title: The influence of temperature variations on ultrasonic guided waves in anisotropic CFRP plates.
abstract: 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.
authors: Ultrasonics and NDT group, University of Bristol, Bristol BS8 1TR, UK; QinetiQ plc, Farnborough GU14 0LX, UK.
authors: O
authors: O
authors: Putkis
authors: QinetiQ plc, Farnborough GU14 0LX, UK.
authors: R P
authors: RP
authors: Dalton
authors: Ultrasonics and NDT group, University of Bristol, Bristol BS8 1TR, UK.
authors: A J
authors: AJ
authors: Croxford
keywords: Anisotropic materials; Structural health monitoring; Subtraction; Temperature; Ultrasonic guided waves