Inverse Problems in Science and Engineering | 2019
Determination of layerwise material properties of composite plates using mixed numerical–experimental technique
Abstract
ABSTRACT The global material properties and boundary conditions of Fibre Reinforced Plastics (FRP) plates can change substantially from their initial values after prolonged use. Since composite plates use different materials in different layers, a method for determination of layerwise material parameters can be useful for structural health monitoring. Vibration responses being sensitive to material properties, an inverse material identification methodology using experimental modal testing and finite element model updating can be a reasonable option. Most of the existing inverse techniques are limited to the determination of average homogenized material constants only. The current two-staged technique, supplemented by information from specially fabricated ‘Characteristic plates’ having material properties same as those of the ‘Actual plate’ but different stacking sequences, is proposed as an effective solution. Modal testing has been conducted on a rectangular FRP plate under various boundary conditions and the difficulties associated with the implementation of such technique have been critically judged.