Abstract
The present paper deals with an effort to model impact damage in 3D-FE simulation. In this work, we studied the scattering behavior of an incident A0 guided wave mode propagating towards an impacted damaged zone created within a quasi-isotropic composite plate. Besides, barely visible impact damage of the desired energy was created and imaged using ultrasonic bulk waves in order to measure the size of the damage. The 3D-FE frequency domain model is then used to simulate the scattering of an incident guided wave at a frequency below an A1 cut-off with a wavelength comparable to the size of the damaged zone. The damage inside the plate is modeled as a conical-shaped geometry with decayed elastic stiffness properties. The model was first validated by comparing the directivity of the scattered fields for the A0 Lamb mode predicted numerically with the experimental measurements. The modeling of the impact zone with conical-shape geometry showed that the scattering directivity of the displacement field depends significantly on the size (depth and width) of the conical damage created during the point-impact of the composite with potential applications allowing the determination of the geometric characteristics of the impacted areas.
Highlights
There is a rapid increase in the use of carbon-fiber-reinforced composite materials in the aerospace industry over the last decade [1,2]
It is well known that mechanical properties of composite materials can be severely degraded by the initiation and propagation of structural damages, which may appear during the components’ life cycles [1]
Since impacts can locally cause crack-like defects, they may lead to local decays in material properties, i.e., in the vicinity of the impacted zone [1,3,4,5]
Summary
There is a rapid increase in the use of carbon-fiber-reinforced composite materials in the aerospace industry over the last decade [1,2]. The scattering of guided waves in the case of an impact damage is different from the one corresponding to a delamination created along the full width of the composite laminates. This work investigates the directivity pattern of the scattered field of incident A0 guided wave by the impact damage and provide much more material and a more indepth study in connection with new experimental results to our previous contribution [33]. The three-dimensional (3D) characteristics of the damage zone are presented and used in a 3D frequency domain finite element model [34] to simulate the scattering phenomenon of fundamental incident A0 Lamb mode sent towards the damaged zone The latter has been modeled as a right, circular, conicalshaped geometry with decayed material stiffness properties. The numerical finiteelement-based-scattering characteristics is discussed for different geometrical parameters with a view towards modeling impact damage using conical-shape geometry with decay material properties
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