Numerical simulation of defect inspection using electromagnetically stimulated thermography

The feasibility of electromagnetically stimulated thermography non-destructive testing (NDT) for the detection of defects in metallic conductive materials has been carried out by finite element analysis. Aluminum plates with defects of different diameters, depths, locations, shapes and orientation with respect to eddy current are numerically investigated. ANSYS software is used to solve the coupled electromagnetic and temperature field equations. The peak temperatures on the top surface of circular defects with different diameters and depths are calculated at varying excitation frequencies. It is demonstrated that the obtained temperature inreases with increase of the defect diameter and decrease of its depth. The dependence of the temperature over the top surface of the defect on its location and orientation is also presented. The results indicate that we can detect the subsurface defect and estimate its depth and location by choosing a suitable coil-specimen configuration.     

碾子坪特大桥大体积混凝土承台施工期水化热模拟与温度控制

结合厦蓉高速贵州境碾子坪特大桥主桥承台设计与施工,考虑了冷却水管的冷却水温、冷却水通水流量等参数,利用有限元软件Midas/Civil对承台大体积混凝土施工期水化热进行仿真计算,分析了水化热变化规律及温度分布规律,并与实际温度监测结果进行了对比分析,提出了合理的施工方案,据此指导现场温度控制。