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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。
Taking the testing of internal debonding defects in the metal composite plate as the research object, a large-scale finite element analysis software ANSYS was used as a numerical simulation tool to systematically simulate the sample thickness effect in the non-destructive testing of the composite plate infrared thermal image. In order to reduce the workload of the simulation study, the sample is set as a round cake and the inner debonding defects in the composite steel plate are simulated with a circular cake shaped air gap coaxial with the sample. The three-dimensional prototype is simplified into a two-dimensional simulation model by using the axisymmetry of the model in terms of geometry, load, boundary conditions, etc. In order to quantitatively evaluate the detectability of defects, the indices of maximum defect temperature difference and defect appearance are defined , And their calculation methods and calculation formulas are also given.Given the variation rule of the maximum defect temperature difference and the flaw occurrence degree with the thickness of the composite material and the thickness of the substrate respectively, the conclusion of this paper is that the internal debonding infrared heat of the bimetal composite steel plate Like non-destructive testing has a certain significance.