Prediction of Critical Wrinkle Instability of Thin Plates by Combining Energy Method Theory with Numerical Simulation

doi:10.3901/JME.2020.04.057

Abstract

Abstract: In the research field of plastic sheet forming wrinkle instability prediction, finite element simulation has become an indispensable research method due to the limitations of theoretical and experimental research methods. Since the finite element method does not contain the wrinkle instability criterion, although the post-buckling morphology can be output by introducing the initial defect, the exact critical wrinkling moment cannot be defined, and the simulation results will fluctuate under the influence of Setting of meshing parameter. Aiming at this problem, the Yoshida buckling test is used as the verification experiment, the use of energy method theory and numerical simulation to establish the critical wrinkle determination line of 304 stainless steel square plate is proposed. The morphology and characteristics of the wrinkle instability determination line under the condition of uneven tensile load are discussed. The influence of geometric conditions and boundary conditions on the determination line of wrinkle instability of the test piece is discussed. The test strain cloud image taken by the full field strain measurement system VIC-3D confirmed the validity of the wrinkle determination line established. The research content provides research methods and some data support for the establishment of the limit diagram of sheet wrinkling instability.

Key words: wrinkle instability, energy method, Yoshida buckling test, wrinkle determination line

CLC Number:

TG386

DU Bing, SONG Pengfei, XIE Jun, ZHAO Changcai, GUAN Fenglong. Prediction of Critical Wrinkle Instability of Thin Plates by Combining Energy Method Theory with Numerical Simulation[J]. Journal of Mechanical Engineering, 2020, 56(4): 57-64.

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