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 87 for “"damage mechanisms"”.
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Machining-induced damage mechanisms in KDP crystals
… As a result, many basic issues related to the damage-free machining of KDP crystals are still unsolved. This thesis aims to reveal the machining-induced deformation mechanisms of KDP with the aid of molecular dynamics (MD) analyses. To this end, a reliable potential function will be established …
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Impact damage mechanisms in several laminated material systems
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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The vibro-acoustic modelling and analysis of damage mechanisms in paper
… monitoring technique for use in identifying the damage mechanisms present in paper associated with its production process. The microscopic structure of paper consists of a random mesh of paper fibres connected by hydrogen bonds. This implies the existence of the two damage mechanisms of interest, …
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Mechanical behavior and damage mechanisms of woven graphite-polyimide composite materials
… tested. Material properties were measured and damage development documented under monotonic tension, sustained incremental tension, and tension-tension fatigue loading. Damage evaluation techniques included stiffness monitoring, penetrant-enhanced X-ray radiography, laminate deply, and residual …
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Analysis of damage mechanisms in boronized TZM tiles from Alcator C-Mod fusion reactor operations
… of the reactor had experienced non-uniform damage as a result of plasma interactions. This damage was most pronounced in the tiles from the limiter and divertor, but also appeared in regions of the reactor that were not traditionally believed to experience high heat or particle fluxes. The …
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Fatigue damage mechanisms in fiber reinforced composite materials including the effect of cyclic loading frequency
… investigation seeking to characterize fatigue damage mechanisms in fiber reinforced composite materials, accounting for the effect of cyclic loading frequency, is presented. A many faceted approach to the investigation was utilized; which included well documented strain-controlled fatigue …
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A Keratin Biomaterial for Treatment Following Spinal Cord Hemisection Injury and Investigation of Secondary Damage Mechanisms
… There are many contributing factors to secondary damage, including the inflammatory response that follows SCI. Peripheral immune cells are able to infiltrate to the site of injury through the damaged blood-spinal cord barrier (BSB). It is well-established that macrophages play a major role in this …
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Characterization of damage mechanisms and behavior in two-dimensionally braided composites subjected to static and fatigue loading
… and fatigue loading conditions to determine damage mechanism types and progressions. The braided architectures consisted of straight axial fiber bundles, which were surrounded by braider fiber bundles oriented at ±a 0 with respect to the axial fiber bundles. Static tension and compression …
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Theoretical analysis and experimental investigation of contact fatigue and surface damage in prealloyed and diffusion bonded sintered steels
The contact fatigue and surface damage of prealloyed (Fe-0.85Mo, Fe-1.5Mo) and diffusion bonded (Ni-free, low-Ni, high-Ni) powder metallurgy (PM) steels were investigated. Materials subjected to contact stress fail due to the nucleation of subsurface cracks (contact fatigue cracks), nucleation of …
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X-ray Micro-Computed Tomography and Deep Learning Segmentation of Progressive Damage in Hierarchical Nanoengineered Carbon Fiber Composites
… anisotropy concomitantly give rise to complex damage mechanisms that lead to difficult-to-predict failure, limiting CFRP understanding. Progressive damage mechanisms in CFRPs generally encompasses a spectrum of modalities, interactions, and sequences across multiple scales, exhibiting broad …
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Multi-Class 3D Segmentation of Progressive Damage in Advanced Composites using Deep Learning
… anisotropy are also associated with complex damage mechanisms that make failure prediction highly challenging, limiting CFRP performance knowledge and more efficient utilization. Typical damage mechanisms contributing to progressive failure fall into three categories, each of them manifesting …
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Adsorption, encapsulated solute leakage and microflow of giant vesicles during anhydrobiotic preservation in trehalose solutions
… understanding of the fundamental cellular damage mechanisms. Although there have been many studies examining the thermodynamics of relevance to anhydrobiotic preservation, particularly with regard to lipid phase and the effect of carbohydrates thereupon, comparatively little attention has …
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Long term behavior of Arall laminates
… step towards the understanding of the fatigue damage mechanisms in Arall laminates, and the relationships between damage and stiffness change, remaining strength and life.
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Boundary Integral Method for Interfacial Potential Flows in Unbounded Axi-Symmetric Domains
While the objective is to explore alternative damage mechanisms due to ultrasound, the work is not restricted as such. Indeed, the work is concerned with surface tension driven singularities at fluid interface in general. Within this study, different regimes are found and the conditions which …
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Analytical Modeling of Multi-Fractured Horizontal Wells in Heterogeneous Unconventional Reservoirs
… penetrating fracture and various fracture damage mechanisms. In this thesis, three linear flow models have been developed to facilitate pressure and rate behavior analysis of shale, tight sand and unconventional reservoir with damaged fractures. These models are validated by comparing with …
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Projectile impact damage in filament wound CFRP tubes : effect of stacking sequence on projectile kinetic energy dissipation
… their ballistic limits and the significant damage mechanisms were then measured and their contribution to energy dissipation quantified. Instrumented drop tests were also performed in order to determine the normal laminate shear fracture energy release rate and energy dissipated by friction …
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Damage characterization and modeling of notched graphite/epoxy sandwich panels in compression
Damage tolerant design, which focuses on a structure's ability to perform in a damaged state, is widely used in the aerospace industry today. Although extensive research has been carried out in this area for notched composite laminates, a relatively small fraction has dealt with compressive loading …
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Investigation of post hydraulic fracturing well cleanup physics in the Cana Woodford shale
… problem. History matching can help reveal some mechanisms existent in the cleanup process. The Fracturing, Acidizing, Stimulation Technology (FAST) Consortium at Colorado School of Mines previously developed a numerical model for investigating the hydraulic fracturing process, cleanup, and …
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Application of acoustic emission sensing for the non-destructive evaluation of advanced composite materials
… a real-time, in-situ acoustic emission (AE) damage detection system has been developed, where the monitoring of AE activity emitted from within a carbon/epoxy composite material (CFRP) is achieved using an all-fibre Mach-Zehnder interferometric sensor. The basic Mach-Zehnder configuration was …
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Multiscale modeling of elastic moduli and strength of bone
… of this dissertation focuses on the study of damage and failure in bone. To that end, first, the dominant deformation and damage mechanisms of bone are identified at each level of hierarchy, and, next, appropriate models are proposed to capture those mechanisms. The modeling is performed in a …
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