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.
Results
Showing 1 to 12 of 12 for “"Critical Damage"”.
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Self-healing of impact damage in vascular fiber-reinforced composites
… vascular self-healing technologies. To date, the critical damage modes which occur during out-of-plane impact that most significantly contribute to reductions in post-impact performance have not been identified and methods for delivering healing agents to those critical regions using internal …
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Damage Reduction Strategies for a Falling Humanoid Robot
… unstable events occur they can result in costly damage to the robot potentially causing a cease of normal functionality. Therefore, it is important to study and develop methods to control a humanoid robot during a fall to reduce the chance of critical damage. This thesis proposes joint angular …
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Analysing method for acoustic emission clustering system on reinforced concrete beam
… a non-destructive testing (NDT) method used for damage detection in structural engineering. Nowadays, NDT is widely used especially on continuous real-time monitoring systems with minimum labour involvement. It could also be used to discriminate the different types of damage occurring in …
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A Comparison of Image Processing Techniques for Bird Detection
… animals. These wild birds and animals can cause critical damage to the produce. Traditional methods of scaring away birds such as scarecrows are not long-term solutions but short-term solutions. This is a huge problem especially near areas like San Luis Obispo where there are vineyards. Bird …
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Analytical and experimental investigation of microstructural alterations in bearing steel in rolling contact fatigue
… and propagation from inclusions. A new damage evolution equation coupled with a FE model is employed to account for the effect of mean stresses and alternating stresses simultaneously to investigate butterfly formation. The proposed damage evolution law matches experimentally observed …
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Design and Development of Damage-Tolerant Active Materials
… abrupt failure. This thesis aims to enhance the damage tolerance of active materials by designing multi-phase composites incorporating secondary phases that can “proactively” divert damage into more benign forms. The specific focus is on fusion structural metals subject to 14.1 MeV fast neutron …
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Surface Patterning and Rotordynamic Response of Annular Pressure Seals Used in Turbomachinery
… interactions take place. In addition, critical damage of rotordynamic components can result from high level vibrations of supporting bearing system, where the reduced rotor speed can lead to system operating near the rotor critical speed. Therefore, increased accuracy in modeling of …
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Nonlinear seismic analysis of quasi-isolation systems for earthquake protection of bridges
… local limit states and progression of damage in the bridge structure. A large scale parametric study carried out to investigate the quasi isolated system performance on different superstructure types, substructure types, substructure heights, foundations and isolation bearing types. …
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The role of the fiber/matrix interphase in the static and fatigue behavior of polymeric matrix composite laminates
… Results from X-ray radiography of fatigue-damaged specimens help to explain the relationship between the interphase and the initiation and propagation of life-critical damage mechanisms. Having observed the formative role played by the interphase in the performance of these laminates, an …
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Impact of cross section, web reinforcement and load history on the seismic performance of slender concrete walls
… load history the C-shaped walls have a similar damage progression leading to a buckling-rupture failure and a nearly identical strong-axis load-deformation response up to the peak flexural strength. However, bi-directionally loaded walls exhibit earlier onset of critical damage limit states and …
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Fracture Initiation and Propagation in Low Porosity Crystalline Rocks: Implications for Excavation Damage Zone (EDZ) Mechanics
… are commonly associated with introducing some damage to the surrounding rock mass through the initiation and propagation of fractures parallel to the excavation boundary due to disturbance to the in situ stress condition, as well as the excavation process quality. The induced fractures in depth …
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Non-destructive Microstructural Evaluation Of Yttria Stabilized Zirconia, Nickel Aluminides And Thermal Barrier Coatings Using Electrochemical Impedance Spectroscopy
… based on electrolyte penetration into sub-critical damage is proposed for the gradual decrease in the resistances of YSZ and TGO with prolonged thermal exposure. Observation of exposed metallic bond coat surface on the fracture surface, which readily provides conduction, was related to the …