Limit loads for piping branch junctions under internal pressure and in-plane bending—Extended solutions

• Published in: The International journal of pressure vessels and piping Vol. 85; no. 6; pp. 360 - 367
• Main Authors: Kim, Yun-Jae, Lee, Kuk-Hee, Park, Chi-Yong
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2008; Elsevier
• Subjects: Applied sciences; Branch junction; Exact sciences and technology; Finite element analysis; Fundamental areas of phenomenology (including applications); In-plane bending; Inelasticity (thermoplasticity, viscoplasticity...); Internal pressure; Limit load; Mechanical engineering. Machine design; Physics; Solid mechanics; Static elasticity (thermoelasticity...); Steel design; Steel tanks and pressure vessels; boiler manufacturing; Structural and continuum mechanics; Branch junction; Finite element analysis; In-plane bending; Limit load; Internal pressure; Branching; Carrying capacity; Yield criterion; Pressure vessel; Pipe; Modeling; Finite element method; Inelasticity; Elastoplasticity; Piping; Plastic limit; Bending; Yield strength; Limit state(deflection); Branching pipe; Pipe connection; Thin wall; Ultimate load
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/j.ijpvp.2007.11.007

The authors have previously proposed plastic limit load solutions for thin-walled branch junctions under internal pressure and in-plane bending, based on finite element (FE) limit loads resulting from three-dimensional (3-D) FE limit analyses using elastic–perfectly plastic materials [Kim YJ, Lee KH, Park CY. Limit loads for thin-walled piping branch junctions under internal pressure and in-plane bending. Int J Press Vessels Piping 2006;83:645–53]. The solutions are valid for ratios of the branch-to-run pipe radius and thickness from 0.4 to 1.0, and for the mean radius-to-thickness ratio of the run pipe from 10.0 to 20.0. Moreover, the solutions considered the case of in-plane bending only on the branch pipe. This paper extends the previous solutions in two aspects. Firstly, plastic limit load solutions are given also for in-plane bending on the run pipe. Secondly, the validity of the proposed solutions is extended to ratios of the branch-to-run pipe radius and thickness from 0.0 to 1.0, and the mean radius-to-thickness ratio of the run pipe from 5.0 to 20.0. Comparisons with FE results show good agreement.