Effect of bend angle on plastic limit loads of pipe bends under different load conditions. (October 2017)

• Record Type: Journal Article
• Authors: Li, Shun-Jie; Zhou, Chang-Yu; Li, Jian; Pan, Xiang-Ming; He, Xiao-Hua
• Is Part Of: International journal of mechanical sciences. Volume 131/132(2017)
• Page Start: 572
• Page End: 585
• Publication Date: 2017-10
• Subjects: Pipe bends -- Bend angle -- Limit load -- Finite element analysis; LPF load proportionality factor -- TES twice-elastic slope -- FE finite element; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2017.08.019
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: The pipe bends show different deformation characteristics under different load conditions. With the increase of bend angle, the limit load of pipe bend decreases. The unified solutions of limit loads under internal pressure, in-plane closing bending moment, in-plane opening bending moment, out-of-plane bending moment and torsion moment are obtained. Abstract: The effect of bend angle on plastic limit loads of pipe bends under different load conditions is presented using three-dimensional non-linear finite element analyses. Based on finite element analysis, the characteristics of deformation, stress and strain were studied and effect of bend angle on the limit load was discussed. The results show that the effect of bend angle on limit load is great both at 0°∼120° range under internal pressure, torsion moment and in-plane bending moment and at 0°∼90° under out-of-plane moment. Then existing expressions of limit load and the finite element results were compared, and the solutions of limit load under single load condition were made. The proposed unified load solutions were obtained by fitting the finite element data under internal pressure, in-plane bending moment, out-of-plane bending moment and torsion moment. The results show that the proposed unified load solutions are consistent and in good agreement with the current finite element results. Graphical abstract: