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1 December 2010 Deformation measurement method for spatial complex tubular joints based on photogrammetry
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The destruction of spatial complex tubular joints may lead to failure of the whole tubular structure, thus it is necessary to analyze the mechanical properties of spatial complex tubular joint. In this paper, a novel method based on close range photogrammetry to accurately measure the three-dimensional (3D) deformation of spatial complex tubular joints during loading test is proposed. Artificial targets are pasted on the deformation area before loading. The 3D coordinates of these targets are reconstructed by analyzing the images captured at each stage, and the coordinate systems of different stages are registered together by means of global transformation points. The whole field 3D deformation under different load levels is then obtained by tracking the homonymous targets among different stages. It is helpful for further analysis of the mechanical properties. Two different precision evaluation experiments indicate that the proposed method could achieve accuracy of 0.1mm/m. Two full scale tubular joints are tested and a feasible solution for improving the load carrying capacity of the tested tubular joints is thus obtained as per the measured results. For comparison, finite element analysis is employed to predict the deformation in a traditional way. The deformation tendency measured by two methods agrees well.
©(2010) Society of Photo-Optical Instrumentation Engineers (SPIE)
Bao-Quan Shi, Jin Liang, Zhen-Zhong Xiao, Xiao-Qiang Zhang, and Qing Liu "Deformation measurement method for spatial complex tubular joints based on photogrammetry," Optical Engineering 49(12), 123604 (1 December 2010).
Published: 1 December 2010

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