Fast Prediction Method of the Axial Contraction of Aviation Flared Tube

doi:10.3901/JME.2020.10.102

Abstract

Abstract: The axial contraction of the aviation flared tube is an important factor affecting the pipeline assembly. Currently the flared tube whose axial length is not qualified for the flared section is only adjusted on site by the workers' experience. Commonly used finite element methods require multiple simulations to obtain the axial contraction amount, and the computation efficiency is low. An one-step inverse analysis program of flared tube is developed. A radial projection method is proposed to obtain an initial guess, and the mesh smoothing algorithm is used to improve the precision of the initial guess. The size of the initial tube is obtained through the plastic iteration based on the full-scale theory, and the exact axial contraction is predicted within several seconds. The predicted axial contraction can provide basis for the determination of tube blank size in the design stage. Compared with the commercial finite element software LS-DYNA and Abaqus, the one-step inverse analysis program obviously simplifies the pre-processing operation and improves the calculation efficiency. Typical aviation flared tubes in different specifications are chosen for the stamping and flaring experiments. The error of results of one-step inverse analysis program is within 6.33% compared with experimental values. Generally speaking, the one-step inverse analysis program of flared tube has a fast calculation speed and high solution precision, can accurately predict the axial contraction of the flared tube and has a high practical application value.

Key words: flared tube, axial contraction, one-step inverse analysis, radial projection, mesh smoothing

CLC Number:

TG386

BAO Yidong, QIAN Wenqing, CHEN Xiaoyu, CUN Wenyuan, SHU Yang. Fast Prediction Method of the Axial Contraction of Aviation Flared Tube[J]. Journal of Mechanical Engineering, 2020, 56(10): 102-109.

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