Symmetry/Asymmetry in Metal Forming

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 5623

Special Issue Editors


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Guest Editor
1. Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University), Ministry of Education of China, Qinhuangdao 066004, China
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China
Interests: stamping process and intelligence; precision plastic forming; plastic forming theory
Key Laboratory of Advanced Forging & Stamping Technology and Science, Yanshan University, Qinhuangdao 066004, China
Interests: materials processing; metal forming; material modeling; mechanical properties; pipe; finite element method; numerical simulation; bending springback

Special Issue Information

Dear Colleagues,

Symmetry is a kind of beauty, and asymmetry is also a kind of beauty. Symmetry and asymmetry exist widely in natural science and engineering applications, and metal forming is no exception. Metal forming is the technology of producing metal artworks, which are widely used in the aerospace, automobile, construction, hardware industries, including for use in daily necessities, etc. In the metal forming process, there are many symmetry problems concerning material properties, boundary conditions, load loading, multi-field coupling, part structures, equipment, etc., which may directly affect the forming quality, cause defects of formed parts, or even fail to form. For example, material anisotropy, axisymmetric and non-axisymmetric parts, uneven deformation, straightening process, etc. The aim of the present Special Issue is, thus, to emphasize the phenomena of symmetry/asymmetry in metal forming. Manuscript types include original research papers, reviews, and letters. The Special Issue will cover all aspects of metal forming processes and must be related to symmetry, including the following:

  • Manufacturing processes and equipment
  • Materials behavior and characterization
  • Modeling and simulation
  • Deformation mechanics
  • Microstructure design by forming
  • Control and optimization.

Prof. Dr. Jun Zhao
Dr. Gaochao Yu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

14 pages, 7933 KiB  
Article
Stability Characteristics and Mechanism of U-Shaped Metal Bellows under Symmetrical Cyclic Tension and Compression Process
by Zengliang Hao, Biao Yao, Yuhang Chen and Junting Luo
Symmetry 2021, 13(12), 2451; https://doi.org/10.3390/sym13122451 - 20 Dec 2021
Cited by 2 | Viewed by 2639
Abstract
The U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC) [...] Read more.
The U-shaped metal bellows expansion joint compensates for the pipeline displacement by its own deformation. The compensation performance of the metal bellows in the initial stage of tension and compression deformation is unstable. In this paper, the symmetrical cyclic tension and compression (SCTC) process of metal bellows was simulated by ABAQUS software. Then, the SCTC process experiment of metal bellows was completed on the universal material testing machine. The distribution law of axial load with displacement and that of axial stiffness and yield load with cycles of metal bellows were obtained. Finally, the X-ray diffraction peak confirmed the deformation-induced martensite in the wave trough and proved that the plastic strain and hardness values of metal bellows increased with the displacement amplitude. The microstructure in the wave trough area was observed by a Zeiss microscope, and the stability characteristics mechanism of the metal bellows was revealed. The martensite in the wave trough increases the grain boundary area under SCTC loading. The forward movement of the slip band in the grain caused by large deformation reached an equilibrium state with the resistance at the grain boundary, which promotes the macroscopic mechanical properties of the metal bellows to be stable characteristics under SCTC loading. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Metal Forming)
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12 pages, 3776 KiB  
Article
Analytical Prediction of Stretch-Bending Springback Based on the Proportional Kinematic Hardening Model
by Ruixue Zhai, Zhuangkun Zhao, Jianhao Yang, Bangbang Ma and Gaochao Yu
Symmetry 2021, 13(12), 2389; https://doi.org/10.3390/sym13122389 - 11 Dec 2021
Cited by 1 | Viewed by 1740
Abstract
Pre-stretching and post-bending are the simplest loading methods for the profile stretch-bending technical process. The inner layers of the profile are stretched and then compressed during the loading process. Considering the Bauschinger effect of metal materials, a new material model called the proportional [...] Read more.
Pre-stretching and post-bending are the simplest loading methods for the profile stretch-bending technical process. The inner layers of the profile are stretched and then compressed during the loading process. Considering the Bauschinger effect of metal materials, a new material model called the proportional kinematic hardening model was proposed. The stretch-bending mechanical model was established under a pre-stretching and post-bending loading path. The stress and strain on the cross section of profiles were analyzed. The analytic expressions of curvature radius of the strain neutral layer and bending moment were derived after loading. The analytic method for determining the curvature radius of the geometric center layer after unloading and springback during stretch-bending was established. The rectangular section ST12 profile with symmetrical characteristics is adopted, the stretch-bending experimental results show that the new proportional kinematic hardening model is more accurate than the classical kinematic hardening model in predicting the stretch-bending springback. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Metal Forming)
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