复合钢板红外热像无损检测中的试样厚度效应

Thickness effect of samples on the non-destructive testing of composites steel plate by infrared thermography

以金属复合板中的内部脱粘缺陷检测为研究对象,采用大型有限元分析软件 ANSYS 为数值仿真工具,对复合钢板红外热像无损检测中的试样厚度效应进行了系统的数值仿真研究。为减少仿真研究的工作量,将试样设为圆饼状,并以与试样同轴的圆饼状空气间隙来模拟复合钢板中内部脱粘缺陷。利用模型在几何形状、载荷、边界条件等方面所具有的轴对称性,将三维原型简化为二维仿真模型.为定量评价缺陷的可检出性,定义了最大缺陷温差、缺陷显现度等指标,并给出了它们的计算方法和计算公式.获得了最大缺陷温差和缺陷显现度分别随复材厚度和基材厚度的变化规律,本文的研究结论对双金属复合钢板内部脱粘的红外热像无损检测具有一定的指导意义。

Aim to the non-destructive detection of debonding in composites steel plate(CSP)by Infrared thermography,Finite Element Analysis(FEA)software ANSYS is taken as the simulative tool,2D simulative model has been set up to study the effect of coating thickness and matrix thickness on detection systemically.In order to evaluate the detectivity of defects,the maximum defect temperature difference(MDTD or △T_(Dmax))and defect appearing index(DAI or I_D)are defined,and their computational methods and formulas are given respectively.The changing curves of △T_(Dmax)and ID with the thickness of coating and matrix are got respectively.The results of this paper can be taken as guideline to the non-destructive testing of debonding in CSP by infrared therrnography.