研究目的
Assessment of acoustic emission (AE) method for defect formation control during the process of aluminum alloys FSW.
研究成果
The acoustic emission method shows potential applicability for defect formation control during FSW of aluminum alloys. Monitoring the stress-strain state by the laser-ultrasonic method can enhance the interpretation of AE signals, indicating structural inhomogeneities in welded joints.
研究不足
The study is limited to aluminum-magnesium alloy and may not be directly applicable to other materials without further research. The accuracy of stress measurements is affected by the acoustoelastic coefficient Kυ, which requires calibration for each material.
1：Experimental Design and Method Selection:
The study employed laser ultrasound and acoustic emission non-destructive testing methods to monitor friction stir welds during deformation and fracture.
2：Sample Selection and Data Sources:
Specimens were made of butt welded joints produced by FSW from high strength aluminium magnesium alloy.
3：List of Experimental Equipment and Materials:
Dual element transducer for LSW generation and receiving, piezoelectric acoustic emission transducers (AET), preamplifier.
4：Experimental Procedures and Operational Workflow:
Static uniaxial tensile tests were performed with a constant loading rate of
5：2 kN·s-1 at a temperature of +23 oC. AE signals were recorded and analyzed. Data Analysis Methods:
The speed of longitudinal subsurface wave (LSW) was measured for stress estimation. AE parameters like count event NΣ, rate event count N’Σ, and signal rise time Δt were analyzed.
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