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 16 of 16 for “"Drop-Weight Impact"”.
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Design, fabrication, and calibration of an instrumented drop weight impact tester
… fabrication, and calibration of an instrumented drop weight impact tester is described. Included in this description are all the sketches and drawings that are needed to duplicate this project, if so desired. This impact tester was built for around $23,000 less than it would have cost to buy and …
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An investigation into the impact fracture behaviour of poly (propylene-ethylene) copolymers using an instrumented low temperature drop weight impact tester
This dissertation examines the drop weight impact behaviour and fracture of poly (propylene - ethylene) copolymers at cryogenic temperatures. A cryogenic temperature facility was incorporated into the existing instrumented drop weight impact tester to allow for variation of the impact test …
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Impact resistance of filled concrete box sections
… of this research is to analyze the effects of drop-weight impact tests on filled concrete box sections. Research in other areas of soil filled container walls has proved favorable in blast loading environments suggesting a concrete system may also work well. In the experiment, thirty different …
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Nanoindentation of copper covetics and the mechanical testing and microstructural imaging of additive manufactured Inconel 718
… as cast and have compositions of 0, 3, 5, and 9 weight percent activated carbon. Additionally, this study investigates the mechanical properties of some W-series copper-carbon composites. Four different compositions were compared: 0.83 weight percent activated carbon, 2 weight percent activated …
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Dynamic response of glass under low-velocity impact and high strain-rate compression loading
… Silica were characterized using a Dynatup 8250 drop weight impact test system, and a modified 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 …
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The effects of tensile preloads on the impact response of carbon/epoxy laminates
Low velocity drop weight impact tests were conducted on carbon/epoxy laminates under various magnitudes of uniform tensile stress. The composite plates were 8 ply (+45,0,- 45,90)<sub>s</sub> laminates supported in a clamped-clamped/free-free configuration. Tensile preloads from near zero to …
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Numerical analyses of long carbon fiber reinforced concrete panels exposed to dynamic loading
<p>"The purpose of this research was to evaluate impact and blast performance of long carbon fiber reinforced concrete experimentally and numerically. Experimental tests were conducted on plain concrete (PC), reinforced concrete, and four different types of long carbon fiber reinforced concrete …
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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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Static and Dynamic Characterisation of Flax Fibre-reinforced Polypropylene Composites
… using various mechanical (tensile, flexural and impact (Charpy impact and drop weight impact)) and dynamic (dynamic mechanical analysis (DMA) and impact hammer technique (IHT)) analyses, respectively. The mechanical properties of the composites are strongly affected by fibre orientation with …
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Effect Of Impact Damage On Compression-Compression Fatigue Behavior Of Sandwich Composites
… research work was to investigate the effect of impact damage on in-plane buckling and compression-compression fatigue behavior for a new sandwich structure made from E-glass/epoxy face sheets over end-grain balsa wood core. Low velocity impact tests were carried out using a drop-weight impact …
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Fracture properties analysis of rotationally moulded plastics for their application in skin-foam-skin sandwich structure
… exhibits relatively high stiffness, strength-to-weight ratios and is used increasingly in various applications such as automotive and marine. During the lifetime of the sandwich material, it may face multiple or repeated impact events. Therefore, the aim of this work is to develop a better …
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Behaviour of ultra high performance fibre reinforced concrete subjected to static and impact loads
… material with the potential of enhancing the impact energy absorption capacity of structural elements due to its superior properties. However, major limitations for its wider use and application in critical infrastructure and protection are associated with the limited studies, lack of design …
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Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… but are particularly susceptible to transverse impacts. Impact can significantly reduce strength and the extent of damage can grow under cyclic loading conditions. Because this type of damage often occurs below the surface, hidden from inspection, it is especially critical in structural …
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Assessment of a Shredding Technology of Waste Printed Circuit Boards in preparation for Ammonia-based Copper leaching
… local company as well as running tensile tests, drop weight impact tests and three-point bending tests on a batch of custom-made PCBs supplied by the local company. The metal liberation methods tested included the use of an industrial grab shredder to size reduce and delaminate the PCBs, use of a …
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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
<p>Impact strength is one of the most important structural properties for a designer to consider, but is often the most difficult to quantify or measure. A constant concern in the field of composites is the effect of foreign object impact damage because it is often undetectable by visual …
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Impact Resistance of Hybrid Metal-Organic Frameworks/Carbon Fibers Composites
… In this study, the energy absorption due to impact at low speed will be tested and simulated in four configurations of CFRPs utilizing the same [0/90]<sub>S</sub> layout throughout them.</p> <p>The carbon fiber configurations used during this study are de-sized, acid-activated, metal-organic …