Mode I stress intensity factors for pressurized pipes with multiple cracks: Two coplanar identical semi-elliptical internal surface cracks in the longitudinal direction

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2025-03-26 DOI:10.1016/j.ijpvp.2025.105520

Patchanida Seenuan, Nitikorn Noraphaiphipaksa, Chaosuan Kanchanomai

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Abstract

Pipe failures often result from clustered or multiple cracks, with severity quantified by the stress intensity factor (K). For pressurized pipes with multiple cracks, specifically two coplanar identical semi-elliptical internal surface cracks oriented longitudinally, API 579–1/ASME FFS-1 suggests combining cracks into a single equivalent crack when the crack spacing is small. However, the interaction mechanism and criteria for this approach remain unclear. This study used finite element analysis to investigate the Mode I stress intensity factor (K_I) in pressurized pipes with two coplanar semi-elliptical cracks. Various factors influencing interaction were analyzed, including pipe dimensions, crack depths, crack geometries, crack spacings, and internal pressures. Results showed a rapid decrease in K_I near the surface point of crack due to the free surface effect. As crack spacing decreased, interaction effects increased, leading to higher K_I values for multiple cracks compared to a single crack. Interaction was most pronounced at the surface point where cracks connect, caused by stress superposition. The threshold spacing for no interaction increased with crack depth and was consistent across different pipe dimensions and crack geometries. Reducing internal pressure effectively mitigated interaction effects. These findings offer criteria for evaluating crack interaction and guidance for maintaining the structural integrity of pressurized pipes with multiple cracks.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.