Safety Engineering, Ministry of Education of China, Ningbo University, Ningbo 315211, Zhejiang, China |
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Abstract: | Based on the Hopkinson pressure bar and digital image correlation (DIC) techniques, a new Lagrangian inverse analysis experimental method was proposed to study the dynamic constitutive relation of brittle materials. A series of speckle images of long specimen deformation were recorded by an ultra-high-speed camera. The speckle images were processed by DIC to derive the velocity fields and strain fields on the surface of a long specimen. Based on the multi-particles velocity history curves measured by DIC, the whole velocity fields were constructed by many path lines. Then, a Lagrangian inverse analysis method was established for the dynamic constitutive relation of brittle rate-dependent PMMA materials by numerical solution. The results were compared with those of Hopkinson pressure bar test and quasi-static compression test, which display the characteristics of viscoelastic constitutive response of PMMA under the condition of small strain. |
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