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http://dx.doi.org/10.3795/KSME-A.2014.38.11.1207

Crack-tip Stress Field of Fully Circumferential Surface Cracked Pipe Under Combined Tension and Thermal Loads  

Je, Jin Ho (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Dong Jun (Dept. of Mechanical Engineering, Korea Univ.)
Kim, Yun Jae (Dept. of Mechanical Engineering, Korea Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.38, no.11, 2014 , pp. 1207-1214 More about this Journal
Abstract
Under excessive plasticity, the fracture toughness of a material depends on its size and geometry. Under fully yielded conditions, the stresses in a material near its crack tip are not unique but rather depend on the geometry. Therefore, the single-parameter J-approach is limited to a high-constraint crack geometry. The JQ theory has been proposed for establishing the crack geometry constraints. This approach assumes that the crack-tip fields have two degrees of freedom. In this study, the crack-tip stress field of a fully circumferential surface-cracked pipe under combined loads is investigated on the basis of the JQ theory by using finite element analysis. The combined loads are a tensile axial force and the thermal gradient in the radial direction. Q-stresses of the crack geometry and its loading state are used to determine the constraint effects. The constraint effects of secondary loading are found to be greater than those of primary loading. Therefore, thermal shock is believed to be the most severe loading condition of constraint effects.
Keywords
Crack-Tip; Constraint Effect; Q-Stress; FE Analysis; Pipe; Combined Loads;
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