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• W2016113349 abstract "Abstract Local stress/strain concept analysis using material properties for low-cycle fatigue can accurately predict fatigue life of casing strings exposed to variable loads. Standard approaches that assume only static loads ignore the variations in temperature and pressure that affect loads on casing strings during steam injection or in geothermal wells and lead to inaccurate estimates of fatigue life. Full-scale experimental results show that our method properly accounts for these variations, reducing time and cost in fatigue life prediction. Our method can be extended to any type of fatigue in which large deformations occur. Introduction The casing string is generally considered to be exposed to static or quasistatic loads. Mostly, these external loads act over long times, and therefore the assumption of static loads is correct. Current industry design standards consider the casing string to be statically loaded, ignoring changes in temperature or internal pressure in geothermal operations that can subject the string to variable loads and thus leading to fatigue failure. Because casing movement is restricted by the presence of a cement sheath, temperature variations induce thermal stresses in the casing string; these stresses may become greater than the material's yield strength. In such cases, the fatigue behavior of the casing material can be considered as low-cycle fatigue (LCF). Existing geometrical changes in the casing body (such as the thread) will amplify the local stress distribution and reduce the low-cycle fatigue resistance. Wöhler diagram or stress-number of cycles curve (S-N curve) is a way to represent the cyclic behavior of materials, see Figure 1. As the plot indicates, the higher the magnitude of the stress, the smaller the number of cycles to failure is. The horizontal curve at higher N values is characteristic to ferrous materials (steels) and it is called fatigue limit or endurance limit. On high stress values there is no endurance limit, and this is also characteristic to casing loads in which the induced stresses are higher then the material yield strength." @default.
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• W2016113349 date "2008-03-29" @default.
• W2016113349 modified "2023-09-27" @default.
• W2016113349 title "Casing Fatigue Life Prediction Using Local Stress Concept: Theoretical and Experimental Results" @default.
• W2016113349 doi "https://doi.org/10.2118/110785-ms" @default.
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