Feasibility of Local Stress Relaxation by Laser Annealing and X‐ray Measurement

Barile, Claudia; Casavola, Caterina; Pappalettera, Giovanni; Pappalettere, Carmine

doi:10.1111/str.12045

Cited by 27 publications

(10 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several techniques can be used to measure residual stresses in metal components [ 18 , 19 , 20 , 21 , 22 ], but just some of these techniques are both quantitative and non-destructive. X-ray diffraction is probably the most widespread technique to measure the residual stress on the surface because it allows mapping the stress field, point by point, quite rapidly, keeping unchanged, the characteristics of the component.…”

Section: Experimental Tests and Finite Element Analysismentioning

confidence: 99%

Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy

et al. 2013

View full text Add to dashboard Cite

Friction Stir Welding (FSW) is a solid-state joining process; i.e., no melting occurs. The welding process is promoted by the rotation and translation of an axis-symmetric non-consumable tool along the weld centerline. Thus, the FSW process is performed at much lower temperatures than conventional fusion welding, nevertheless it has some disadvantages. Laser Assisted Friction Stir Welding (LAFSW) is a combination in which the FSW is the dominant welding process and the laser pre-heats the weld. In this work FSW and LAFSW tests were conducted on 6 mm thick 5754H111 aluminum alloy plates in butt joint configuration. LAFSW is studied firstly to demonstrate the weldability of aluminum alloy using that technique. Secondly, process parameters, such as laser power and temperature gradient are investigated in order to evaluate changes in microstructure, micro-hardness, residual stress, and tensile properties. Once the possibility to achieve sound weld using LAFSW is demonstrated, it will be possible to explore the benefits for tool wear, higher welding speeds, and lower clamping force.

show abstract

Section: Experimental Tests and Finite Element Analysismentioning

confidence: 99%

Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy

et al. 2013

View full text Add to dashboard Cite

show abstract

“…The residual stress measurement is the relevant task for the characterization of a welded structure. Several techniques have been developed during time, 24,25 but just some of these are quantitative and non-destructive. One of these and probably the most used technique is X-ray diffraction that can measure the residual stress on the surface of the structures without damaging.…”

Section: Methodsmentioning

confidence: 99%

Influence of the clamps configuration on residual stresses field in friction stir welding process

Casavola

Cazzato

Moramarco

et al. 2015

The Journal of Strain Analysis for Engineering Design

View full text Add to dashboard Cite

Friction stir welding is a joining process developed in 1991 by The Welding Institute. This welding technique is a solid-state joining process leading to joints with good mechanical performance and low residual stresses. In all welding techniques, the clamping systems have an important role in determining the quality of the welds and mechanical characteristics. Even more in friction stir welding, the position of the clamps plays a critical role because it is mainly a mechanical process with high forces involved. In this article, the correlation between the residual stress field and configurations of clamps has been established numerically. For this purpose an uncoupled thermo-mechanical finite element analysis has been carried out. The mechanical loads due to the tool have been also implemented into the model. The thermal and mechanical models have been validated on temperature field recorded by an infrared camera and residual stress field measured by X-ray diffraction analysis. The friction stir welding test was conducted on 6-mm-thick 5754 H111 aluminium alloy plates.

show abstract

“…Hung et al [10] have used shearography in conjunction with a small ball indentation instead of a hole and also a phase shift shearography [11] was adopted. Also the possibility to release residual stresses by using local heat treatment, as in [12], was used by Pechersky et al [13] combined with digital speckle pattern interferometry (DSPI). Instead Zhang [14] has investigated the practicability of the combination between DSPI and hole drilling.…”

Section: Introductionmentioning

confidence: 99%

Considerations on the choice of experimental parameters in residual stress measurements by hole-drilling and ESPI

Barile

Casavola

Pappalettera

et al. 2014

Frattura Ed Integrità Strutturale

Self Cite

View full text Add to dashboard Cite

Residual stresses occur in many manufactured structures and components. Great number of investigations have been carried out to study this phenomenon. Over the years, different techniques have been developed to measure residual stresses; nowadays the combination of Hole Drilling method (HD) with Electronic Speckle Pattern Interferometry (ESPI) has encountered great interest. The use of a high sensitivity optical technique instead of the strain gage rosette has the advantage to provide full field information without any contact with the sample by consequently reducing the cost and the time required for the measurement. The accuracy of the measurement, however, is influenced by the proper choice of several parameters: geometrical, analysis and experimental. In this paper, in particular, the effects of some of those parameters are investigated: misknowledgment in illumination and detection angles, the influence of the relative angle between the sensitivity vector of the system and the principal stress directions, the extension of the area of analysis and the adopted drilling rotation speed. In conclusion indications are provided to the scope of optimizing the measurement process together with the identification of the major sources of errors that can arise during the measuring and the analysis stages.

show abstract

Feasibility of Local Stress Relaxation by Laser Annealing and X‐ray Measurement

Cited by 27 publications

References 24 publications

Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy

Analysis and Comparison of Friction Stir Welding and Laser Assisted Friction Stir Welding of Aluminum Alloy

Influence of the clamps configuration on residual stresses field in friction stir welding process

Considerations on the choice of experimental parameters in residual stress measurements by hole-drilling and ESPI

Contact Info

Product

Resources

About