为了定量研究红外无损检测中缺陷深度和形状的问题,首先对带有内部缺陷的平板试件建立了热传导的物理和数学模型,并对不同深度缺陷的情况进行了仿真分析和理论计算,得出了缺陷深度的理论计算方法;然后在已知缺陷深度的情况下利用ANSYS对内部具有不规则缺陷的试件进行了仿真试验,并采用共轭梯度法来定量计算内部缺陷的形状.研究结果表明,该研究为红外无损检测的定量研究提供了理论依据.%In order to study the problem of defect depth and shape of infrared nondestructive testing, firstly, heat transfer physical and mathematical model of flat specimens with internal defects was established, simulation analysis and theoretical calculation at different defect depth was carried out, and theoretical calculation methods of defect depth were obtained.Then, simulation experiment on test piece with internal irregular defects was made by applying software of ANSYS under the condition of certain defect depth, quantitative calculation of internal defects in shape was adopted by using conjugate gradient method.Research results show that this research provides theoretical basis for the quantitative study of infrared nondestructive testing.
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