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 388 for “"Fracture Toughness"”.
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The Fracture Toughness of Fibre Concretes
… and numerical results on the application of Fracture Mechanics to concrete materials. In the experimental work, a study of the general properties of plain and fibre-reinforced concrete has been carried out with particular emphasis on Mode II as well as Model failure. A numerical study of the …
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Bone fracture toughness of estrogen deficient rabbits
Bone mass is commonly used as an indicator of fracture risk. It has been shown in numerous studies that bone loss causes increased bone fragility and risk of fracture. It has also been shown that 50% of patients with osteoporotic vertebral compression fractures have the same bone mass as normal age …
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Fracture toughness of ultra high performance concrete
In this study, fracture properties of Ultra-High Performance Concrete (UHPC), and High Performance Concrete (HPC) are presented. The average compressive strengths of UHPC and HPC used in the tests were 141 MPa, and 55 MPa respectively. Formulation and processing of the mixes and test specimens are …
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The fracture toughness of ultrafine WC-Co Alloys
This thesis examines the fracture toughness behaviour of a series of cemented carbides having carbide grain sizes between 0.35f.Lm and 4f.Lm, cobalt contents ranging from 6 to 15wt%, and vanadium carbide contents from 0 to 0.8wt%. A series of twenty-four ultrafine WC-Co alloys were sintered from …
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Rheological measures of the fracture toughness of hydrogels
… issue, a method is proposed to determine the fracture toughness of a notched hydrogel using rheology, as opposed to tensile tests. Notched polyacrylamide hydrogels underwent constant strain rate tests on a rheometer to fracture the samples. Tensile tests were performed on notched samples as a …
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High fracture toughness and high modules silicone resins
… compromise modulus and other properties. High fracture toughness and modulus addition cure rigid silicone resins are obtained in this study by a combination of intrinsic toughening and extrinsic toughening techniques. The addition cure silicone resin comprises two components: …
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The Interplay Between Bone Homeostasis, Permeability, and Fracture Toughness
… leading to reduced bone quality and increased fracture risk.</p> <p>Understanding how these factors interact is critical, especially in pathological contexts where bone fragility increases. This dissertation explores how bone homeostasis, permeability, and fracture toughness are linked through …
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Plane strain fracture toughness testing of hollow aluminum bars
… to using round bars for plane strain fracture toughness testing. Specifically these are: (1) a large amount of material is required, for specimen fabrication, (2) a testing machine of great capacity is needed to fail such specimens, (3) there is considerable difficulty and expense …
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Synthesis and fracture toughness of macro-defect-free (MDF) cement
… there are few reports on the study of the fracture toughness of MDF. A common test, the two-parameter fracture method, based on the simple premise that a change in specimen compliance can be correlated to the length of the effective crack at the time the critical (i.e., peak) load is …
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Fracture toughness enhancement and synthesis of ZrO2 bearing ceramic alloys
Thesis (Sc.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1982.
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Hull girder ultimate strength and fracture toughness of damaged marine structures
… moments for intact and damaged conditions, where fracture mechanics of ships with large damage openings are investigated in great detail. The motivation for conducting this research task is the importance of the ultimate and post-ultimate strength in relation to the reliability of intact as well …
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Mode I Fracture Toughness Testing of Friction Stir Processed HSLA-65
… in Naval construction, mode one elastic-plastic fracture toughness of friction stir processed HSLA-65 was determined using current ASTM 1820 and BS 7448 standards. Double-sided welds were used to achieve 12.7 mm thick samples. A constant feed rate of 100 mm/min was used for all welds. To explore …
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Relationship Between Tensile Properties and Microscopically Ductile Plane Strain Fracture Toughness
Made available in DSpace on 2014-12-12T00:25:54Z (GMT). No. of bitstreams: 1 7405684.pdf: 4740009 bytes, checksum: 7b8008bfb0c0cca00c53833478b5d7b3 (MD5) Previous issue date: 1973
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Microcracking Fracture Toughness for Graphite Epoxy Composite Laminates Using Finite Fracture Mechanics
… was undertaken to determine the microcracking fracture toughness in composite laminates using the energy release rate criteria. Three materials of specific interest in the aerospace industry – IM7/977-2, IM7/5555 and IM7/5276-1 – were analyzed. To evaluate the microcracking fracture toughness, …
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The fracture toughness of silica fume concrete using experimental and numerical techniques
… were employed to investigate the mechanical and fracture characteristics of CSF concrete wet cured at 20° C and 50° C.<br/>Whereas the high temperature curing resulted in increased compressive strength at early age, the specimens cured at 20° C exhibited higher strengths beyond 28 days. It was …
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Impact of stability and surface area on fracture toughness of biological structures
… is subsequently used to characterize the fracture resistance of bone-inspired structures. Specifically, this thesis is divided into two major themes of work: Theme 1: Multigrid methods for large-scale topology optimization with application to trabecular bone-inspired structures: We …
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Scratch tests : a new way of evaluating the fracture toughness of materials
This thesis develops, validates and implements a fracture mechanics model for the assessment of the fracture toughness of materials from scratch tests. Dimensional Analysis highlights two major processes at work during scratch tests: plastic yielding and fracture dissipation. An original set-up of …
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