Global ETD Search
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 21 for “"Ballistic Impact"”.
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Lagrangian methods for ballistic impact simulations/
… various Lagrangian methods for simulating ballistic impact with the ultimate goal of finding a universal, robust and scalable computational framework to assist in the design of armor systems. An overview is provided of existing Lagrangian strategies including particle methods, meshless …
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Ballistic impact resistance of fiber-reinforced high density polyethylene
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1980.
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Effect of crosslinking on aramid composites and ballistic impact resistance
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1986.
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Finite Element Modeling of Ballistic Impact on a Glass Fiber Composite Armor
<p>Finite Element Modeling of Ballistic Impact on a Glass Fiber Composite Armor</p> <p>Dan Davis</p> <p>Experiments measuring the ballistic performance of a commercially available fiberglass armor plate were used to guide the development of constitutive laws for a finite element model of the …
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Time-resolved spectroscopic characterization of ballistic impact events in polymer and nanocomposite materials
… understanding of how materials respond to ballistic shock-loading is critical for the design and development of new protective materials. However, the nonlinear viscoelastic deformation present in polymers and nanocomposites during and immediately following a ballistic impact event is not …
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Ballistic Impact Resistance of Graphite Epoxy Composites With Shape Memory Alloy and Extended Chain Polyethylene Spectra™ Hybrid Components
… lack effective mechanisms for absorbing local impact energy often resulting in penetration and a structural strength reduction. The effect of adding small amounts of two types of high strain hybrid components on the impact resistance of graphite epoxy composites subjected to projectiles …
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Multi-material Adhesive Bonded Joints Under Static And Dynamic Loading
… static and dynamic loading conditions, such as ballistic impact. Despite their promise, the failure mechanisms of adhesives under such high-strain-rate scenarios remain insufficiently understood.</p> <p>This dissertation investigates the performance of adhesively bonded multi-material joints …
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Experimental and numerical study on the effect of strain rate to ductile damage
… applications such as automotive accidents and ballistic impact operate in the dynamic range. Thus the aims of this thesis were to develop a system to test the damage properties of materials at both quasistatic (≈ 1 s-¹) and dynamic (> 1 x 10³s-¹) strain rates, and then to determine the …
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Extraction of mechanical properties over a range of strain rates from indentation data
… plasticity in bulk metallic materials. Ballistic impact (indentation) of hard spherical projectiles was used to study a rigidly held target, with operative strain rates of the order 105 s-1. Input for the FEM model includes data characterizing the (temperature-dependent) quasi-static …
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Ergonomics, design and reliability of body armour
… considered. The problem of accurately measuring impact loads to the head is investigated and a rigid instrumented head form is demonstrated. This work showed that the filtering techniques derived from crash tests used in the current helmet standards are not applicable to ballistic impact events. …
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Accelerated computational modeling of ballistic helmet test protocols
… their threat mitigation performance. During ballistic testing, current combat helmet test protocols use clay to record the helmet backface deformation signature, which is used as an important criterion to measure the helmet effectiveness at preventing head injury. However, according to a …
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A critical investigation of the use of infrared thermography in determining the condition of composite materials
… of the work presented a parametric low-energy impact study where laminates were subject to modified Charpy and ballistic testing to create barely visible impact damage (BVID). The damaged parts were then subjected to inspection using techniques such as pulsed thermography, thermoelastic stress …
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Micromechanics of ultra-high molecular weight polyethylene fibre composites
… state-of-the-art materials for penetration and ballistic impact protection applications. The composites are made of strong UHMWPE fibres with a soft compliant matrix. The extreme anisotropy caused by the mismatch between the stiffness and strength of the fibres and the matrix resulted in unique …
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Experimental and numerical study on the effect of strain rate to ductile damage
… applications such as automotive accidents and ballistic impact operate in the dynamic range. Thus the aims of this thesis were to develop a system to test the damage properties of materials at both quasistatic (≈ 1 s−1 ) and dynamic (> 1×103 s −1 ) strain rates, and then to determine the …
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Computational Modeling and Impact Analysis of Textile Composite Structutres
… weakened by cracks and subjected to static-, impact- and ballistic-type loads. As more complicated modeling about textile composite structures is introduced, some of homogenization schemes, geometrical modeling and crack propagations become more difficult problems to solve. To overcome these …
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Experimental and numerical analysis of nano-enhanced polymer coated steel plates subjected to ballistic loading
… Railcars and Stationary Tanks Against High Power Impact. This research investigated several nano-enhanced polymers for their suitability in high-speed impact protection applications. The polymers were tested mechanically to find ideal nano-particle additive percentages then coated onto steel …
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Next Generation Multifunctional Composites for Impact, Vibration and Electromagnetic Radiation Hazard Mitigation
… mechanical (i.e., quasi-static, vibration, and impact) and electrical properties of FRPs while retaining minimal weight is the subject of many ongoing studies. The primary objective of this dissertation is to investigate the fundamental processes for developing hybrid, multifunctional composites …
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Impact damage behaviour of lightweight materials
Impact damage resistance is an essential requirement of lightweight structural components for high-performance applications. The aim of this thesis is to study the impact damage and perforation behaviour of lightweight materials including thin aluminium alloy plates and carbon fibre reinforced …
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