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 30 for “"damage resistance"”.
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Buckling and damage resistance of transversely-loaded composite shells
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Impact Damage Resistance of Shape Memory Alloy Hybrid Composite Structures
The strain energy absorption of shape memory alloy (SMA) bars and beams under tension and bending loading was studied. A theoretical model is presented that can give quantitative relations between the martensite fraction, the applied load, and the strain energy absorbed in the shape memory alloy …
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Impact damage resistance and tolerance of advanced composite material systems
Experimental evaluations of impact damage resistance and residual compression strengths after impact are presented for nine laminated fiber reinforced composite material systems. The experiments employ a small scale specimen for assessing the impact damage resistance and impact damage tolerance of …
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Damage resistance and damage tolerance of thin composite facesheet honeycomb panels
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1989.
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Evaluation of Warm Mix Additives for Use in Modified Asphalt Mixtures: Phase I
… mixtures from Nevada and California: moisture damage, performance characteristics, and mechanistic analysis.In Phase I of this research effort, mixture resistance to moisture damage was evaluated using the indirect tensile test and the dynamic modulus at multiple freeze-thaw cycles. Laboratory …
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Processing of toughened cyanate ester matrix composites
… tests were performed to measure the impact damage resistance and shear properties of the toughened cyanate ester resin composites. The results show improvements in impact damage resistance compared with the commonly used hot-melt epoxy resin composites. The influence of processing on …
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A technical and economic analysis of structural composite use in automotive body-in-white applications
… promise increased design flexibility, improved damage resistance and lighter weight (among others) over the steel designs that are currently in production. To understand why such features are desirable and why a composite intensive vehicle may become an attractive platform for an automaker to …
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Autonomic healing of low-velocity impact damage in woven fiber-reinforced composites
… 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 applications. Traditionally, impact damage repair techniques have focused on …
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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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Indentation of plastically graded materials
… in plastic properties is known to promote resistance to the onset of damage at contact surfaces during some tribological applications. Gradients in composition, microstructure and plastic properties can also be deleterious to contact-damage resistance in some situations. In order to realize …
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Impact damage evaluation of high performance polymeric composite material systems
… is described. Evaluation methods for impact damage resistance and impact damage tolerance as developed by K. T. Teh are presented as a basis for comparative analysis of new materials. Experimental results are presented for six different laminated fiber reinforced composite material systems …
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Analysis of After Impact Characteristics and Structural Optimization of CFRP Composite Plate
… on composites may cause Barely Visible Impact Damage (BVID), which is one of the most common damage types and may result in a decrease in strength of the composite. The objectives of this research were (a) to identify the characteristics of a carbon/epoxy composite plate after low-velocity …
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Nanoindentation Techniques for the Evaluation of Silicon Nitride Thin Films
… subjected to nanoimpact testing to compare the damage resistance of the film to separate nanoimpact types. Samples were subjected to nanoscratch testing to evaluate the consistency of the critical load of the film. Results showed that there were no significant differences in the mechanical …
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Laboratory Evaluation of Warm Mix Asphalt Mixtures in South Dakota, USA
… suggests WMA may be more susceptible to moisture damage and rutting than traditional HMA mixtures.The objective of this research was to evaluate various types of WMA paving technologies relative to HMA mixtures to determine their suitability for use in South Dakota in various applications. This …
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Comprehensive Evaluation of Asphalt Mixtures in Arid Climatic conditions
… (Marshall and Superpave) exhibited excellent resistance to moisture damage and rutting. TSR test results showed that the Marshall asphalt mixture had higher dry and wet indirect tensile strength (TS) than the Superpave asphalt mixture. However, the TSR values were higher for the Superpave …
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Analysis of Fine Asphalt Concrete Mixture Gradations from Various Sources to Enhance Durability
… air void content and therefore higher moisture damage resistance. This is because the finer aggregates tend to fill the voids that were otherwise not filled by the coarse aggregates. This will lead to enhanced durability because less water and air can penetrate the mix, leading to less oxidation …
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Simultaneous structural/acoustical design of composite panels
… Structural analysis is based on a fatigue damage resistance criterion. Sequentially designed treated composite panels exibit transmission losses 15 dB - 45 dB higher (transmitted pressure is 6 - 180 times smaller) than a structurally equivalent, equal-mass aluminum panel. Depending on the …
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A theoretical approach to the prediction of haemolysis in centrifugal blood pumps
… strongly depends on the extent to which they damage blood. The development of a theoretical pump evaluation model was performed in this study to facilitate an effective pump optimisation. The optimisation process seeks to maximise flow performance and minimise blood trauma which is primarily …
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The Role of Bacteroides Conjugative Transposons in the Spread of Antibiotic Resistance Genes, And, The Role of recA in DNA Damage Repair in Deincoccus Radiodurans
… the horizontal transmission of antibiotic resistance genes in the environment. The data presented in this thesis shows that an open genetic conduit exists between gram positive bacteria that reside in the intestinal lining of cows and gram negative bacteria that reside in the human colon. …
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