研究目的
To develop a non-contact, non-destructive remote strain sensing technique based on laser speckle imaging to study the anisotropic deformation around circular notched specimens.
研究成果
The study successfully developed a non-contact, non-destructive remote strain sensing technique based on laser speckle imaging. The LSIS demonstrated the capability to monitor the evolution of anisotropic deformation around fastener holes, showing remarkable agreement with FE predictions. This demonstrates the potential application of LSIS as an effective NDT technique for full-field, non-contact, and remote sensing of anisotropic deformation.
研究不足
The study acknowledges the adverse decorrelation effects of laser speckle patterns under applied loads, which have limited the use of LSIS in practical applications. The research also highlights the need for optimizing laser speckle patterns before image correlation to obtain robust and accurate measurements.
1：Experimental Design and Method Selection:
The study involved the development of a laser speckle imaging system (LSIS) for non-contact, non-destructive, and remote strain sensing. Methods for determining optimal laser speckle patterns were investigated to achieve remote sensing of strain up to a working distance of 5 m.
2：Sample Selection and Data Sources:
The LSIS was applied to study the anisotropic properties of un-notched and circular notched specimens in cold-rolled aluminium sheet.
3：List of Experimental Equipment and Materials:
The LSIS included a laser diode, beam expander, apodizing filter, CCD camera, and other optical components.
4：Experimental Procedures and Operational Workflow:
The LSIS was validated with the performance of an extensometer in a uniaxial tensile test and then applied to investigate the anisotropic deformation around fastener holes subjected to tensile loads.
5：Data Analysis Methods:
The measured longitudinal strain was compared with FE simulations using a phenomenological constitutive model.
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