Methods of Determining the Endurance Limit of Butt Weld Joints after High-Frequency Mechanical Peening

The effect of high-frequency mechanical peening conditions on the fatigue resistance of 3sp steel butt weld joints was studied. Different techniques of preparing test specimens offered a conclusion that the quantitative contribution from residual compression stresses, strain hardening of the surface...

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Bibliographic Details
Published in:Strength of materials 2022-05, Vol.54 (3), p.415-423
Main Author: Degtyarev, V. O.
Format: Article
Language:English
Subjects:
Amplitudes
Analysis
Base metal
Butt joints
Butt welds
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Fatigue strength
Grooves
Hardness
Hardness measurement
Materials Science
Metal fatigue
Methods
Microhardness
Peening
Solid Mechanics
Strain hardening
Stress concentration
Surface layers
Vibration
Welded joints
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Summary:The effect of high-frequency mechanical peening conditions on the fatigue resistance of 3sp steel butt weld joints was studied. Different techniques of preparing test specimens offered a conclusion that the quantitative contribution from residual compression stresses, strain hardening of the surface layer of the groove formed after peening of the narrow zone of weld fusion with the base metal, and stress concentration variations to the enhancement of the endurance limit of weld joints makes up 57, 37, and 6%, respectively. The groove depth was shown to correlate with the depth of a plastically strained material layer. The procedures were advanced to evaluate the endurance limit of butt welds after different conditions of peening in the groove depth and plastically strained material layer under its bottom, using experimental data on the microhardness measurement depth, as well as in an examined range of variations of the tool vibration amplitudes. The groove depth against the travel speed and peening tool vibration amplitude, as well as endurance limit variations after different production techniques, were established. With the peening speed irrespective of the tool vibration amplitude, the efficiency of increasing the fatigue resistance of weld joints was shown to decrease, at a speed of 0.4 m/min, the endurance limit increases by 11% due to strain hardening, and the total effect of all the factors typical of peening results in its 26% growth.
ISSN:0039-2316
1573-9325
DOI:10.1007/s11223-022-00417-z