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 81 for “"Impact Energy"”.
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Development of a Finite Element Model for Predicting the Impact Energy Absorbing Performance of a Composite Structure
… (the chassis), which can resist large amounts of energy in the event of a crash, with an energy absorbing device at the front of the vehicle. The nose cone of the Cal Poly FSAE car is constructed as a carbon fiber shell designed to act as this sacrificial energy absorbing device. One difficulty …
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Contaminant removal from impervious pavements and its relationship with raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater pH
… removal from impervious pavements and raindrop impact energy, cumulative kinetic energy of rainfall events, and rainwater fit were evaluated. A commercial urban area was chosen to perform simulated rainfall experiments. The runoff from these experiments was collected and analyzed for total …
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The Effect of Impact Damage on the Fatigue Life of Steel
… of the research was to investigate the effect of impact damage on the fatigue life of steel using both experimental and finite element methods. Any component that is subjected to a single impact may have not only noticeable surface damage, but also residual stresses in its surface and subsurface …
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Impact response of interleaved composite materials
The need for better impact resistant composites has resulted in the development of many toughened resin systems. A combination of a tougher resin system along with higher strength fibers increases the impact resistance of the composite. The use of an adhesive layer between two plies of the improved …
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Fabrication and Compressive Behavior of Corrugated Aramid-Epoxy Cellular Solids
… solids can provide blast protection and absorb impact energy, but few perform well resisting blunt object (ballistic) penetration. In this thesis, a method is proposed for fabricating cellular solids from aramid-epoxy composites that can absorb impact energy and resist blunt object penetration. …
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Low-Energy Electron Impact Fragmentations of the Polycyclic Aromatic Hydrocarbon Anthracene
… the fragmentation processes induced by low-energy electron impact with anthracene. This research is relevant in the study of low-energy electron interactions with molecules in gaseous environments, including potentially in the interstellar medium where secondary electrons may be produced by …
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A Biomimic Self-healing Shape Memory Polymer Based Syntactic Foam for Smart Structural Composites
… applications was developed. The effect of impact energy on the ability for the 3-D fiber reinforced PSMP syntactic foam (PSMP-SF) panels to seal cracks and mitigate impact was investigated in terms of the number of impacts to complete perforation. It was found that by restoring surface …
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Study of Electron-Impact Induced Fragmentation of Thymine
… the fragmentation processes induced by low-energy electron impact. A molecular beam of thymine is generated by placing thymine in powder form inside a resistively heated oven. The beam of thymine is then crossed by a pulsed electron beam from an electron gun that consists of four …
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Designing, manufacturing, testing, and modeling motorcycle helmets using hybrid composite systems
… that are most often considered to absorb energy properly during a collision. Due to their extraordinary mechanical, electrical, and thermal properties and lightweight structure, they are widely used materials in various industries including defense, aerospace, automotive, sports, …
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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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FLOW FORMING OF CAPILLARY INTERFACES: DROP IMPACT AND THE MOBILE CONTACT LINE
Drop depositions are impacts where post impact the drop remains on the surface and its liquid/gas (LG) interface does not break apart. Our focus is on drop depositions in the capillary-ballistic regime. During drop impact, the falling drop’s pre-impact energy transforms into fast-time scale motion …
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Mechanical characterization of mammalian brain tissue and energy dissipative polymers
… of traumatic brain injury due to adverse impact events ranging from head collisions to ballistic attacks has prompted significant interest in synthetic polymer gels capable of mimicking key mechanical properties of brain tissue. These so-called brain tissue simulants are valuable tools for …
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Study of Low Energy Electron-Impact Induced Ionization and Fragmentation of Uracil
The aim of this experiment is to study low energy electron impact induced ionization and fragmentation of uracil. The apparatus consists of a pumped vacuum system with an expansion chamber, a collision chamber and a flight tube. A beam of uracil is generated in the expansion chamber, passes through …
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Impact failure modes of graphite epoxy composites with embedded superelastic nitinol
Energy absorption during complete penetration of thin graphite composites is experimentally shown to be significantly improved by low volume fractions of embedded superelastic shape memory alloy (SMA) fibers. Graphite/Bismaleimide laminates were embedded with 3% and 6% volume fractions of …
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Material impacts on operational energy usage
… those choices may affect the buildings ultimate energy usage and the impact they may have on climate change. This thesis focuses on concrete structures and how the thermal mass and the thermal resistivity influence energy usage. The investigation was done looking at large commercial office …
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Low velocity impact response of laminated textile coir-aramids/epoxy hybrid composites subjected to transverse penetration loading
… fibre has been found to have a high potential as impact resistance, in which brittle fibre helps to spread the impact energy over a wider area. The focus of the study is to determine if any improvement in impact response exists as a result of combining high performance Kevlar synthetic fibre and …
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Piezoelectric based energy harvesting on low frequency vibrations of civil infrastructures
Piezoelectric-based energy harvesting is an efficient way to convert ambient vibration energy into usable electric energy. The piezoelectric harvester can work as a sustainable and green power source for different electric devices such as sensors and implanted medical devices. However, its …
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Measurement and modeling of brain tissue and engineered polymer response to concentrated impact loading
… to reduce TBI include helmets designed to absorb impact energy, which are evaluated typically by simplified impact tests with engineered headforms equipped with brain tissue simulant materials and accelerometers.
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Delamination in fiberglass pre-impregnated laminated composites from ultrasonic a-scan signal using artificial intelligence
Impact-induced delamination (IID) in fiberglass pre-impregnated laminated composites (FGLC) is an important failure mode. Besides affected the material strength and structural reliability, this failure mode normally present minor damage on the surface but the internal damage may extensive. Existing …
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