Metadata (abstracts and keywords) for the articles in the journal
A. V. Kazantsev, I. E. Keller The limit forming estimation of multi-stage thin-walled vessel forming process // Vestnik I. Yakovlev Chuvach State Pedagogical University. Series: Mechanics of a limit state . 2020. № 4(46). p. 84-92
Author(s):
A. V. Kazantsev, I. E. Keller
Index of UDK:
539.374
DOI:
10.37972/chgpu.2020.46.4.004
Title:
The limit forming estimation of multi-stage thin-walled vessel forming process
A numerical model of multi-stage technological process of cold stamping of a thinwalled vessel made of sheet steel was built taking into account technological heredity. Relations of large plastic deformations of the anisotropic shell is used, taking into account the dynamics and contact interactions with the tool, which was implemented in the LS-DYNA package. Barlat’ plasticity model Yld 2000-2d with the power law of isotropic strain hardening is used with material constants identified from experimental data for low-carbon sheet steel DC04EK 0.7 mm. The forming limit curve was built on the distortion of the coordinate grid near the zones of strain localization and failure of the vessel in the technological process without intermediate annealing and in the failure test under uniaxial tension. The features of the strain paths in the control points of the vessel at each stage of the technological process, including the sequence of operations of drawing, distributing and reduction, are studied. The path calculation was confirmed by an experiment using pressing equipment as a test. The quality estimation of the product is evaluated by the distance of its deformed state from the limit states on the strain diagram. It is established that the operation of distributing the workpiece after its drawing quickly leads to the limit state and therefore requires a preliminary recovering the plasticity resource by annealing. There is a preference for forming the relief of the vessel by smaller degrees of distribution and greater degrees of reduction for elimination of the limit states and the operation of intermediate annealing.
The contact details of authors:
Keller, Ilya Ernstovich Head of laboratory, Laboratory of Nonlinear Mechanics of Deformable Solids, Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science, Perm, Russia.
Kazantsev, Alexander Vladimirovich Senior lecturer, Department of Dynamics and Strength of Machines, Perm National Research Polytechnic University, Perm, Russia.