| 于宁宇,李群*.基于数字散斑相关实验测量的材料构型力的计算方法[J].实验力学,2014,29(5):579~588 |
| 基于数字散斑相关实验测量的材料构型力的计算方法 |
| On the Algorithm of Material Configurational Force Based on Digital Image Correlation Measurement |
| 投稿时间：2013-09-02 修订日期：2013-10-31 |
| DOI： |
| 中文关键词: 构型力 数字图像相关 (DIC) 复杂缺陷 |
| 英文关键词:configurational force digital image correlation (DIC) multi-defects |
| 基金项目:国家自然科学基金青年项目（11202156）；国家自然科学基金面上项目（11472205，11172228），国家自然科学基金创新团体（11321062） |
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| 中文摘要: |
| 材料构型力学主要研究材料中的缺陷(夹杂、空穴、位错、裂纹、塑性区等)的构型(形状、尺寸和位置)改变时，所引起的系统自由能的变化。本研究将基于数字散斑相关技术，实验测量材料试件的位移场分布，随后通过材料构型力的定义式，计算求得弹塑性材料中缺陷构型力的分布。其方法概括如下：位移场通过数字图像相关技术测得；应变及位移梯度场利用三次样条拟合获得；线弹性材料应力通过简单线弹性本构方程获取，而塑性材料的表面应力场通过Ramberg-Osgood本构方程计算求得；弹塑性应变能密度分布则由应力-应变曲线数值积分获得。该方法对普通弹性材料或者弹塑性材料均适用，可以用于各种不同的缺陷及缺陷群的材料构型力测量。 |
| 英文摘要: |
| The focus of material configurational mechanics is the free energy variation of a system due to the defects (such as inclusion, cavity, dislocation, crack and plastic zone etc.) configurational (such as shape, size and position etc.) evolution in material. In this study, nondestructive evaluation of material configurational force in elastoplastic materials was carried out. The displacement distribution of specimen was obtained through experimental measurement based on digital image correlation. According to the definition of material configurational force formula, the distribution of defect's configurational force in elastoplastic materials was calculated. The methods are summarized below: the displacement distribution of specimen is obtained through experimental measurement based on digital image correlation; the strain and displacement differential are calculated through the smoothed displacement by spline function technique; the surface stress distribution of elastoplastic materials is calculated based on Ramberg-Osgood theory; the total strain energy density is evaluated by integration of nonlinear strain-stress relation. The method proposed in this paper is applicable for both common elastic materials and elastoplastic materials, and can be used to evaluate the material configurational force for various defects and defect clusters. |
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