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Metals
Special Issues
Advanced Flexible Forming Technologies
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Advanced Flexible Forming Technologies

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Metal Casting, Forming and Heat Treatment".

Deadline for manuscript submissions: closed (31 October 2022) | Viewed by 10085

Special Issue Editors

Prof. Dr. Lihui Lang

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Guest Editor
School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
Interests: sheet metal forming; composite materials; ductile fracture
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sergei Alexandrov

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Guest Editor
1. Laboratory of Technological Processes, Ishlinsky Institute for Problems in Mechanics of the Russian Academy of Sciences, 119526 Moscow, Russia
2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
Interests: plasticity theory; fracture mechanics; metal forming; structural mechanics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

Lightweight materials have the characteristics of low density and weight reduction, including titanium alloys, aluminum alloys, superalloys, copper alloys, composite materials and multi-materials structure composites, as well as plastic materials. Lightweight materials are widely used in advanced industries such as in the fields of aeronautics and astronautics. The development and application of lightweight materials has also put forward higher requirements for advanced forming technologies. Advanced flexible forming technologies refer to the forming technologies with few molds or without changing molds such as incremental forming, spinning, powder metallurgy and diffusion bonding. Especially for the parts made out of lightweight materials with many types and small quantities, the advanced flexible forming technologies have obvious advantages. Advanced flexible forming technologies also include the forming technologies with flexible media like gas, liquid, soft materials and solid particles, such as hot isostatic pressing, hydro-forming, rubber bladder forming, etc. Moreover, these technologies often use high temperature/high pressure to achieve good forming results. Nowadays, advanced flexible forming technologies have become important forming methods in the fields of aeronautics and astronautics, which also play an important role in the design and application of lightweight materials. This Special Issue aims to address the latest research related to advanced flexible forming technologies using high pressure/high temperature based on lightweight materials including titanium alloys, aluminum alloys, superalloys, copper alloys, composite materials and multi-materials structure composites, as well as plastic materials. Finally, the forming technologies are listed as follows:

  1. Hot isostatic pressing, hot pressing, powder metallurgy and other advanced high pressure/high temperature forming technologies;
  2. Hydro-forming and other fluid media-forming technologies;
  3. Diffusion bonding and other advanced joining technologies;
  4. Forming technologies of composite materials and multi-materials structure composites;
  5. Other advanced flexible forming technologies like incremental forming, spinning, rubber bladder forming, creep age forming, shot peening, extremely low temperature forming, high-speed forming including electric magnetic forming, electric hydro forming and explosive forming;
  6. Some other innovative forming technologies.

High-quality research articles are encouraged and welcome to be submitted to this Special Issue.

Prof. Dr. Lihui Lang
Prof. Dr. Sergei Alexandrov
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. Metals 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 2600 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.

Keywords

  • Lightweight materials
  • Composite materials
  • Multi-materials structure composites
  • Advanced flexible forming technologies
  • High pressure
  • High temperature
  • Forming technologies with flexible media
  • Hot isostatic pressing
  • Hydro-forming
  • Diffusion bonding

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Published Papers (3 papers)

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Research

14 pages, 2318 KiB  
Article
Synthesizing of Metallized Acrylic Containing Both Gadolinium and Lead as a Transparent Radiation Shielding Material and Its Physical Properties
by Bo Zhang, Fang Wang, Yanke Liu, Haoyu Yu, Yuansong Zeng and Lihui Lang
Metals 2022, 12(6), 990; https://doi.org/10.3390/met12060990 - 10 Jun 2022
Cited by 2 | Viewed by 1889
Abstract
In this study, a series of optically transparent metallized acrylics containing Gd and Pb were synthesized by the bulk polymerization of Gd(MAA)3, Pb(MAA)2 and AM according to different polymerization procedures. The variation of their optic transmittance and mechanical performance with [...] Read more.
In this study, a series of optically transparent metallized acrylics containing Gd and Pb were synthesized by the bulk polymerization of Gd(MAA)3, Pb(MAA)2 and AM according to different polymerization procedures. The variation of their optic transmittance and mechanical performance with Gd contents was investigated. Then, quasi-static uniaxial tensile tests under different strain rates and temperatures were performed to study the influence of strain rate and temperature on the mechanical properties of radiation-shielding metallized acrylic containing both Gd and Pb. The tensile responses of this material distinctly exhibit nonlinear characteristics and strongly depend on both temperature and strain rate. Based on the experimental results, a modified Zhu–Wang–Tang (ZWT) constitutive model, in which the standard elastic component was replaced by the Mooney–Rivlin hyperelastic model, was implemented to characterize the observed both hyperelastic and viscoelastic behaviors. The constitutive parameters were expressed as functions of temperature and determined by experimental data. The model fitting results indicate that the selected constitutive model can accurately describe the nonlinear tensile stress–strain responses of metallized acrylic containing Gd and Pb. Furthermore, the great difference in constitutive parameters implies that the viscoelastic behavior of the as-prepared metallized acrylic affects the response to quasi-static tensile loading the most. Full article
(This article belongs to the Special Issue Advanced Flexible Forming Technologies)
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16 pages, 13448 KiB  
Article
Observation of Vapor Plume Behavior and Process Stability at Single-Track and Multi-Track Levels in Laser Powder Bed Fusion Regime
by Hang Zheng, You Wang, Yinkai Xie, Shengkun Yang, Rui Hou, Yulong Ge, Lihui Lang, Shuili Gong and Huaixue Li
Metals 2021, 11(6), 937; https://doi.org/10.3390/met11060937 - 9 Jun 2021
Cited by 14 | Viewed by 4488
Abstract
Laser powder bed fusion (LPBF) is a promising additive manufacturing technology for producing metal parts with complex geometric features. However, the issue concerning process stability and repeatability still hinders its future acceptance by the industry. Gaining a better understanding of the behavior and [...] Read more.
Laser powder bed fusion (LPBF) is a promising additive manufacturing technology for producing metal parts with complex geometric features. However, the issue concerning process stability and repeatability still hinders its future acceptance by the industry. Gaining a better understanding of the behavior and stability of the evaporation process is an important step towards further insights into the complex interaction between laser and material. In this study, we used off-axis high-speed camera to observe vapor plume evolution in single-track formation on bare Ti-6Al-4V plates; the results showed that evaporation has a strong effect on melting quality even if the keyhole is not developed. We then expanded the experiments to multi-track level and found that the melting mode can change as the result of heat accumulation. The results show the possibility that keyhole regime may be reached even if it starts with a combination of parameters below the threshold for keyhole formation in single-track-level observation. Full article
(This article belongs to the Special Issue Advanced Flexible Forming Technologies)
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11 pages, 2465 KiB  
Article
A Modified M-K Method for Accurate Prediction of FLC of Aluminum Alloy
by Xiaoxing Li, Yangkai Chen, Lihui Lang and Rui Xiao
Metals 2021, 11(3), 394; https://doi.org/10.3390/met11030394 - 28 Feb 2021
Cited by 7 | Viewed by 2384
Abstract
Forming limit curve (FLC) is an important failure criterion for sheet metals in sheet metal forming, while the M-K model is widely used for the prediction of the FLC. In the M-K model, such prediction is greatly influenced by the initial thickness imperfection [...] Read more.
Forming limit curve (FLC) is an important failure criterion for sheet metals in sheet metal forming, while the M-K model is widely used for the prediction of the FLC. In the M-K model, such prediction is greatly influenced by the initial thickness imperfection factor and material properties, from which the original M-K model’s theoretical derivation is proposed as a solution to the above mentioned issue in this paper. Then the relationship between the M-K model and Keeler’s empirical formula is then studied, from which a new method to predict FLC is proposed that combines the M-K model with Keeler’s empirical formula according to the previous analyses. It turns out that this new method can simplify the calculation procedure. Finally, the experimental results of two kinds of aluminum alloys, AA6016 and AA5182, have verified the effectiveness of the proposed method. Full article
(This article belongs to the Special Issue Advanced Flexible Forming Technologies)
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