研究目的
Investigating the effect of overlapping on the resulting residual stress fields in laser-peened aluminium sheets.
研究成果
An increase in overlapping in laser peening induces more compressive and deeper residual stress fields in thin aluminium sheets, which is beneficial for inhibiting or delaying crack initiation and propagation, thereby improving fatigue life.
研究不足
The study focuses on thin-section aerospace aluminium alloy and may not be directly applicable to other materials or thicknesses. The effect of surface roughness on fatigue performance was not deeply investigated.
1：Experimental Design and Method Selection:
Two different laser peening systems were used to peen 2.0-mm-thick aluminium sheets with varying amounts of overlapping. Residual stresses were measured by incremental hole drilling.
2：0-mm-thick aluminium sheets with varying amounts of overlapping. Residual stresses were measured by incremental hole drilling.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: 2.0-mm-thick Al2024-T351 sheets with Al-cladding were used. Samples were prepared in specific sizes for each laser peening system.
3：0-mm-thick Al2024-T351 sheets with Al-cladding were used. Samples were prepared in specific sizes for each laser peening system.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Laser peening systems (LP System 1 and LP System 2), incremental hole drilling set-up by Stresscraft, UK, with a 1.6 mm-diameter orbital driller.
4：6 mm-diameter orbital driller.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Laser peening was applied with water overlay. Residual stress measurements were conducted at the center of the laser-peened regions using incremental hole drilling.
5：Data Analysis Methods:
Measured strains were evaluated by Stresscraft RS INT using the integral method.
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