研究目的
To evaluate the feasibility of using laser-induced breakdown spectroscopy (LIBS) to determine the stress generated in metal materials by comparing measured stress levels with those determined by x-ray diffraction (XRD).
研究成果
The study confirmed the potential for stress measurement using LIBS by demonstrating a correlation between the stress state of the metal matrix and the spectral line strength of LIBS. However, further research is needed to obtain quantitatively reliable results with a small number of laser measurements.
研究不足
The study found that as the hole processed by the LIBS method becomes deeper, signal interference and measurement sensitivity limit effective measurement. The exact correlation between LIBS and XRD for quantitative values of stress can be difficult to resolve due to the complexity of spectral lines obtained through LIBS.
1：Experimental Design and Method Selection:
The study used LIBS and XRD to measure stress in metal materials. LIBS was used to analyze the correlation between stress distribution and the ratio of ionic to atomic spectral line intensity. XRD was used as a reference method for stress measurement.
2：Sample Selection and Data Sources:
Two types of specimens were prepared: Mg alloy specimens subjected to ultrasonic peening to generate compressive stress and stainless steel specimens subjected to bending to generate tensile and compressive stresses.
3：List of Experimental Equipment and Materials:
LIBS setup (RT100; Applied Spectra) with an Nd: YAG laser (wavelength: 1064 nm; energy: 80 mJ per pulse; pulse width: 5 ns), five-channel CCD camera, motion stage for specimen transport, and Aurora software for spectral line analysis.
4：Experimental Procedures and Operational Workflow:
Surface treatments were performed on Mg alloy specimens through ultrasonic peening. Stainless steel specimens were subjected to bending. Stress measurements were conducted using LIBS and XRD. The LIBS measurements involved laser ablation to create micro-holes for internal stress analysis.
5：Data Analysis Methods:
The spectral line signals from LIBS were analyzed to determine the ratio of ionic to atomic spectral line intensity, which was correlated with stress levels. XRD measurements provided reference stress values for comparison.
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