研究目的
To develop a method for estimating the depth of cracks in building materials using laser-induced thermography, enabling the distinction between shallow and deep fractures.
研究成果
The study presents a method for estimating the depth of cracks in building materials using laser-induced thermography and a β-tool. The method allows for the distinction between shallow and deep fractures, with potential applications in the diagnostics of railway bridges and other structures.
研究不足
The method assumes a two-dimensional geometry and requires knowledge of the material's physical characteristics (density, specific heat, and thermal conductivity). Uncertainties in these parameters can lead to systematic errors in the crack depth estimation.
1：Experimental Design and Method Selection:
The study employs laser-induced thermography to heat a small area on a side of a crack in building materials. The temperature distribution is analyzed to detect cracks and estimate their depth using a β-tool.
2：Sample Selection and Data Sources:
Selected specimens of brick and concrete with known cracks are used.
3：List of Experimental Equipment and Materials:
A pulsed laser working at wavelengths 532 nm and 1064 nm, with an average energy of about 40 mJ per pulse, and a thermo-camera FLIR T1020 equipped with a standard lens.
4：Experimental Procedures and Operational Workflow:
The laser heats a small area on the specimen, and the temperature distribution is captured by the thermo-camera. The data is transformed from 3D to 2D, and a 2D finite-element model is developed to compute the β-curve.
5：Data Analysis Methods:
The temperature gap across the crack is used as an input to the β-tool to estimate the fracture depth.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
