Biocomposite materials are increasingly used in industrial transport structures (aerospace and automotive). They offer the ability to design complex parts, lightweight shapes that respond to high mechanical performance. Flax fibers are the most widely used because of their availability and mechanical properties, competitive to the properties of glass fibers. The detection of damage in these structures is essential to anticipate perilous consequences. Impacts induced damage is the most critical. The health control of a structure requires information about the severity and location of a damage through nondestructive methods. The aim of this study is to investigate vibratory behavior due to the impact on a biocomposite structure (flax/epoxy) to detect and evaluate the damage induced in noncontact method.
In this paper a Control Volume Finite Element Method for harmonic acoustic problems is presented. A dispersion analysis for control volume constructed on Q1 finite elements is compared to Galerkin FEM. The spatial convergence is also given in an eigenfrequency determination process for a cavity. The application for exterior acoustic problems is also studied by dividing the whole field into inner and outer domains using a fictitious boundary. A control volume formulation is used to compute the inner field of the truncated problem, and several approaches are combined to describe the outer field behavior on the outside of the fictitious boundary. The task of coupling is easily implemented through the balance of local flux through polygonal volumes. A two-dimensional configuration with a circular interface demonstrates the validity of this approach.
Natural fibers are increasingly used for polymer composite intending to minimize the environmental impact. Bio-composite materials are increasingly being used in industrial transport structures, including aerospace and automotive. Natural fiber reinforces composites with equivalent performances of glass fiber composites, have higher amount of fiber, resulting in less pollution and much lighter weight, which reduces the fuel consumption. Also, they offer the ability to design complex parts and high mechanical properties structures. Barely visible impact damage (BVID) represent a serious threat to the efficiency of bio-composite materials. In this paper, modal analysis was used to investigate and evaluate the impact-induced damage of flax/epoxy composite plates. The vibratory behavior is an indicator of the structural health monitoring of composite materials. Natural frequency, damping loss factors and displacement pattern, named mode shapes, are studied in order to detect damage and anticipate perilous consequences through time.
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