Surface transient temperature inversion for hidden corrosion characterisation: theory and applications
Surface transient temperature inversion for hidden corrosion characterisation: theory and applications
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DOI：
10.1016/0017-9310(95)00126-t
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发表时间：
1996
影响因子：
5.2
通讯作者：
V. Vavilov;E. Grinzato;P. Bison;S. Marinetti;M. Bales
中科院分区：
文献类型：
--
作者：
V. Vavilov;E. Grinzato;P. Bison;S. Marinetti;M. Bales
金属中的腐蚀是用板厚度的变化来模拟的，板厚度在1D模型中是横向无限的，在2D模型中由铣削的平底孔来表示。腐蚀区域的温度对比度被选为信息参数，与红外热成像试验中吸收的热能完全无关。它示出，由于较低的灵敏度在热过程的开始和增加的3D热扩散效应在该过程的结束时的后侧效应，有一个最佳的时间来检测腐蚀。提出了一种鲁棒的反演函数，并利用数值模拟分析了其对被测材料、热脉冲持续时间和观测时间变化的稳定性。对1.3mm厚的钢试件进行了腐蚀实验研究，证明了该反演算法的有效性，材料损失范围为74 ~ 14%时，平均精度为17%。
Corrosion in metals is simulated with variations in plate thickness which are laterally infinite in a 1D model and are represented by milled flat-bottom holes in a 2D model. Temperature contrast over corroded areas is chosen as an informative parameter, quite independent of absorbed thermal energy in the infra-red thermographic test. It is shown that, due to lower sensitivity to rear-side effects at the beginning of the thermal process and increasing 3D heat diffusion effects at the end of the process, there is an optimum time to detect corrosion. A robust inversion function is proposed and its stability against variations in tested material, heat pulse duration and observation time is analysed using numerical modelling. Corrosion in a steel specimen of 1.3 mm thickness is experimentally studied, having proved the validity of the inversion algorithm with an average accuracy of 17% for material loss ranging from 74 to 14%.