![]() Generally, impact damage occurs during in-service applications or as a result of handling during manufacturing. Indeed, the impact generates a shock wave whose mechanical energy propagates deep inside the material, thus causing different types of damage along its path. The problem with impact damage is that it may not be visible from the surface of the material, and even so, small scratches at the surface may hide severe damages underneath the impacted surface. Impact damage is considered to be a serious damage mechanism in composite structures, which limits performance and reliability for further use. This makes composite structures very vulnerable to impact damage and must therefore satisfy certification procedures for high-velocity impact from runway debris or bird strike. However, the main drawback of carbon fiber/epoxy is that these are inherently brittle and usually exhibit a linear elastic response up to failure with little or no plasticity. In present time, commercial aircraft contain such composites for primary and secondary wing and fuselage components. The main advantage includes low weight, high static and fatigue strength, and the possibility to manufacture large integral shell structures. There is a rapid increase in the use of carbon-fiber-reinforced composite materials in the aerospace industry over the last decade. 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. The model was first validated by comparing the directivity of the scattered fields for the A 0 Lamb mode predicted numerically with the experimental measurements. ![]() The damage inside the plate is modeled as a conical-shaped geometry with decayed elastic stiffness properties. The 3D-FE frequency domain model is then used to simulate the scattering of an incident guided wave at a frequency below an A 1 cut-off with a wavelength comparable to the size of the damaged zone. 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. In this work, we studied the scattering behavior of an incident A 0 guided wave mode propagating towards an impacted damaged zone created within a quasi-isotropic composite plate. The present paper deals with an effort to model impact damage in 3D-FE simulation. ![]()
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