Dynamic digital image correlation method for rolling convective contact

IF 3.4 3区 工程技术 Q1 MECHANICS
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引用次数: 0

Abstract

Digital image correlation (DIC) is an increasingly popular and effective non-contact method for measuring full-field displacements and strains of deformable bodies under load. Current DIC methods applied to bodies undergoing large displacements and rotations require a large measurement area for both the reference (i.e., undeformed) image and the deformed images. This can limit the resulting resolution of the displacement and strain fields. To address this issue, we propose a two-stage dynamic DIC method capable of measuring displacements and strains under material convection with high resolution. During the first stage, the reference image is assembled from smaller, high-resolution images of the undeformed object obtained using a spatially-fixed or moving frame. Following capture, each sub-image is rigidly translated and rotated into its appropriate place, thereby producing a full, high-resolution image of the reference body. In stage two, images of the loaded and deformed body, again obtained using a small camera frame with high resolution, are aligned with matching regions of the undeformed composite image using BRISK feature detection before performing DIC. We demonstrate the method on a contact problem whereby an elastomeric roller travels along a rigid surface. In doing so, we obtain fine-resolution measurements of the state of strain of the region of the roller sidewall in contact with the substrate, even as new material convects through the region of interest. We present these measurements as a series of images and videos capturing strain evolution as the roller transitions from static loads to a fully dynamic steady-state, documenting the effectiveness of the method.
滚动对流接触的动态数字图像相关方法
数字图像相关(DIC)是一种日益流行和有效的非接触式方法,用于测量负载下可变形体的全场位移和应变。目前应用于大位移和大旋转体的 DIC 方法需要对参考(即未变形)图像和变形图像进行大面积测量。这会限制位移和应变场的分辨率。为了解决这个问题,我们提出了一种两阶段动态 DIC 方法,能够以高分辨率测量材料对流下的位移和应变。在第一阶段,参考图像由未变形物体的较小、高分辨率图像组合而成,这些图像通过空间固定或移动框架获得。捕捉后,每个子图像都会被刚性平移和旋转到适当的位置,从而生成参考体的完整高分辨率图像。在第二阶段,再次使用高分辨率的小型相机帧获取加载和变形体的图像,在执行 DIC 之前,使用 BRISK 特征检测将其与未变形复合图像的匹配区域对齐。我们在弹性辊子沿刚性表面移动的接触问题上演示了该方法。在此过程中,我们获得了辊筒侧壁与基体接触区域应变状态的精细分辨率测量值,甚至在新材料通过相关区域对流时也是如此。我们将这些测量结果以一系列图像和视频的形式呈现,捕捉滚筒从静态负载过渡到完全动态稳态时的应变演变,记录下该方法的有效性。
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来源期刊
CiteScore
6.70
自引率
8.30%
发文量
405
审稿时长
70 days
期刊介绍: The International Journal of Solids and Structures has as its objective the publication and dissemination of original research in Mechanics of Solids and Structures as a field of Applied Science and Engineering. It fosters thus the exchange of ideas among workers in different parts of the world and also among workers who emphasize different aspects of the foundations and applications of the field. Standing as it does at the cross-roads of Materials Science, Life Sciences, Mathematics, Physics and Engineering Design, the Mechanics of Solids and Structures is experiencing considerable growth as a result of recent technological advances. The Journal, by providing an international medium of communication, is encouraging this growth and is encompassing all aspects of the field from the more classical problems of structural analysis to mechanics of solids continually interacting with other media and including fracture, flow, wave propagation, heat transfer, thermal effects in solids, optimum design methods, model analysis, structural topology and numerical techniques. Interest extends to both inorganic and organic solids and structures.
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