Residual Stresses Determination near FSW Joints by Combining the Hole Drilling Method and Reflection Hologram Interferometry

2021 ◽  
Vol 1037 ◽  
pp. 251-257
Author(s):  
Andrey V. Chernov ◽  
Igor N. Odintsev ◽  
Vladimir S. Pisarev
Keyword(s):  
Residual Stress ◽  
Local Deformation ◽  
Butt Joint ◽  
Hole Drilling ◽  
Friction Stir ◽  
Hole Drilling Method ◽  
Tool Shoulder ◽  
Stress Components ◽  
Reflection Hologram ◽  
Hologram Interferometry

The results of residual stress characterization near friction stir welded (FSW) butt joint of aluminum plates are reported. The experimental analysis employs two-side measurements of local deformation response on small hole drilling by reflection hologram interferometry. The approach developed is based on the unequivocally solution of the properly posed inverse problem thus deriving both membrane and bending residual stress components. Residual stress components of high level are derived inside the tool shoulder borders on both specimen faces.

Experimental Verification of the Hole Drilling Plasticity Effect Correction

2011 ◽  
Vol 681 ◽  
pp. 151-158 ◽  
Author(s):  
M. Beghini ◽  
Ciro Santus ◽  
Emilio Valentini ◽  
A. Benincasa
Keyword(s):  
Residual Stress ◽  
Stress Concentration ◽  
Numerical Procedure ◽  
Hole Drilling ◽  
Stressed Volume ◽  
Hole Drilling Method ◽  
Plasticity Effect ◽  
Drilling Method ◽  
Stress Components ◽  
Perturbation Effect

The Hole Drilling Method introduces a hole in a (residual) stressed volume of material, typically a metal, then a stress concentration follows. A portion of the volume near the hole can experience a stress concentration and then plasticity. The relaxed strains measured by the rosette strain gage grids are then affected by this plasticity volume especially when the residual stress is quite large with respect to the material yield stress. This is the so called Hole Drilling Plasticity Effect. The authors recently proposed a numerical procedure to correct this perturbation effect and retrieve more accurate residual stress components values. An experimental validation of this correction procedure is reported in the paper.

Study of Nonuniform In-Plane and In-Depth Residual Stress of Friction Stir Welding

2003 ◽  
Vol 125 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Min Ya ◽  
Fulong Dai ◽  
Jian Lu
Keyword(s):  
Residual Stress ◽  
Friction Stir Welding ◽  
Stress Gradient ◽  
High Stress ◽  
Hole Drilling ◽  
Friction Stir ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Longitudinal Residual Stress ◽  
Drilling Method

Friction stir welding (FSW) is a newly developed welding technique that can join aluminum alloys of low fusion weldability. The conventional hole-drilling method does not consider the nonuniform in-plane stress around the drilled hole, it is no longer valid for the residual stress of FSW which has high stress gradient. However, assuming the relaxation of in-plane nonuniform residual stress to be uniform on a small increment of the boundary of the hole, the recently developed Moire´ interferometry incremental hole-drilling (MIIHD) method can be used. Residual stress of a thin plate of friction stir welded aluminum alloy was studied by MIIHD. The longitudinal residual stress distribution in the transversal direction and through the thickness was obtained and compared with results by strain gage method.

Analysis of Residual Stress on FSW AA 6061 Using Hole-Drilling with ESPI for HFMI Treated Condition

2017 ◽  
Vol 890 ◽  
pp. 344-347 ◽  
Author(s):  
Mohamed Ackiel Mohamed ◽  
Yupiter H.P. Manurung ◽  
Markus Laakkonen
Keyword(s):  
Residual Stress ◽  
High Frequency ◽  
Speckle Pattern ◽  
Tensile Residual Stress ◽  
Electronic Speckle Pattern Interferometry ◽  
Hole Drilling ◽  
Friction Stir ◽  
Hole Drilling Method ◽  
Treated Condition ◽  
Drilling Method

Tensile residual stress in friction stir welded (FSW) Aluminum alloy joints is well known to be detrimental to fatigue resistance properties of joints imperiled to dynamic loading. Hence, it is important to translate the prevailing tensile residual stress to a more favorable compressive residual stress to enhance the fatigue life cycle of the welded joints. In this study, the longitudinal and transverse residual stress for FSW AA 6061 joints is measured using the hole-drilling method with electronic speckle pattern interferometry (ESPI) for various conditions. This method combines the tried-and-true hole-drilling method with digital imaging and ESPI, eliminating the application of a strain gage through stress depth profile measurements by incremental drilling. The residual stress is measured for the FSW as-welded and high frequency mechanical impact/pneumatic impact treatment (HFMI/PIT)-treated conditions.

scholarly journals Application of 3D DIC-Assisted Residual Stress Measurements for Friction Stir Welding Weld from Ultrafine-Grained Aluminum

2020 ◽  
Vol 52 (1) ◽  
pp. 20-25
Author(s):  
Tomasz Brynk ◽  
Marta Orłowska ◽  
Małgorzata Lewandowska
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Stress Measurement ◽  
Image Correlation ◽  
Hole Drilling ◽  
Friction Stir ◽  
Hole Drilling Method ◽  
3D Digital Image Correlation ◽  
Novel Approach ◽  
Ultrafine Grained

AbstractThe present study describes a novel approach applying 3D digital image correlation to a hole drilling method to measure residual stresses. Measurements were performed on a friction stir-welded joint made of ultrafine-grained aluminum. The results show that severe plastic deformation did not significantly change the residual stresses, while in the weld’s stir zone they increased to 100 to 200 MPa. The obtained results demonstrate the reliability of the applied residual stress measurement method.

Residual Stresses of Friction Stir Welded 2024-T4 Joints

2008 ◽  
Vol 580-582 ◽  
pp. 263-266 ◽  
Author(s):  
Ting Li ◽  
Qing Yu Shi ◽  
Hong Ke Li ◽  
Wei Wang ◽  
Zhi Peng Cai
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Weld Line ◽  
Fusion Welding ◽  
Hole Drilling ◽  
2024 Aluminum Alloy ◽  
Friction Stir ◽  
Hole Drilling Method ◽  
Tool Shoulder ◽  
Drilling Method

Friction stir welding (FSW) is a solid-state joining technique which can produce high-quality joints efficiently. The residual stresses in FSW are generated due to the effect of both the uneven temperature field and of the tool force, which is different from that in fusion welding. In this study the residual stresses of 3mm-thick 2024-T4 aluminum alloy FSW joints have been investigated by using the Hole-drilling method. To reduce the influence of drilling upon the experimental results, annealed stress-free 2024 aluminum alloy plates were drilled; the relieved strains were measured and were subtracted from the total strains measured from the joints. The results showed that the longitudinal residual stresses in the joint were much larger than the transverse residual stresses; high longitudinal tensile residual stresses were concentrated near the tool shoulder direct affected zone and asymmetrically distributed at the different sides of the weld line; i-e, high at the advancing side and relatively low at the retreating side. Outside the tool shoulder direct affected zone, the longitudinal residual stresses decreased rapidly and became compressive residual stresses away from the weld line; the peak of the longitudinal residual stresses was 164.5MPa.The mechanism of the generation of the residual stresses was analyzed preliminarily.

Sign in / Sign up

Export Citation Format

Share Document