| In order to investigate the mechanical properties of fundamental research objects such as beams, plates, and columns in the field of mechanical research, optical measurement methods are often necessary to accurately assess their deformations. These structures typically possess characteristics such as high aspect ratios, large sizes, and significant surface curvatures. Conventional three-dimensional digital image correlation (3D-DIC) methods may not satisfy the demand for high precision and comprehensive measurements, thereby necessitating the utilization of a multi-camera DIC approach. Different camera arrangement modes are required for multi-camera DIC depending on the specific measurement requirements. In this paper, we propose linear, matrix, and circumferential multi-camera arrangements tailored for beams, plates, and columns, respectively. Subsequently, we experimentally validate the feasibility and effectiveness of these arrangements by conducting measurements. By employing the multi-camera DIC method, highly accurate deformation results of the entire field through a four-point bending test of an I-beam, a thermal warping deformation measurement test of a plate, and a compression test of a thin-walled cylinder are achieved. These results conclusively demonstrate that multi-camera DIC, via various camera arrangements, can effectively fulfill comprehensive measurement requirements in mechanical research. |
