The composite laminates with embedded acrylonitrile butadiene rubber （NBR） layer were fabricated by cocuring process. The embedded layers were perforated with a series of small holes to allow resin to flow through t...The composite laminates with embedded acrylonitrile butadiene rubber （NBR） layer were fabricated by cocuring process. The embedded layers were perforated with a series of small holes to allow resin to flow through the damping layer and completely couple the structure to improve bending stiffness and interlaminar shearing strength of these cocured composite laminates. The damping, bending stiffness and shearing strength of these composite laminates with different perforation diameters were investigated. The experimental results show that increasing the perforation diameter leads to significant decreases in damping and significant increase in bending stiffness up to an area ratio of 7.065%. The area ratio here is defined as the ratio of perforation area to the total damping area. Beyond the area ratio of 7.065%, increasing the diameter to an area ratio of 50.24% results in only a slight variation in damping and bending stiffness. Moreover, increasing the perforation diameter does not always increase the shearing strength of the embedded viscoelastic layer. The shearing strength of embedded viscoelastic layer increases only when the area ratio is greater than 19.625%; instead, it will decrease.展开更多
The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect...The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect of fluid and nonlinear action of waves onstructures, the VOF (Volume Of Fluid) method combined with the k-ε turbulence model was used tosimulate the interaction between waves and structures. Governing equations were solved with thefinite difference method. Through 2D experimental study in the wave flume, the empiricalrelationship between the reflection coefficient of perforated caissons and the main affectingfactors were obtained from the experimental data using the least square method. Also the correlationbetween the ratio of the total horizontal force acting on perforated caisson and the force actingon solid caisson and the main affecting factors were regressed from the experimental data.展开更多
基金supported from the Center for Composites Material and Structure of Harbin Institute of Technology,China
文摘The composite laminates with embedded acrylonitrile butadiene rubber （NBR） layer were fabricated by cocuring process. The embedded layers were perforated with a series of small holes to allow resin to flow through the damping layer and completely couple the structure to improve bending stiffness and interlaminar shearing strength of these cocured composite laminates. The damping, bending stiffness and shearing strength of these composite laminates with different perforation diameters were investigated. The experimental results show that increasing the perforation diameter leads to significant decreases in damping and significant increase in bending stiffness up to an area ratio of 7.065%. The area ratio here is defined as the ratio of perforation area to the total damping area. Beyond the area ratio of 7.065%, increasing the diameter to an area ratio of 50.24% results in only a slight variation in damping and bending stiffness. Moreover, increasing the perforation diameter does not always increase the shearing strength of the embedded viscoelastic layer. The shearing strength of embedded viscoelastic layer increases only when the area ratio is greater than 19.625%; instead, it will decrease.
文摘The reflection coefficient of perforated caissons and the total horizontalforces acting on them were experimentally and numerically analyzed and discussed when wavepropagates normally. To consider the viscosity effect of fluid and nonlinear action of waves onstructures, the VOF (Volume Of Fluid) method combined with the k-ε turbulence model was used tosimulate the interaction between waves and structures. Governing equations were solved with thefinite difference method. Through 2D experimental study in the wave flume, the empiricalrelationship between the reflection coefficient of perforated caissons and the main affectingfactors were obtained from the experimental data using the least square method. Also the correlationbetween the ratio of the total horizontal force acting on perforated caisson and the force actingon solid caisson and the main affecting factors were regressed from the experimental data.
