Interaction of Underwater Blasts and Submerged Structures

Abrate, Serge

doi:10.1007/978-94-007-5329-7_3

Cited by 8 publications

(5 citation statements)

References 154 publications

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“…Bending is the primary mode of initial damage in thin laminates while shear stress dominates the damage initiation in thick laminates. 36 Dent is caused due to bending under impact loading. This confirms initial damage of two-layer FFRP because of bending, while matrix cracks are the main reason for Hertzian failure in four- and six-layer composites.…”

Section: Results and Discussion Of Drop-weight Impact Testmentioning

confidence: 99%

Effect of thickness on the impact resistance of flax fibre-reinforced polymer

Wang

Chouw

Jayaraman

2016

Journal of Reinforced Plastics and Composites

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Impact properties of flax fibre-reinforced polymer composites were investigated using two different impact test methods, i.e. drop-weight test and Charpy test. The drop-weight impact tests were conducted with varying drop height. For the drop-weight tests, the perforation energy and the energy absorbed by a specimen are used to study the impact response of the flax fibre-reinforced polymer composite. In a series of Charpy tests, the energy absorbed per unit width of the specimen was investigated. Impact force and Hertzian force were analysed and were found to increase with composite thickness. The ductility index decreased as the composite thickness increased. The failure of flax fibre-reinforced polymer composites started as micro-cracks, progressed to larger cracks and perforation occurred at last. However, the damage to flax fibre-reinforced polymer composites differed with the thickness of the specimens.

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Section: Results and Discussion Of Drop-weight Impact Testmentioning

confidence: 99%

Effect of thickness on the impact resistance of flax fibre-reinforced polymer

Wang

Chouw

Jayaraman

2016

Journal of Reinforced Plastics and Composites

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“…where 3 is the through-thickness wave speed in the transverse direction. According to Abrate [38], 3 can be calculated as: At the FSI boundary OO′ ( = 0), the incident pressure is:…”

Section: Underwater Blast Loadingmentioning

confidence: 99%

Development of Analytical Formulae to Determine the Response of Submerged Composite Plates Subjected to Underwater Explosion

Sourne

Dorival

2020

Lecture Notes in Civil Engineering

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Closed-form analytical formulae are developed to analyze the bending response of submerged composite rectangular plates subjected to underwater explosions (UNDEX). These explosions are supposed to occur at a sufficiently large stand-off distance so that a uniformly distributed pressure pulse can be applied and the corresponding bubble effects can be ignored. The plate is considered in an air-backed condition. The derivation steps are divided into two main stages. In the first stage, the impulsive velocity due to the interaction of shock wave and structure is determined by using Taylor's fluid-structure interaction (FSI) formulation while supposing a negligible structural deformation. Transmission of shock waves through the thickness of the plate is considered by assuming the material under uniaxial strain. At the end of the first stage, cavitation is supposed to occur all over the plate. In the second stage, deformation of the plate will commence which is followed by the collapse of the cavitation zone. The corresponding mechanical response of the plate is determined by imposing a simply-supported boundary conditions and by applying Lagrangian Energy approach to derive the motion equation, taking into account the water inertial effects. The proposed method is then tested with isotropic (steel) and laminated composite (carbon-fiber/epoxy) plates to analyze for both impulsive velocity and UNDEX responses. The obtained analytical results are compared with those from non-linear finite element explicit code, LS-DYNA. Finally, the advantages and limitations of the present method are evaluated.

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“…These structures are often subjected to dynamic loads induced by impacts [1], explosions [2], or fluid-structure interactions [3] in the case of marine structures. The dynamic response of these structures is usually determined using one of the many beam, plate, or shell theories that are currently available.…”

Section: Introductionmentioning

confidence: 99%

Impulsive Response of Sandwich Structures

Abrate

2014

Procedia Engineering

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Most analyses of sandwich structures consider static loading or dynamic loading in which loads are applied slowly enough so that beam and plate theories are adequate in predicting the overall bending deformation. However, for impulsive loading generated by explosions or impacts, the early phase of the response is not captured by these structural theories as it involves wave propagation through the thickness. Significant damage can be introduced during this early phase.

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Interaction of Underwater Blasts and Submerged Structures

Cited by 8 publications

References 154 publications

Effect of thickness on the impact resistance of flax fibre-reinforced polymer

Effect of thickness on the impact resistance of flax fibre-reinforced polymer

Development of Analytical Formulae to Determine the Response of Submerged Composite Plates Subjected to Underwater Explosion

Impulsive Response of Sandwich Structures

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