Abstract
Delamination Identification of Composites using Normalized Modal Curvature and Image Processing
Highlights
Laminated composites suppliant traditional metals in the marine, automotive, construction and aerospace industries in the present time
Numerical Results: Numerical modal analysis is performed on the eight-layer composite plate with stacking sequence [0/90/0/90]s using ANSYS -ACP(Pre) software for intact and delaminated plates with three delamination positions at the center, right and NE of 20x20 mm2 delamination area
There is a small deviation of the surface at the delamination location, but this deviation is dominated as a result of the global tendency of the modal curvature surface, so this singularity is not sufficient to identify the delamination positions of the composite plates
Summary
Abstract:- Delamination in FRP composites causes a considerable reduction in the transverse load carrying capacity, which is a major apprehension to the aerospace and automotive industries. Modal analysis based damage identification in the composite materials is usefully employed in structural health monitoring. Using normalized modal curvature the delamination location detection is discussed in this paper. For the intact and delaminated composite, numerical modal analysis is performed using ANSYS-ACP. Modal parameters (frequency and mode shape) are extracted from the simulated composite plate. Modal curvature at each node is calculated by double differentiation of mode shape deformation. Damage Index (DI) is formulated using the modal curvature of intact and delaminated composite plates. Analyzing DI at each node of the plate region delamination is identified. Damage Index based delamination identification validated with Image Processing technique. The proposed approaches successfully identify the delamination position and size of the composites
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