scholarly journals An Experimental Study on Micro-Shear Clinching of Metal Foils by Laser Shock

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1422 ◽  
Author(s):  
Xinding Li ◽  
Xiao Wang ◽  
Zongbao Shen ◽  
Youjuan Ma ◽  
Huixia Liu
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Shear Test ◽  
Failure Modes ◽  
Dissimilar Materials ◽  
Laser Pulses ◽  
Laser Shock ◽  
Metal Foils ◽  
Process Characteristics ◽  
Similar Materials

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.

Ultrasonic Torsion Welding of Aging Resistant Al/CFRP Joints - Concepts, Mechanical and Microstructural Properties

2017 ◽  
Vol 742 ◽  
pp. 395-400 ◽  
Author(s):  
Florian Staab ◽  
Frank Balle ◽  
Johannes Born
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Materials Science ◽  
Dissimilar Materials ◽  
Material Design ◽  
Ultrasonic Welding ◽  
Fatigue Properties ◽  
Aviation Industry ◽  
Efficient Design ◽  
Engineering Structures

Multi-material-design offers high potential for weight saving and optimization of engineering structures but inherits challenges as well, especially robust joining methods and long-term properties of hybrid structures. The application of joining techniques like ultrasonic welding allows a very efficient design of multi-material-components to enable further use of material specific advantages and are superior concerning mechanical properties.The Institute of Materials Science and Engineering of the University of Kaiserslautern (WKK) has a long-time experience on ultrasonic welding of dissimilar materials, for example different kinds of CFRP, light metals, steels or even glasses and ceramics. The mechanical properties are mostly optimized by using ideal process parameters, determined through statistical test planning methods.This gained knowledge is now to be transferred to application in aviation industry in cooperation with CTC GmbH and Airbus Operations GmbH. Therefore aircraft-related materials are joined by ultrasonic welding. The applied process parameters are recorded and analyzed in detail to be interlinked with the resulting mechanical properties of the hybrid joints. Aircraft derived multi-material demonstrators will be designed, manufactured and characterized with respect to their monotonic and fatigue properties as well as their resistance to aging.

Mechanical Properties Evaluation of Friction Stir Welded AA6061-AA7075 Alloys for Different Tool pin Geometries

2019 ◽  
Vol 895 ◽  
pp. 295-300
Author(s):  
Rao R. Raghavendra ◽  
N. Bharath ◽  
S. Pradeep ◽  
C.K. Yogisha
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Dissimilar Materials ◽  
Hardness Test ◽  
Green Technology ◽  
Optimum Process ◽  
Tool Rotational Speed ◽  
Friction Stir ◽  
Solidification Cracks ◽  
Tool Pin

The friction stir welding is a solid state welding in which welding takes place at a temperature below the melting point. This welding is also known as green technology welding as no harmful gases are generated, as well as fluxes are not formed. In this process joining of two dissimilar materials can be achieved. Through this welding one can overcome defects like porosity, solidification, cracks etc by selecting suitable wilding parameters. Present work investigates the effect of different tool pin geometries on mechanical properties of friction stir welded AA6061 and AA7075 alloys keeping the process parameters constant. The welding is carried with process parameters 1000rpm, 50mm/min and 5KN as tool rotational speed, welding speed and axial load respectively, and for four different pin geometries: (a) cylindrical pin, (B) triangular pin, (c) square pin and (d) hexagonal pin. The welded samples are characterized by mechanical properties like tensile strength and micro Vickers hardness test. By considering the both properties the hexagonal pin shown better characteristics under optimum process parameters.

Analysis of Friction Stir Riveting Processes: A Review

2017 ◽  
Author(s):  
Haris Ali Khan ◽  
Jingjing Li ◽  
Chenhui Shao
Keyword(s):  
Mechanical Properties ◽  
Detailed Analysis ◽  
Fatigue Resistance ◽  
Process Parameters ◽  
Dissimilar Materials ◽  
Significant Rise ◽  
Operating Principle ◽  
Friction Stir ◽  
Microstructure Modification ◽  
Insight Into

This study presents a detailed analysis of friction stir riveting (FSR) processes that are used for joining similar as well as dissimilar materials. It covers the operating principle of FSR methods along with the insight into various process parameters responsible for successful joints formation. The paper further evaluates the research in friction stir-based riveting processes which unearth the enhanced metallurgical and mechanical properties for instance microstructure modification, local mechanical properties and improved strength, corrosion and fatigue resistance. The results of the study show that use of FSR process yields refined microstructures and improved mechanical properties in materials, which will entail a significant rise in the usage of friction stir-based riveting processes.

scholarly journals Power Ultrasonic Additive Manufacturing: Process Parameters, Microstructure, and Mechanical Properties

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Abdullahi K. Gujba ◽  
Mamoun Medraj
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Process Parameters ◽  
Dissimilar Materials ◽  
Structural Defects ◽  
Bond Quality ◽  
Ultrasonic Additive Manufacturing ◽  
Pull Out ◽  
Microstructure And Mechanical Properties ◽  
Metallic Parts

Additive manufacturing (AM) for fabricating 3D metallic parts has recently received considerable attention. Among the emerging AM technologies is ultrasonic additive manufacturing (UAM) or ultrasonic consolidation (UC), which uses ultrasonic vibrations to bond similar or dissimilar materials to produce 3D builds. This technology has several competitive advantages over other AM technologies, which includes fabrication of dissimilar materials and complex shapes, higher deposition rate, and fabrication at lower temperatures, which results in no material transformation during processing. Although UAM process optimization and microstructure have been reported in the literature, there is still lack of standardized and satisfactory understanding of the mechanical properties of UAM builds. This could be attributed to structural defects associated with UAM processing. This article discusses the effects of UAM process parameters on the resulting microstructure and mechanical properties. Special attention is given to hardness, shear strength, tensile strength, fatigue, and creep measurements. Also, pull-out, push-out, and push-pin tests commonly employed to characterize bond quality and strength have been reviewed. Finally, current challenges and drawbacks of the process and potential applications have been addressed.

scholarly journals Analyses of Friction Stir Riveting Processes: A Review

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Haris Ali Khan ◽  
Jingjing Li ◽  
Chenhui Shao
Keyword(s):  
Mechanical Properties ◽  
Fatigue Resistance ◽  
Process Parameters ◽  
Dissimilar Materials ◽  
Future Research ◽  
Joint Formation ◽  
Friction Stir Process ◽  
Friction Stir ◽  
Microstructure Refinement ◽  
Mechanical Fastening

This study presents detailed analyses of variant joining processes under the category of friction stir riveting (FSR) that are applied to assemble similar or dissimilar materials by integrating the advantages of both friction stir process and mechanical fastening. It covers the operating principle of FSR methods along with the insights into various process parameters responsible for successful joint formation. The paper further evaluates the researches in friction stir-based riveting processes, which unearth the enhanced metallurgical and mechanical properties, for instance microstructure refinement, local mechanical properties and improved strength, corrosion, and fatigue resistance. Advantages and limitations of the FSR processes are then presented. The study is concluded by summarizing the key analyses and proposing the potential areas for future research.

scholarly journals Experimental Study on the Mechanical Properties and Compression Size Effect of Recycled Aggregate Concrete

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2323
Author(s):  
Yubing Du ◽  
Zhiqing Zhao ◽  
Qiang Xiao ◽  
Feiting Shi ◽  
Jianming Yang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Size Effect ◽  
Compressive Stress ◽  
Failure Modes ◽  
Recycled Concrete ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Substitution Ratio ◽  
The Impact

To explore the basic mechanical properties and size effects of recycled aggregate concrete (RAC) with different substitution ratios of coarse recycled concrete aggregates (CRCAs) to replace natural coarse aggregates (NCA), the failure modes and mechanical parameters of RAC under different loading conditions including compression, splitting tensile resistance and direct shear were compared and analyzed. The conclusions drawn are as follows: the failure mechanisms of concrete with different substitution ratios of CRCAs are similar; with the increase in substitution ratio, the peak compressive stress and peak tensile stress of RAC decrease gradually, the splitting limit displacement decreases, and the splitting tensile modulus slightly increases; with the increase in the concrete cube’s side length, the peak compressive stress of RAC declines gradually, but the integrity after compression is gradually improved; and the increase in the substitution ratio of the recycled aggregate reduces the impact of the size effect on the peak compressive stress of RAC. Furthermore, an influence equation of the coupling effect of the substitution ratio and size effect on the peak compressive stress of RAC was quantitatively established. The research results are of great significance for the engineering application of RAC and the strength selection of RAC structure design.

scholarly journals Microstructure and Mechanical Properties of Al-Mg-Si Similar Alloy Laminates Produced by Accumulative Roll Bonding

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4200
Author(s):  
Zhigang Li ◽  
Hao Jiang ◽  
Minghui Wang ◽  
Hongjie Jia ◽  
Hongjiang Han ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Accumulative Roll Bonding ◽  
Thin Sheet ◽  
Heterogeneous Materials ◽  
Thick Sheet ◽  
Subsequent Aging ◽  
Roll Bonding ◽  
Roll Casting ◽  
Promotive Effect ◽  
Similar Materials

As the applications of heterogeneous materials expand, aluminum laminates of similar materials have attracted much attention due to their greater bonding strength and easier recycling. In this work, an alloy design strategy was developed based on accumulative roll bonding (ARB) to produce laminates from similar materials. Twin roll casting (TRC) sheets of the same composition but different cooling rates were used as the starting materials, and they were roll bonded up to three cycles at varying temperatures. EBSD showed that the two TRC sheets deformed in distinct ways during ARB processes at 300°C. Major recrystallizations were significant after the first cycle on the thin sheet and after the third cycle on the thick sheet. The sheets were subject to subsequent aging for better mechanical properties. TEM observations showed that the size and distribution of nano-precipitations were different between the two sheet sides. These nano-precipitations were found to significantly promote precipitation strengthening, and such a promotive effect was referred to as hetero-deformation induced (HDI) strengthening. Our work provides a new promising method to prepare laminated heterogeneous materials with similar alloy TRC sheets.

Sign in / Sign up

Export Citation Format

Share Document