Special Issue "Advances in Clinching Technology for Joining of Different Materials, Exploitation, and Strength-Testing Methods"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Structure Analysis and Characterization".

Deadline for manuscript submissions: 30 September 2020.

Special Issue Editor

Prof. Jacek Mucha
Website
Guest Editor
Rzeszow University of Technology, Rzeszów, Poland
Interests: joining of materials; clinching; joining technology; material characterization and testing; strength of materials; advanced joining techniques; stress analysis of joints

Special Issue Information

Dear Colleagues,

Designing and manufacturing products without using joints is impossible in most cases. Appropriate association and joining of each part of the products enables production on a functional form, which is able to meet the requirements of the consumers while maintaining the economic aspects of production. In general, the assembly process allows to obtain product structures with simple, very complex, and sometimes sophisticated spatial construction. In the mounting process, the use of separable joints, such as screw joints or bolt joints, is still popular. However, the use of inseparable joints is becoming more and more popular. They are cheaper and their processing time is shorter. From year to year, the demand for construction material with improved physicochemical and exploitation characteristics increases. Thus, the greatest research progress is observed in the area of materials science. The newly developed materials generate the need to improve and develop joining systems.

Product and process innovations cause changes in designing and manufacturing processes. Due to the increasing emphasis on economic and technological aspects, more and more companies are revising their approach to the concept of designing and manufacturing joints used to connect components made of new materials.

The main objective, in the field of fastening technologies, is the possibility of developing and offering a comprehensive joining solution of new materials, with different physicochemical properties, which will improve the economics of the manufacturing process. The main aims of improving old solutions and making new achievements of joining technologies are:

-   Increasing the availability of new materials use;

-   The improvement of the reliability of joints and their manufacturing process;

-   Increasing profitability and process automation;

-   Increasing the quality and repeatability of the joining process;

-   The possibility to join more than two material layers;

-   Increasing corrosion resistance in the joints area;

-   Miniaturization;

-   Increase of static and dynamic joint strength.

The use of the clinching joining process in automated manufacturing processes is increasing. The advantages of clinching joint use have made companies more and more willing to use well-developed and proven solutions. Thus, they can reduce assembly process time and costs. Undoubtedly, it is due to these advantages that the clinching process is used for series production of car bodies. The use of pressed joints helps to minimize assembly time or even eliminate additional operations related to the preparation of joining elements. It allows to join two, three, and even more material layers in a very short time. Joining by pressing is effective for assembly materials with significantly different mechanical properties. Joining materials, especially with different mechanical properties, requires an individual approach to choosing the tool shape and geometry. Hence, in literature, many studies on using clinching technologies for joining materials with different properties, thickness, and combinations can be found.

This Special Issue includes original research and review works regarding the aspects of joining technologies for steel, non-ferrous metal alloys, composites, hybrid materials, and other modern materials. This edition will allow to present the newest achievements related to joints strength tests, with the corrosion resistant, and with new developments in clinching technologies. Hence, new information about the trends in clinching systems applications for joining new materials with different physical and chemical properties will be included. The aspects of different environmental and strength tests conditions will be presented.

Prof. Jacek Mucha
Guest Editor

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 papers will be 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. Materials is an international peer-reviewed open access semimonthly 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 2000 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

  • Clinching 
  • Joining composites 
  • Hybrid joints 
  • Joints characterization and testing 
  • Joint corrosion and joint strength 
  • Modifications of clinching joining technologies

Published Papers (3 papers)

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Research

Open AccessArticle
An Experimental Study on Micro-Shear Clinching of Metal Foils by Laser Shock
Materials 2019, 12(9), 1422; https://doi.org/10.3390/ma12091422 - 01 May 2019
Abstract
This work proposes a micro-shear clinching process by laser shock for joining similar and dissimilar metal foils. The joint appearance and cross-section were investigated to determine basic process parameters. The soft punch thickness was 100 μm. The numbers of laser pulses on the [...] Read more.
This work proposes a micro-shear clinching process by laser shock for joining similar and dissimilar metal foils. The joint appearance and cross-section were investigated to determine basic process parameters. The soft punch thickness was 100 μm. The numbers of laser pulses on the upper and lower foil sides were set as two and one, respectively. Joint deformation was divided into three stages and we investigated the deformation law of the joints. The process windows of the Al foil combinations were acquired to determine a reasonable range of process parameters for obtaining qualified joints. The mechanical properties and failure modes of different joints were analyzed to identify the process characteristics. Mechanical properties were related to shear test directions and were influenced by upper and lower foil thicknesses. One failure mode was observed in the parallel shear test, and four failure modes were observed in the perpendicular shear test. These modes were determined by the differences between upper and lower foil thicknesses. Results showed that the proposed process can be used to join Al and Cu foils successfully. The laws governing the mechanical properties and failure modes of dissimilar materials were similar to those governing the mechanical properties and failure modes of similar materials. Full article
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Open AccessArticle
Modeling and Experimental Research on Resistance Spot Welded Joints for Dual-Phase Steel
Materials 2019, 12(7), 1108; https://doi.org/10.3390/ma12071108 - 03 Apr 2019
Cited by 2
Abstract
Dual-phase steel has been employed in the automotive industry as it has the advantages of high strength, satisfying ductility, low yield ratio, and so on. A novel framework for the weld nugget size prediction and control using finite element modeling and experimental research [...] Read more.
Dual-phase steel has been employed in the automotive industry as it has the advantages of high strength, satisfying ductility, low yield ratio, and so on. A novel framework for the weld nugget size prediction and control using finite element modeling and experimental research was proposed in this paper. The two-dimensional axisymmetric numerical analysis model was established and the phase transition on thermal expansion coefficient was taken into account. The whole welding process was simulated and discussed using thermal elastic-plastic theory. To validate the predictive methods of developed weld nugget size and confirmation experiments were implemented with the same input parameters in the ranges of process parameters. The simulated weld nugget sizes were in good agreement with the experimental results except for extreme welding conditions. The microstructure of the welding zone was also investigated based on metallographic experiments and temperature field analysis. The welding parameters were adjusted using the model proposed in this paper so as to obtain the nugget size with pull out failure mode. Full article
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Open AccessArticle
Designing and Testing Cold-Formed Rounded Connections Made on a Prototype Station
Materials 2019, 12(7), 1061; https://doi.org/10.3390/ma12071061 - 31 Mar 2019
Cited by 1
Abstract
This paper presents the design of cold-formed rounded connections between a tube and a connecting block and the analysis of test results that were carried out with six fabricated samples. The joints manufactured on a specially designed prototype station were made by forming [...] Read more.
This paper presents the design of cold-formed rounded connections between a tube and a connecting block and the analysis of test results that were carried out with six fabricated samples. The joints manufactured on a specially designed prototype station were made by forming tools that were adjusted to connecting elements regarding the diameter and the shape. All of the samples prepared for this study were of the same diameters relating to the diameter of a hole in a connecting block and the outer diameter of a pipe flange. However, they were different concerning the height of the connecting block flange. The article presents features of joints that were manufactured with a designed forming tool on the prototype station. The achieved connections were examined in destructive testing (Micrography, Tensile Strength Test) and in non-destructive testing (Leakage Test). The research project aims were to state the differences in energy consumption of made connections and extend the concept of cold-formed rounded connections. Furthermore, this article presents the effects of FEA simulation of the cold-formed joint based on the results of destructive and non-destructive tests. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

1. Title: Rivetless Stamping Joint of CFRP/Aluminum Alloy Sheet with Prepreg Sandwich Structure

Authors: Jian WANG, Yue YU, CHang-yun FU, Hong Xiao, Wei ZHU,Xue-feng ZHENG, Jia-teng LI,Guang-wu ZHANG

2. Title: Mechanical Joining of Car Body High-Strength Steels as an Alterantive to Resistance Spot Welding

Authors: KAŠČÁK Ľuboš, MUCHA Jacek, SPIŠÁK Emil

3. Title: Analysis of using an additional rivet in the forming process of the clinching joints for AW5754 and AW6082 aluminum alloy sheets.

Authors: KAŠČÁK Ľuboš, MUCHA Jacek, WITKOWSKI Waldemar

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