南京航空航天大学学报（英文版）2024，Vol.41Issue(5)：589-598,10.DOI:10.16356/j.1005-1120.2024.05.004
基于多相机3D-DIC系统的变曲率圆柱壳全表面屈曲研究
Experimental Study on Full-Surface Buckling of Variable Curvature Cylindrical Shell Using Multi-camera 3D-DIC System
摘要
Abstract
To achieve full-surface strain measurement of variable curvature objects,a 360° 3D digital image correlation(DIC)system is proposed.The measurement system consists of four double-camera systems,which capture the object's entire surface from multiple angles,enabling comprehensive full-surface measurement.To increase the stitching quality,a hierarchical coordinate matching method is proposed.Initially,a 3D rigid body calibration auxiliary block is employed to track motion trajectory,which enables preliminary matching of four 3D-DIC sub-systems.Subsequently,secondary precise matching is performed based on feature points on the test specimen's surface.Through the hierarchical coordinate matching method,the local 3D coordinate systems of each double-camera system are unified into a global coordinate system,achieving 3D surface reconstruction of the variable curvature cylindrical shell,and error analysis is conducted on the results.Furthermore,axial compression buckling experiment is conducted to measure the displacement and strain fields on the cylindrical shell's surface.The experimental results are compared with the finite element analysis,validating the accuracy and effectiveness of the proposed multi-camera 3D-DIC measuring system.关键词
360°三维数字图像相关/逐级坐标匹配法/全场三维变形测量/变曲率圆柱壳Key words
360°3D digital image correlation(DIC)/hierarchical coordinate matching method/full-field 3D deformation measurement/variable curvature cylindrical shell分类
信息技术与安全科学引用本文复制引用
李欣,孙伟..基于多相机3D-DIC系统的变曲率圆柱壳全表面屈曲研究[J].南京航空航天大学学报（英文版）,2024,41(5):589-598,10.基金项目
This work was funded by the National Natural Science Foundations of China(Nos.12272176,U2037603). （Nos.12272176,U2037603）
