涡流脉冲热像中金属疲劳裂纹检测条件优化方法

摘要

In order to explore the influence of different detection conditions on crack heating and its optimal selection, the influence of lift-off distance, incentive strength and time on crack heating is studied by control variable method.Then, based on the effect analysis of those detection conditions on crack hea-ting, a multiple nonlinear regression model is adopted to estimate the Probability Of Detection (POD).of cracks under specific detection conditions, and the optimal selection range of the detection conditions is determined.The optimization method of detection conditions proposed in this paper will provide theoretical direction for detection scheme in Eddy Current Pulsed Thermography (ECPT).%为了探究不同检测条件对裂纹生热特性的影响及其最优化的选择,采用控制变量法探究了提离距离、激励强度和激励时间等检测条件对裂纹区域生热的影响规律.基于检测条件对裂纹生热的影响分析,采用多元非线性回归模型估算了特定检测条件下裂纹检出概率(Probability Of Detection, POD),最终确定了检测条件的优化选择范围.上述检测条件的优化方法为涡流脉冲热像(Eddy Current Pulsed Thermography,ECPT)检测中检测方案的制定提供了理论指导.