Abstract
The leak area of circumferential through-thickness crack in pipe under bending depends on the position of the crack with respect to the bending plane. In leak-before-break (LBB) analysis, the assumption that the crack is symmetrically placed with respect to the bending plane is not necessarily conservative. In this work, the crack opening of circumferential cracks, off-centered with respect to the bending plane, was investigated experimentally. Here, three pipe geometries and two crack lengths were investigated. For each crack, the centred and two off-centered configuration were examined. The crack opening displacement (COD) distribution along the crack length was measured for two selected bending load levels using digital image correlation (DIC) technique. These measurements have been used for verifying the solution provided by the hodograph cone method (HCM) as proposed by Bonora [1].
Highlights
Leak Before Break criteria (LBB) provide a design route to assess if a crack can critically affect the structural integrity of a pipe or pressure vessel [2]
The maximum crack opening displacement (COD) was measured for the centered crack configuration for 2 =90° and for the three pipe thicknesses
COD measures were performed on pipes with different thickness, different crack length, and for different values of the off-crack angle
Summary
Leak Before Break criteria (LBB) provide a design route to assess if a crack can critically affect the structural integrity of a pipe or pressure vessel [2]. The HCM method is the only available solution that does not require extensive use of finite element simulation and allows quick estimation of the COD distribution and associated COA, given the crack length and the offaxis angle, and the maximum COD for the prescribed load in the centered crack configuration. For this reason, it is attractive for its potential use in design-by-analysis procedures. These results have been used to provide a physical evidence for the qualification of the HCM
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