The evaluation of the elasto-plastic behavior in case of the honed steel pipes subjected to variable internal pressure

4th ModTech International Conference - Modern Technologies in Industrial Engineering

Steigmann, R.^1 ; Stanciu, M.D.^2 ; Szasz, M.^2 ; Curtu, I.^2 ; Sturzu, T.^2 ; Savin, A.^1

National Institute of Research and Development for Technical Physics, Nondestructive Testing Department, 47 D. Mangeron Blvd, Iasi

700050, Romania^1

Transylvania University of Brasov, Faculty of Mechanical Engineering, 29 Eroilor Blvd, 500036, Romania^2

关键词: Elastoplastic behavior;    Hydraulic oil;    Inner diameters;    Outer diameters;    Paper analysis;    Pipe material;    Rheological models;    Wall thickness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/145/2/022036/pdf
DOI  :  10.1088/1757-899X/145/2/022036

来源: IOP

【 摘 要 】

The paper analyses the elasto-plastic behavior of ten samples of E355 steel pipe of the same inner diameter, but with wall thickness ranging between 1.100 and 2.500 mm and length about 100 mm. The samples were subjected to variable internal pressure which was increased from 0 to 600-800 bar (up to the breaking of the pipe), being used the hydraulic oil, type HM46. The outer diameter of the tested pipes was measured successive for each increase of pressure with 100 bars, thus being determined the flow curve of the pipe material characterized by the elasto-plastic behavior and a tenacious failure. It was found that thin pipes, with the ratio between the inner and outer diameter less than 1.1, shows a different flow curve compare to pipes with thick walls, having the ratio between the inner and outer diameter greater than 1.1, the deformations being about two times higher. The rheological models of each type of pipes were identified.