scholarly journals Influence of Adhesive in FSW: Investigation on Fatigue Behavior of Welded, Weld-Bonded, and Adhesive-Bonded Joints in Aluminum AA 6082 T6

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1242 ◽  
Author(s):  
Enrico Lertora ◽  
Chiara Mandolfino ◽  
Marco Pizzorni ◽  
Carla Gambaro
Keyword(s):  
Dynamic Behavior ◽  
Adhesive Bonding ◽  
Fatigue Behavior ◽  
Surface Preparation ◽  
Experimental Tests ◽  
Bonded Joints ◽  
Friction Stir ◽  
Negative Effect ◽  
Aeronautical Industry ◽  
Adhesive Bonded Joints

Friction stir welding (FSW) is a solid-state technique, which has assumed an increasingly important role in automotive, naval, and aeronautical industry over the years. Nowadays, thanks to its several benefits, FSW is used to weld any type of metallic, polymeric, or composite material. In recent decades, adhesive bonding has also enhanced relevance due to a request for much lighter structures to increase performance without increasing fuel consumption. From a mechanical perspective, welding has a high tensile strength despite a low fatigue resistance through the lack of joint elasticity. Therefore, the aim of this study is to investigate and compare static and dynamic behavior of welded, weld-bonded, and adhesive-bonded joints. After choosing the most suitable adhesive, surface preparation, consisting of sandblasting, was carried out. First of all, on the basis of previous experience in FSW, the process parameters of hybrid welding were determined. Both quasi-static and dynamic behavior of welded, adhesive-bonded, and weld-bonded joints, made in overlapped configuration, were then compared. Experimental tests showed that the adhesive limits the negative effect, due to the presence of the structural notch of FSW overlapped joints.

The Effect of Geometry and Material Properties on the Load Capacity of Single-Strapped Adhesive Bonded Joints

2008 ◽  
Vol 399 ◽  
pp. 89-96 ◽  
Author(s):  
Marin Sandu ◽  
Adriana Sandu ◽  
Dan Mihai Constantinescu ◽  
Ştefan Sorohan
Keyword(s):  
Adhesive Bonding ◽  
Load Capacity ◽  
Dissimilar Materials ◽  
Adhesive Layer ◽  
Adhesive Bond ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesive Bonded Joints ◽  
Major Factors ◽  
Selection Of

Adhesive bonding is a particularly effective method of assembling complex structures, especially those made from dissimilar materials. If the joint is well designed and correctly executed, the adhesive bond ought to be one of the strongest components of the structure and most certainly should not be the reason for reducing the load capacity or fatigue life. The major factors determining the integrity of an adhesive bond are selection of the most appropriate adhesive, joint design, preparation of the bonding surfaces, strict quality control in production and monitoring in service. This work focuses on the evaluation of the load capacity of some configurations of adhesively bonded single-strapped joints based on finite element analyses. The adhesive layer thickness, the overlap length, the adherent and strap thicknesses were varied as well as the materials properties.

Fatigue Prediction by Thermographic Method of Aluminum Alloy 6082 Panels: Comparison Between FSW and MIG Welding

2007 ◽  
Vol 23 (04) ◽  
pp. 215-222
Author(s):  
Vincenzo. Crupi ◽  
Alberto. Marinò ◽  
Marco Biot ◽  
Giacomo. Risitanoison
Keyword(s):  
Aluminum Alloy ◽  
Welded Joints ◽  
Fatigue Behavior ◽  
Experimental Tests ◽  
Mig Welding ◽  
Friction Stir ◽  
Traditional Procedure ◽  
Thermographic Analysis ◽  
Good Agreement

This paper focuses on the fatigue behavior of aluminum alloy welded joints, which can represent points of weakness in the ship structure. The traditional methods of fatigue assessment of welded joints have some limitations and are extremely time consuming. The Risitano method, based on thermographic analysis, has been applied to overcome these difficulties by predicting the fatigue behavior of welds. Experimental tests have been carried out to assess and compare the fatigue capability(S-N curves, endurance limits) of different welded joints, obtained by means of friction stir welding (FSW) and metal inert gas (MIG) welding. Fatigue predictions obtained resorting to the thermographic method (TM) show good agreement with those derived from the traditional procedure. Thus, TM proves to be a powerful tool also for the characterization of the kind of welded joints mentioned.

scholarly journals Degradation medium of agrocomplex – adhesive bonded joints interaction

2012 ◽  
Vol 58 (No. 3) ◽  
pp. 83-91 ◽  
Author(s):  
M. Müller ◽  
P. Valášek
Keyword(s):  
Adhesive Bonding ◽  
Adhesive Layer ◽  
Adhesive Bond ◽  
Bonded Joints ◽  
Technology Application ◽  
Degradation Processes ◽  
Current Interaction ◽  
Bonding Technology ◽  
Degradation Medium ◽  
Adhesive Bonded Joints

Research of degradation medium occurring in agrocomplex at the current interaction with bonded joints strength and lifetime is desired owing to the possibilities of bonding applications in this dynamically developing field. The bonding technology is used in construction of machines, lines and devices of agriculture, forestry and food industry. Among the perspectives of bonding technologies the adhesive bonding can be considered thanks to its predominant pluses. At the bonding technology or more precisely adhesive bonding technology application the limits must be characterized, which occur in the process of application in the concrete medium. On the basis of characteristics and analyses the countermeasures eliminating the negative factors can be taken. Published results set themselves the goal to know degradation processes taking place in bonded joints contemporarily with taking account of adhesive/adherend interaction with accent on application in agriculture. Experimentally found results confirm the presumption of a significant portion of the adhesive layer on the adhesive bond strength decrease in the practice due to the degradation processes.

Fracture Mechanics Characterization of Composite/Metal Interfaces of Bonded Joints

2007 ◽  
Vol 334-335 ◽  
pp. 361-364
Author(s):  
Won Seok Kim ◽  
Jung Ju Lee
Keyword(s):  
Adhesive Bonding ◽  
Load Condition ◽  
Tensile Load ◽  
Structural Features ◽  
Lap Joints ◽  
Bonded Joints ◽  
Singular Stress ◽  
Engineering Structures ◽  
Load Bearing ◽  
Adhesive Bonded Joints

Adhesive bonding between different materials has been widely used for a large variety of applications, such as in the aircraft, automotive, and many other civil engineering structures. Adhesive-bonded joints as load bearing components have the potential to save significant weight and cost over conventional riveted or bolted joints. For the last ten years a major problem in adhesive technology has been the difficulty in predicting the accurate load bearing capacity of a joint. This difficulty comes from the fact that the stress distribution in the adhesive joint is very complex and singular stress field exists at the bi-material corner. And for bonded joints, the failure usually occurs at the adhesive/adherend interface. Therefore another difficulty comes from the complex interfacial failure analysis due to the formation of chemical bonds, whose strengths are difficult to measure. Many studies have been conducted to investigate the effects of bond thickness, material properties of adhesives and adherends, and geometric shape of bi-material corner tip to the fracture behavior of bonded joints. In this paper, we analyze the stress fields at the interface corner of composite/steel(anisotropic/isotropic) double lap joint to predict failure by using stress intensity based fracture criterion. And analytical results are compared with experimental results of co-cured lap joints under tensile load condition. Micro-structural features, hardness characteristics, and fracture toughness determinations of the interfaces are also conducted.

scholarly journals Tests of Technological Conditions of the Resistance Welding and Adhesive Bonding of Coated Steel Sheets

2021 ◽  
pp. 17-30
Author(s):  
Szymon Kowieski ◽  
Jolanta Matusiak
Keyword(s):  
Isopropyl Alcohol ◽  
Adhesive Bonding ◽  
Protective Coatings ◽  
Adhesive Layer ◽  
Organic Coating ◽  
Epoxy Adhesive ◽  
Bonded Joints ◽  
Technological Parameters ◽  
Steel Sheets ◽  
Adhesive Bonded Joints

The article presents the effect of welding technological parameters and adhesive bonding conditions (surface processing, overlap dimensions and the thickness of the adhesive layer) on the formation of hybrid (welded-adhesive bonded) joints of steel sheets provided with protective coatings. The tests involved the joining of sheets made of steel HC340LA. The sheets made of steel HC340LA (provided with a ZE50/50 Granocoat ZE two-layer organic coating) were in the as-received state and after cleaning with isopropyl alcohol. The tests also involved sheets made of steel 22MnB5 provided with an AlSi coating. The sheets made of steel 22MnB5 were subjected to heat treatment, cleaning with isopropyl alcohol, roughening and etching in similar configurations. The adhesive bonding process was performed applying one-component epoxy adhesive (used in the automotive industry).

scholarly journals On bending fatigue behavior of adhesive bonded joints of FRP.

1986 ◽  
Vol 35 (392) ◽  
pp. 539-544
Author(s):  
Satoshi OKUDA ◽  
Shuji NISHINA ◽  
Tetsuo WATANABE
Keyword(s):  
Fatigue Behavior ◽  
Bonded Joints ◽  
Bending Fatigue ◽  
Adhesive Bonded Joints

Overlap Friction Stir Welding and Adhesive Bonding AA6082 joints Fatigue

Authorea ◽  
2020 ◽  
Author(s):  
Ricardo Maciel ◽  
Tiago Bento ◽  
Daniel F O Braga ◽  
Lucas da Silva ◽  
Pedro Moreira ◽  
...  
Keyword(s):  
Friction Stir Welding ◽  
Adhesive Bonding ◽  
Friction Stir

scholarly journals Defects and uncertainties of adhesively bonded composite joints

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Sadik Omairey ◽  
Nithin Jayasree ◽  
Mihalis Kazilas
Keyword(s):  
Composite Materials ◽  
Composite Structures ◽  
Production Efficiency ◽  
Adhesive Bonding ◽  
Detection Methods ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Wide Range ◽  
Bonded Composite

AbstractThe increasing use of fibre reinforced polymer composite materials in a wide range of applications increases the use of similar and dissimilar joints. Traditional joining methods such as welding, mechanical fastening and riveting are challenging in composites due to their material properties, heterogeneous nature, and layup configuration. Adhesive bonding allows flexibility in materials selection and offers improved production efficiency from product design and manufacture to final assembly, enabling cost reduction. However, the performance of adhesively bonded composite structures cannot be fully verified by inspection and testing due to the unforeseen nature of defects and manufacturing uncertainties presented in this joining method. These uncertainties can manifest as kissing bonds, porosity and voids in the adhesive. As a result, the use of adhesively bonded joints is often constrained by conservative certification requirements, limiting the potential of composite materials in weight reduction, cost-saving, and performance. There is a need to identify these uncertainties and understand their effect when designing these adhesively bonded joints. This article aims to report and categorise these uncertainties, offering the reader a reliable and inclusive source to conduct further research, such as the development of probabilistic reliability-based design optimisation, sensitivity analysis, defect detection methods and process development.

scholarly journals Fatigue Modeling and Numerical Analysis of Re-Filling Probe Hole of Friction Stir Spot Welded Joints in Aluminum Alloys

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2171
Author(s):  
Armin Yousefi ◽  
Ahmad Serjouei ◽  
Reza Hedayati ◽  
Mahdi Bodaghi
Keyword(s):  
Experimental Data ◽  
Tensile Strength ◽  
Fatigue Life ◽  
Fatigue Strength ◽  
Fatigue Behavior ◽  
Element Model ◽  
Plastic Strain Amplitude ◽  
Friction Stir ◽  
Probe Hole ◽  
Good Agreement

In the present study, the fatigue behavior and tensile strength of A6061-T4 aluminum alloy, joined by friction stir spot welding (FSSW), are numerically investigated. The 3D finite element model (FEM) is used to analyze the FSSW joint by means of Abaqus software. The tensile strength is determined for FSSW joints with both a probe hole and a refilled probe hole. In order to calculate the fatigue life of FSSW joints, the hysteresis loop is first determined, and then the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted. The results were verified against available experimental data from other literature, and a good agreement was observed between the FEM results and experimental data. The results showed that the joint’s tensile strength without a probe hole (refilled hole) is higher than the joint with a probe hole. Therefore, re-filling the probe hole is an effective method for structures jointed by FSSW subjected to a static load. The fatigue strength of the joint with a re-filled probe hole was nearly the same as the structure with a probe hole at low applied loads. Additionally, at a high applied load, the fatigue strength of joints with a refilled probe hole was slightly lower than the joint with a probe hole.

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