| Fiber reinforced composite has been a fast developing material with its advantages such as highspecific stiffness and strength and improved fatigue and anti-corrosion properties. Recently, fiberreinforced composite materials are widely used in telecommunication, building, aviation and marineengineering fields. Composites are commonly used in structural parts such as hull panels,superstructure, propellers and so on. Utilizing composites in marine engineering fields has been a hottopic as its broad application prospects. However, laminated composites usually have poor resistanceto impact loading, accompanied by the risk of failure from damage.It is highly significant to understand the mechanical behaviours of laminated composites,especially under the potential impact loading during fabrication, operation and repair process. Firstly,the constitutive characteristics of composites are discussed via mesomechanics concepts, the strengthand the debonding evolution of the fiber-matrix interface are analyzed by the cohesive elementsmethod and transverse behavior of marine composites under different strain rates is also investigated.Secondly, the impact responses of typical laminates are investigated numerically in this research.Damage resistance of a laminate is highly dependent upon several factors including geometry,thickness, stiffness, mass, and impact energies (impact velocities). Delamination responses amongplies and fibre and/or matrix damage responses within plies are simulated to understand thebehaviours of laminates under different impaction conditions. Finally, a protective device FE modelis built to study the mechanism of ship impacting bridge pier. After that, three optimum proposals areproposed to improve the anticollision property of current protective device. |
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