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非连续数字图像相关方法在裂纹重构中的应用

汤文治, 肖汉斌, 邹晟

汤文治, 肖汉斌, 邹晟. 非连续数字图像相关方法在裂纹重构中的应用[J]. 力学学报, 2019, 51(4): 1101-1109. DOI: 10.6052/0459-1879-19-098
引用本文: 汤文治, 肖汉斌, 邹晟. 非连续数字图像相关方法在裂纹重构中的应用[J]. 力学学报, 2019, 51(4): 1101-1109. DOI: 10.6052/0459-1879-19-098
Tang Wenzhi, Xiao Hanbin, Zou Sheng. APPLICATION OF DISCONTINUOUS DIGITAL IMAGE CORRELATION IN CRACK RECONSTRUCTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(4): 1101-1109. DOI: 10.6052/0459-1879-19-098
Citation: Tang Wenzhi, Xiao Hanbin, Zou Sheng. APPLICATION OF DISCONTINUOUS DIGITAL IMAGE CORRELATION IN CRACK RECONSTRUCTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(4): 1101-1109. DOI: 10.6052/0459-1879-19-098
汤文治, 肖汉斌, 邹晟. 非连续数字图像相关方法在裂纹重构中的应用[J]. 力学学报, 2019, 51(4): 1101-1109. CSTR: 32045.14.0459-1879-19-098
引用本文: 汤文治, 肖汉斌, 邹晟. 非连续数字图像相关方法在裂纹重构中的应用[J]. 力学学报, 2019, 51(4): 1101-1109. CSTR: 32045.14.0459-1879-19-098
Tang Wenzhi, Xiao Hanbin, Zou Sheng. APPLICATION OF DISCONTINUOUS DIGITAL IMAGE CORRELATION IN CRACK RECONSTRUCTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(4): 1101-1109. CSTR: 32045.14.0459-1879-19-098
Citation: Tang Wenzhi, Xiao Hanbin, Zou Sheng. APPLICATION OF DISCONTINUOUS DIGITAL IMAGE CORRELATION IN CRACK RECONSTRUCTION[J]. Chinese Journal of Theoretical and Applied Mechanics, 2019, 51(4): 1101-1109. CSTR: 32045.14.0459-1879-19-098

非连续数字图像相关方法在裂纹重构中的应用

基金项目: 1) 中央高校基本科研业务费专项资金(2015-JL-015);国家科技支撑计划(2015BAF06B016)
详细信息
    通讯作者:

    汤文治

  • 中图分类号: TB302.3,TP391.4

APPLICATION OF DISCONTINUOUS DIGITAL IMAGE CORRELATION IN CRACK RECONSTRUCTION

  • 摘要: 数字图像相关方法作为一种新的非接触式位移测量方法,在力学工程中有广泛的应用前景,然而受限于标准方法对图像变形的连续性要求,这种高效的测量方法在断裂力学领域的推广受到了限制. 为解决这一问题,提出采用引入子区分离数学模型,代替标准方法的连续模型,来对非连续区域进行精确识别和匹配的非连续数字图像相关方法. 研究子区被裂纹等非连续分割后原始像素点的位移情况,并引入裂纹张开向量用以表征被分割子区的主区和副区的位移关系;从而建立子区分离模型的数学表达式,并且为所提出的模型设计相应的图像相关算法;然后将所提出的非连续数字图像相关方法应用于重构平板拉伸试验开裂过程中图像的位移. 研究结果表明,相比于标准的数字图像相关方法,所提出的非连续数字图像相关方法解决了图像相关法在非连续区域失效的问题,提高了数字图像相关方法对位移测量的正确率,特别是能够准确重构裂纹面及附近的位移场,其测量精度能够达到亚像素级别.
    Abstract: The digital image correlation (DIC) method is a new non-destructive, contactless displacement measurement approach and it can be broadly applied in mechanical engineering with wide application prospect. However, this efficient and convenient displacement measurement method is difficult to apply in fracture mechanics due to the limitation that continuous deformation is required when processing the deformed images with standard digital image correlation methods. Aiming at solving this problem, this paper proposes a novel discontinuous digital image correlation (DDIC) method by introducing the splitted subset model to take the place of continuous model and use it to analyze the discontinuous areas where standard digital image correlation method is not valid in. The displacement of the original pixel points is studied when discontinuities such as cracks occurs, and the crack opening vector is introduced to represent the displacement relationship between the master zone and the slave zone after subset splitting into two parts. Thus the mathematical model of the splitted subset can be established by using the crack opening vector to correlate the master zone and the slave zone, and the corresponding image correlation algorithm can be designed based on this model. Afterwards, the proposed discontinuous digital image correlation method is used to measure the displacements of the deformed images obtained from the cracking process when a tensile test is applied to the notched plate. The research results show that the proposed DDIC method works well in both continuous and discontinuous areas, and when compared with the standard DIC method, the DDIC method is capable to solve the validation problem of image correlation method in discontinuous region, and improves the accuracy for displacement measurement, moreover, the proposed method is able to reconstruct the crack faces and the displacement fields in the vicinity region crack, and the accuracy of displacement measurement can be controlled within the range of subpixel level.
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  • 期刊类型引用(5)

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    2. 董伟,赵广臣,施天威,张海东,毛镪. 基于可靠子区数字图像相关方法的裂纹位移场测量. 实验力学. 2024(06): 775-784 . 百度学术
    3. 程斌,李得睿. 基于退相关DIC的疲劳裂纹全局动态测量方法. 力学学报. 2022(04): 1040-1050 . 本站查看
    4. 董伟,王学滨. 岩土工程相似模拟试验观测的可靠子区数字图像相关方法. 岩土力学. 2021(09): 2525-2534 . 百度学术
    5. 杜鉴昕,赵加清,王海涛,孙立斌,吴莘馨. 一种针对裂尖变形场测量的正则化全局DIC方法. 光学学报. 2020(11): 116-123 . 百度学术

    其他类型引用(7)

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出版历程
  • 收稿日期:  2019-04-16
  • 刊出日期:  2019-07-17

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