The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Local stress factors of pipe-nozzle due to radial load, circumferential and longitudinal moments
Author:	Lin, Junyu
View Online:	njit-etd1993-109 (xii, 111 pages ~ 2.2 MB pdf)
Department:	Department of Mechanical and Industrial Engineering
Degree:	Master of Science
Program:	Mechanical Engineering
Document Type:	Thesis
Advisory Committee:	Sun, Benedict C. (Committee chair) Koplik, Bernard (Committee member) Chen, Rong-Yaw (Committee member) Droughton, John Vincent (Committee member)
Date:	1993-10
Keywords:	Pipe joints Nozzles Strains and stresses Finite element method
Availability:	Unrestricted
Abstract:	This thesis presents a series of stress factor data which provide more detailed information for the calculation of local stresses at the nozzle region, as well as the pipe region, of a pipe-nozzle intersection, subjected to an external radial load, circumferential bending moment, and longitudinal bending moment, respectively. The pipe and nozzle thicknesses are assumed to be identical. Numerical solutions are obtained through the use of the finite element method. In obtaining the numerical solutions via ANSYS, the quadrilateral element is used to simulate the thin shell pipe-nozzle geometries. The local stresses, at eight different points on both the pipe and the nozzle at the intersections of the pipe's symmetric planes ( longitudinal and transverse) are investigated. The resulting circumferential and longitudinal stresses, on the pipe and the nozzle, respectively, are first resolved into the bending and membrane components, and then further normalized into stress factors by the geometric parameters, beta, β, ( nozzle radius/pipe radius ), and gamma, γ, ( pipe radius/pipe thickness ). Presented in this thesis are sixteen ( 16 ) stress factor plots for the external radial loading, P, and eight ( 8 ) plots for the external circumferential moment, Mc, and longitudinal bending moment, ML. The values of beta vary from 0.1 to 0.9 with values for gamma varying from 10 to 300. However, in the nozzle stress factor plots, when the product of beta and gamma are less than ten the results are not included since they are not in the thin shell range.