Nonlinear Analysis of Pipe Bends Subjected to Out-of-Plane Moment Loading and Internal Pressure

Author:

Mourad Hashem M.1,Younan Maher Y. A.1

Affiliation:

1. The American University in Cairo, Engineering Department, Cairo 11511, Egypt

Abstract

The behavior of a pipe bend, with bend factor h=0.1615(D=16 in.,R=24 in. and t=0.41 in.), subjected to out-of-plane bending and internal pressure is studied, taking geometric and material nonlinearity into account, using the finite element code ABAQUS. Material behavior is taken as elastic-perfectly plastic. The distribution of stress and strain along the axial direction and across the thickness of the bend is studied, with and without internal pressure, at the onset of yielding and at instability. Before instability is reached, through-the-thickness yielding appears at many points. The loaded end of the bend is found to be the most severely strained cross section. The circumferential distribution of stress and strain, and its variation with increased moment loading are then investigated for that section, at internal pressure values of zero and 1200 psi.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference20 articles.

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2. Von Ka´rma´n, Th. , 1911, “U¨ber die Forma¨nderung du¨nnwandiger Ro¨hre, insbesondere federnder Ausgleichro¨hre,” Z. Ver. Deutsc. Ingen., 55, pp. 1889–1895.

3. Vigness, I. , 1943, “Elastic Properties of Curved Tubes,” Trans. ASME, 65, pp. 105–120.

4. Rodabaugh, E. C., and George, H. H., 1957, “Effect of Internal Pressure on Flexibility and Stress-Intensification Factors of Curved Pipe or Welding Elbows,” Trans. ASME, 79, pp. 939–948.

5. Dodge, W. G., and Moore, S. E., 1972, “Stress Indices and Flexibility Factors for Moment Loadings on Elbows and Curved Pipe,” Weld. Res. Counc. Bull., 179, pp. 1–19.

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