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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 201 for “"Low-velocity"”.
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Simulation of low-velocity impact damage in sandwich composites
… mechanisms of sandwich composites subjected to low-velocity impact; various failure modes typically observed in composites including delaminations, fibre fracture and matrix cracking were simulated and implemented into ABAQUS/Explicit through user-defined subroutines VUMAT. Numerical simulations …
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Low-Velocity Impact to High-Temperature Low-Sag Overhead Conductors
<p>High-Temperature Low-Sag (HTLS) conductors, such as Aluminum Conductor Composite Core (ACCC), improve infrastructure to support the delivery of power to meet the nation's increasing demand for electricity. Their response to low-velocity impacts during transportation, installation or in service, …
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The design, construction and calibration of a low velocity anemometer calibrator
Digitized by Kansas Correctional Industries
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Low-velocity Impact Analysis of Composite Repair Patches of Different Shapes
… repaired by the use of composite materials. Low velocity impact can cause barely visible damage to the interior structure of laminated composite. These impacts can cause delamination in composite materials. In this study, a Finite Element Analysis was conducted using Abaqus/Explicit and the …
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A laboratory simulation of low velocity projectile impact on thin plates
… material response to projectile impact events. A low velocity apparatus, based on the conventional instrumented drop tower apparatus, was designed and constructed. The apparatus is instrumented in order that the penetration resistance force history and impact velocity can be measured by a data …
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Computational Design of Transparent Polymeric Laminates subjected to Low-velocity Impact
Transparent laminates are widely used for body armor, goggles, windows and windshields. Improved understanding of their deformations under impact loading and of energy dissipation mechanisms is needed for minimizing their weight. This requires verified and robust computational algorithms and …
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Effect of off-fault low-velocity elastic inclusions on supershear rupture dynamics
The velocity structure in the lithosphere is generally heterogeneous. Wave reflection, transmission, and diffraction from the boundaries of the different layers and inclusions are expected to affect rupture propagation on faults embedded in these heterogeneous structures. Here,a model of dynamic …
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Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… Because this type of damage often occurs below the surface, hidden from inspection, it is especially critical in structural applications. Traditionally, impact damage repair techniques have focused on increased factors of safety or use of toughened polymer matrices. In this work, a …
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Finite element analysis of permanent indentation of solids due to low velocity impact
A finite element model for the seventy five ton multi-barrier multi-purpose canister (MPC) Overpack is developed. This model is subjected to an impact loading that produces plastic stresses. The finite element software COSMOS/M 1.7 is used to study the nonlinear behavior of the canister overpack. A …
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Residual Compressive Strength Prediction of Carbon/Epoxy Laminates Subjected to Low Velocity Impact Damage
<p>Low energy impact damage to a composite structure is difficult to detect and can have profound effects on compressive strengths. Low energy impact damage is sometimes termed as barely visible impact damage (BVID). Detecting BVID is only possible by implementing nondestructive testing (NDT) …
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Dynamic response of glass under low-velocity impact and high strain-rate compression loading
… Split Hopkinson Pressure Bar (SHPB). In the low-velocity punch-shear experiment, similar trend has been observed for all glass types, and Starphire and Borosilicate demonstrated the highest total energy absorption. High strain-rate SHPB compression tests were carried out on cylindrical glass …
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Low velocity impact response of rc beam with artificial polyethylene aggregate as concrete block infill
In structural design, an ideal situation for saving materials would be to reduce the weight of the structure without having to compromise on its strength and serviceability. A new lightweight composite reinforced concrete section was developed with a novel use of a lightweight concrete block as …
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Identification and Distribution Analysis of the Mid-phase in a Low-velocity Gas-solid Fluidized Bed
The intermediate phase in low-velocity gas-solid fluidized beds generally presents excellent gas-solid contact in the systems. However, no comprehensive understanding of this vital phase is available in the literature. Therefore, this study proposed a statistical method to identify this …
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Some issues concerning the dynamic response and damage of composite laminates subjected to low velocity impact
… on a few specific topics regarding the low velocity impact behaviour of laminated composites. These topics were chosen because of their significance as well as the relatively limited attention received so far by the scientific community. The first issue considered is the comparison …
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Improving Damage Tolerance of Composite Sandwich Structures Subjected to Low Velocity Impact Loading: Experimental and Numerical Analysis
… conventional composite facing skins exhibit low impact resistance in the transverse direction. Here, composite skin sandwich structures with three different impact resistant core materials were fabricated and tested both experimentally and numerically. Neat CFRP and 2024-T3 aluminum alloy …
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Low velocity impact response of laminated textile coir-aramids/epoxy hybrid composites subjected to transverse penetration loading
… were conducted at the speed of 1.25 mm/s, and low velocity impact tests were conducted using a 12.7 mm hemispherical impactor at the speed varying from 5 m/s to 17 m/s. Matlab software was used for curve fitting of the raw data, whereas ANOVA and DOE via Minitab software were employed for …
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Shape Optimization of a Sandwich Composite Plate with Low-Velocity Impact Loading and Effect of Finite Difference Sensitivity Analysis
… the critical load cases in spacesuit design is a low-velocity impact (LVI) which may occur due to tool drop and other similar scenarios. The objectives of this work were (a) to create a finite element (FE) model of a component of a spacesuit, (b) validation of the FE model through experiments, (c) …
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A review of the Groote Schuur hospital experience of low-velocity non-missile penetrating orbital and transorbital stab wounds
… perform a retrospective review of all cases of low-velocity non-missile penetrating orbital trauma with intracranial complications presenting at Groote Schuur Hospital over the 5 year period between 1997 and 2001.
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Analytical behaviour of FRP strengthened reinforced concrete beams under low velocity impact load incorporating rate dependant material constitutive models
… of FRP strengthened RC beams subjected to low velocity impact events. Furthermore, many of the Finite Element (FE) analysis models developed in these studies yielded results that were inconsistent with the test data. Key shortcomings of these models relate to a lack of definition of the …
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The Effect of a Low-Velocity Impact on the Flexural Strength and Dynamic Response of Composite Sandwiches with Damage Arrestment Devices
… mechanical behavior of composite sandwiches, following a low-velocity impact. A 7.56-lb<sub>f</sub> crosshead dropped from a height of 37.5-inches was considered for the low-velocity impact testing. In this study, the experimental and numerical analysis of composite sandwiches were investigated, …
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