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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estimation of the Ct parameter for primary creep

Leung, Chun-Pok 08 1900 (has links)
No description available.
2

A new multiaxial creep damage model based on the exhaustion of internal energy.

Ng, Lawrence Kiam Yam, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW January 2007 (has links)
The creep of materials is a research topic of major significance in the life assessment and design of many modern engineering components of advance technology such as: power generation plant, chemical plant, gas turbines, jet engines, spacecrafts, components made of plastics and polymers, etc. To predict the creep lives of such components, one necessary ingredient is a creep damage model. The current creep damage models are either too cumbersome to be readily employed and/or not sufficiently accurate for practical applications. This thesis describes a new creep damage model to overcome some of the major shortcomings in current creep damage/life prediction methods. The proposed model is relatively simple and readily applicable to industrial cases yet it is sufficiently accurate. The proposed model assumes that, on a macroscopic level, the energy dissipated in the material may be taken as a measure of creep damage induced in the material. In another words, creep damage is directly proportional to the absorbed internal energy density (IED), i.e., the internal energy per unit of volume. In this way, the model takes into account both multiaxial loading and deformation. The model is formulated when the creep constitutive relationships may be expressed by primary plus steadystate or steady-state alone (IED-SS) as well as for the cases when the material behaviour includes the creep tertiary region (IED-T). The proposed model has been verified by applying it to various components for which the experimental creep lives are available from literature including thick/thin cylindrical vessels, notch bars with various notch-root radii and materials, multi-material cross welds bars, and perforated biaxial plates. The predicted creep lives of these components by the proposed model (IED-SS and IED-T) are compared with the experimental results and those obtained by the Reference Stress Method (RSM). It is shown that the maximum errors in relation to the creep lives of the above-mentioned components are: 18% when IED-SS is applied, 38% when IED-T is applied, and 301% when RSM is applied. To estimate the effects of uncertainties in material data on the predicted creep life, a sensitivity analysis has been conducted. To this end and in relation to Norton creep law, material parameters such as creep stress coefficient and stress exponent are considered. In addition, the sensitivity analysis included the uncertainties related to the uniaxial creep rupture data. As might be expected, the results suggest that the predicted creep life is most sensitive to the creep stress. Finally, the present research reveals that the proposed model is simple, practical and can be used in conjunction with any commercial finite element code with creep analysis capabilities.
3

The nanoindentation size effects of creep

Li, Han, 李晗 January 2004 (has links)
published_or_final_version / abstract / toc / Mechanical Engineering / Master / Master of Philosophy
4

Creep effects in nanoindentation

Feng, Gang, 封剛 January 2001 (has links)
published_or_final_version / Mechanical Engineering / Master / Master of Philosophy
5

Creep in epoxy mortars

Beshore, Eric Allen, 1944- January 1972 (has links)
No description available.
6

Stereological assessment of the evolution of microstructural damage during creep

Mishra, Surendra 05 1900 (has links)
No description available.
7

Analysis of crack growth in creep-brittle materials

Hall, David Edward 08 1900 (has links)
No description available.
8

Creep crack growth characterization of SA-106 C carbon steel

Gill, Yancy 05 1900 (has links)
No description available.
9

An anisotropic continuum damage model for creep-dominated, multiaxial loading histories

Ho, Kwang-Il 12 1900 (has links)
No description available.
10

A probabilistic representation for drained creep in clays /

Chen, Dunstan Dou-Shen January 1977 (has links)
No description available.

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