Microstructure and Fracture Behavior of Refill Friction Stir Spot Welded Joints of AA2024 Using a Novel Refill Technique

Deng, Lei; Li, Shuhan; Ke, Liming; Liu, Jinhe; Kang, Jidong

doi:10.3390/met9030286

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…When a torsional load is applied to the drive shaft, this leads to the development of a buckling load or torque. The buckling behavior of graphite/epoxy shafts under torsional loading was investigated by [21], who discovered that theoretical and experimental results agreed with one another in a satisfactory manner. It was discovered that increasing the layer count of filament wound hybrid carbon/glass composite shafts improved the torsional performance of the shafts [22].…”

Section: Literature Review and Problem Statementmentioning

confidence: 95%

Identifying the mechanism of the fatigue behavior of the composite shaft subjected to variable load

Al-Fahad

Sharaf

Bachache

et al. 2023

EEJET

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This paper presents a finite element analysis of a composite shaft under dynamic variable fatigue loading. The object of this study is the behavior of the fatigue life of a composite shaft under dynamic variable fatigue loading. The fatigue life of the shaft is then determined by analyzing the stress distribution and its effect on the material's fatigue strength. The investigation of fatigue behavior involves evaluating factors such as stress concentrations, fatigue crack initiation and propagation, and the cumulative damage caused by cyclic loading. The study explores the impact of biaxial loading on the shaft's fatigue performance and provides insights into its significance in predicting fatigue life and it is 10e7 cycles. Furthermore, a damage indicator is predicted to assess the accumulated damage and monitor the progression of fatigue-related degradation. This indicator serves as a valuable tool for predicting the remaining useful life of the composite shaft. The equivalent alternative stress is calculated to characterize the combined effect of different loading conditions on the fatigue life of the composite shaft. By quantifying the stress level and variations experienced by the structure, this parameter allows for a comprehensive assessment of the fatigue performance under variable loading scenarios 250 N. The findings of this research contribute to the understanding of fatigue behavior in composite shafts under dynamic variable fatigue loading. The insights gained from the fatigue life investigation, biaxiality indication, damage prediction, and equivalent alternative stress calculation can aid in optimizing design considerations, maintenance planning, and enhancing the reliability and durability of composite shafts in various engineering applications

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Section: Literature Review and Problem Statementmentioning

confidence: 95%

Identifying the mechanism of the fatigue behavior of the composite shaft subjected to variable load

Al-Fahad

Sharaf

Bachache

et al. 2023

EEJET

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show abstract

“…They suggested that the worn shoulder surface reduced the lap shear strength of the joints while all the tested welds surpassed the minimum standard lap shear strength requirements for aeronautical applications [80]. Numerous studies are available in the literature investigating the RF-SSW of various aluminum alloys such as AA7075 [95][96][97], AA7050 [98], AA2024 [99,100], AA2198 [80], AA2014 [101], AA6061 [102,103], AA2219 [93], dissimilar Al alloys [102,104], dissimilar Al/steel [105], Mg alloys [9,106,107], dissimilar Mg, and steel [7].…”

Section: Friction Stir Spot Weldingmentioning

confidence: 99%

Friction Stir Welding of Aluminum in the Aerospace Industry: The Current Progress and State-of-the-Art Review

et al. 2023

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The use of the friction stir welding (FSW) process as a relatively new solid-state welding technology in the aerospace industry has pushed forward several developments in different related aspects of this strategic industry. In terms of the FSW process itself, due to the geometric limitations involved in the conventional FSW process, many variants have been required over time to suit the different types of geometries and structures, which has resulted in the development of numerous variants such as refill friction stir spot welding (RFSSW), stationary shoulder friction stir welding (SSFSW), and bobbin tool friction stir welding (BTFSW). In terms of FSW machines, significant development has occurred in the new design and adaptation of the existing machining equipment through the use of their structures or the new and specially designed FSW heads. In terms of the most used materials in the aerospace industry, there has been development of new high strength-to-weight ratios such as the 3rd generation aluminum–lithium alloys that have become successfully weldable by FSW with fewer welding defects and a significant improvement in the weld quality and geometric accuracy. The purpose of this article is to summarize the state of knowledge regarding the application of the FSW process to join materials used in the aerospace industry and to identify gaps in the state of the art. This work describes the fundamental techniques and tools necessary to make soundly welded joints. Typical applications of FSW processes are surveyed, including friction stir spot welding, RFSSW, SSFSW, BTFSW, and underwater FSW. Conclusions and suggestions for future development are proposed.

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“…The repaired joints exhibited a flat surface and achieved 77% of the base material's strength. Deng et al [14] employed a similar filling technique, and changed the repair method to resistance spot welding (RSW). The tensile properties of the repaired joint were 33% better than those of the exit-hole, but the hardness of filling materials was significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Exit-hole repairing in 7475 aluminium alloy welded joints based on refill friction stir processing

Yuan

Kang

Jiang

et al. 2023

Science and Technology of Welding and Joining

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In this study, the refill friction stir processing (RFSP) method was utilised to repair a exit-hole defect located at the end of the friction stir welding (FSW) joints in 7475 aluminium alloy plate. The morphology, macroscopic defects, and mechanical properties of the repaired joints were investigated. The results demonstrate that the exit-hole was successfully refilled after RFSP. Material flow caused the refill voids, annular grooves, and un-stirred material defects. The maximum strength reached 415 Mpa, equal to 105% of the base defect-free weld. The mechanical properties of repaired joint were largely influenced by the stir zone (SZ) boundary and un-stirred material defects.

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Microstructure and Fracture Behavior of Refill Friction Stir Spot Welded Joints of AA2024 Using a Novel Refill Technique

Cited by 9 publications

References 17 publications

Identifying the mechanism of the fatigue behavior of the composite shaft subjected to variable load

Identifying the mechanism of the fatigue behavior of the composite shaft subjected to variable load

Friction Stir Welding of Aluminum in the Aerospace Industry: The Current Progress and State-of-the-Art Review

Exit-hole repairing in 7475 aluminium alloy welded joints based on refill friction stir processing

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