Abstract
This paper investigates the propagation of guided ultrasonic waves and the interaction with impact damage in composite plates using a full three-dimensional Finite Element analysis. Impact damage in the composite plate was modeled as rectangular- and T-shaped delaminations. In order to provide guidelines for extending the modeling of realistic multimode impact damage, the impact damage was modeled as a combination of the delamination and reduced materials properties. The information obtained from these methods was compared to the experimental results around the damage area for a validation. There was a reasonable similarity between the experimental and FE results. The FE simulations can effectively model the scattering characteristics of the A0 mode wave propagation in anisotropic composite plates. This suggests that the simplified and easy-to-implement FE model could be used to represent the complex impact damage in composite plates. This could be useful for the improvement of the FE modeling and performance of guided wave methods for the in-situ NDE of large composite structures.
Highlights
Composite materials offer an improved strength to weight capacity advantages which widely used in aerospace industry
The focus is to investigate the capability of Guided Ultrasonic Waves (GUW) to be used for monitoring a large composite structures
In order to study the practicality of the GUW on composites, the capability of the method is studied using Finite Element Modelling (FEM)
Summary
Composite materials offer an improved strength to weight capacity advantages which widely used in aerospace industry. The focus is to investigate the capability of Guided Ultrasonic Waves (GUW) to be used for monitoring a large composite structures. The potential for the impact damage in composites has been demonstrated, but the interaction of the guided waves with the complex and multi-mode impact damage requires improved understanding It is quite challenging for producing an accurate modelling of a real impact employing full 3D analysis [17]. Varieties of factors affect the propagation and scattering of guided waves in composite structures and could lead to inaccurate monitoring and defect detection results. This motivates the authors to study the interaction of guided waves with real impact damage in composite plate. This study could provide an insight for the NDE of composites
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