Putkis O, Dalton R P, Croxford A J
Ultrasonics and NDT group, University of Bristol, Bristol BS8 1TR, UK; QinetiQ plc, Farnborough GU14 0LX, UK.
QinetiQ plc, Farnborough GU14 0LX, UK.
Ultrasonics. 2015 Jul;60:109-16. doi: 10.1016/j.ultras.2015.03.003. Epub 2015 Mar 13.
Carbon Fibre Reinforced Polymer (CFRP) materials are lightweight and corrosion-resistant and therefore are increasingly used in aerospace, automotive and construction industries. In Structural Health Monitoring (SHM) applications of CFRP materials, ultrasonic guided waves potentially offer large area inspection or inspection from a remote location. This paper addresses the effect of temperature variation on guided wave propagation in highly anisotropic CFRP materials. Temperature variations cause changes in guided wave velocity that can in turn compromise the baseline subtraction procedures employed by many SHM systems for damage detection. A simple model that describes the dependence of elastic properties of the CFRP plates on temperature is presented in this paper. The model can be used to predict anisotropic velocity changes and baseline subtraction performance under varying thermal conditions. The results produced by the model for unidirectional and 0/90 CFRP plates are compared with experimental measurements.
碳纤维增强聚合物（CFRP）材料重量轻且耐腐蚀，因此越来越多地应用于航空航天、汽车和建筑行业。在CFRP材料的结构健康监测（SHM）应用中，超声导波有可能实现大面积检测或远程检测。本文探讨了温度变化对高度各向异性CFRP材料中导波传播的影响。温度变化会导致导波速度发生变化，进而可能影响许多用于损伤检测的SHM系统所采用的基线减法程序。本文提出了一个简单的模型，该模型描述了CFRP板弹性特性对温度的依赖性。该模型可用于预测不同热条件下的各向异性速度变化和基线减法性能。将该模型针对单向和0/90 CFRP板产生的结果与实验测量结果进行了比较。
