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 18 of 18 for “"Fracture Mechanism"”.
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Adhesion of Dental Ceramic to Ti6Al4V Alloy Fabricated by CAD/CAM Technologies // Адхезия на дентална керамика към сплав Ti6Al4V, произведена чрез CAD/CAM технологии
… and bond) on the adhesion strength and the fracture mechanism of the porcelain coating was established. Sandblasting and combined treatment increase the adhesion strength of the porcelain to the milled samples but decrease it in the SLM ones. It has been confirmed that the failure of the …
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The effect of pre-strain on the fracture toughness of line pipe steel
… that it has a detrimental effect on the fracture toughness of steel. Pre-strain reduces the resistance to crack initiation and crack growth, and increases the transition temperature. Therefore, pre-strain will affect the response of the material to operational loads and its resistance to …
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Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites
… the aim of modelling its effect on the composite fracture damage for the purpose of long-term performance prediction. The composite was accelerated aged by hydrothermal ageing by immersing test specimens in distilled water at respective temperatures of 23oC, 40oC and 60oC for a maximum period of 6 …
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Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites
… the aim of modelling its effect on the composite fracture damage for the purpose of long-term performance prediction. The composite was accelerated aged by hydrothermal ageing by immersing test specimens in distilled water at respective temperatures of 23oC, 40oC and 60oC for a maximum period of 6 …
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A design protocol for failure resilient architected metamaterials
… assumed that a material property known as fracture toughness exists for these materials akin to usual continuum solids, without a-posteriori experimental validation. In fact, all existing experimental measurements are based on metamaterial specimens comprising only dozens to at most a few …
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Study of surface cracks in a simulated solid rocket propellant grain with an internal star perforation
… little is known concerning the three-dimensional fracture mechanism of the surface cracks which are the most common defects detected in the real rocket motor grain. After a brief evaluation of the current status of solid propellant research, stress analysis of a star grain model under internal …
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The effect of microstructure on the fracture toughness of a high strength steel
… between heat treatment, microstructure, fracture topography and room temperature fracture toughness has been determined for a high strength low-alloy steel, En 25. 0ptical, transmission and scanning electron microscopy were used to characterize the structure and morphology while fracture …
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Synthesis of Ti₂AlC, Ti₃AlC₂ and Ti₃SiC₂ MAX phase ceramics; and their composites with c-BN
… a composite with notable properties such as the fracture toughness, suggested by the observed fracture mechanism seen from the fracture surface of these composites.
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Edge Fracture Prediction Of Dual Phase Steels With Consideration Of Microstructures
… This class of sheet metals are prone to edge fracture during stamping production, and the fracture often occurs at much lower strain than that predicted based on the forming limit curves. The uncertainty in predicting edge fracture represents a great challenge in the application of AHSS. This …
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Predicting the equilibria of point defects in zirconium oxide : a route to understand the corrosion and hydrogen pickup of zirconium alloys
… This interplay was used to propose an oxide fracture mechanism by which hydrogen is picked up.
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Charnockite formation in southern India
… vapour-absent melting, so it may be an important mechanism for granulite and granite formation in the middle and lower crust. Massive charnockites (monotonous granulite) are believed to form mainly by direct crystallisation from a H<sub>2</sub>O-poor, CO<sub>2</sub>-rich melt. …
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On the Influence of Gamma-Irradiation Sterilisation and Ageing on the Fracture Properties of Ultra High Molecular Weight Polyethylene
… been attributed to a fatigue crack growth mechanism associated with a combination of high sub-surface cyclic shear stresses and degradation of the chemistry and structure of UHMW-PE caused by the gamma-irradiation sterilisation standard procedure. However, the exact mechanisms by which …
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Fracture analysis in biomimetic Bouligand architectures
… approach to investigate the mechanics and the fracture mechanism of the Bouligand structure. In particular, I study the propagation of a twisting crack that follows the helicoidal arrangement by following the fiber alignment. I carry out specific three-point bending experiments done on …
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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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CONFINED LAYERED POLYMERIC SYSTEMS FOR PACKAGING ANDCAPACITOR APPLICATIONS
… Research into the confined crystallization mechanism of the multilayered polymer films has resulted in several material case studies as well as an understanding of the chemical and thermodynamic parameters that control the degree and rate of the confinement in multilayer polymer systems. …
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Hierarchical Assembly Strategy and Multiscale Structural Origin of Exceptional Mechanical Performance In Nacre
… amorphous aggregation. The underlying physics mechanism why the aragonite nanoparticles choose highly-oriented attachment as its crystallization pathway is rationalized in terms of thermodynamics. The aragonite nanoparticle order-disorder transformation can be triggered by high temperature and …
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Evaluation of Cold Spray Process for Solid-State Welding
… To guide future optimization efforts, a failure mechanism in the CSWed parts is established. This research underscores the importance of addressing softening effects in welded materials, while also charting a new path to establishing a new unexplored solid-state welding technique that has the …
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Fabrication, Kinetics and Crystallography of Lithium Disilicate Glass-Ceramics
… second objective is to understand the nucleation mechanism and crystallization kinetics of lithium disilicate glasses by in situ and real-time observations of phase transition using X-ray diffraction (XRD) technique with the state-of-the-art synchrotron radiation. In the meantime, it is of …