Creep of Cylindrical Tube Subjected to Combined Axial Load and Internal Pressure at Elevated Temperatures

1969 ◽  
Vol 18 (186) ◽  
pp. 233-239
Author(s):  
Masateru OHNAMI ◽  
Katsuhiko MOTOIE ◽  
Nobuo YOSHIDA
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Elevated Temperatures ◽  
Cylindrical Tube

Rapid change of stresses in thickness direction in long orthotropic tube under internal pressure and axial load

2009 ◽  
Vol 211 (3-4) ◽  
pp. 323-336 ◽  
Author(s):  
Sergey V. Dmitriev ◽  
Nobuhiro Yoshikawa ◽  
Radik R. Mulyukov
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Rapid Change ◽  
Thickness Direction

scholarly journals Influence of axial load on internal pressure creep of Mod.9Cr-1Mo circumferential welded pipe

2015 ◽  
Vol 81 (827) ◽  
pp. 15-00021-15-00021 ◽  
Author(s):  
Takashi OGATA ◽  
Toshiki MITSUEDA ◽  
Hiroshi SAKAI
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Welded Pipe

scholarly journals Transverse Deformation of Pressurised Pipes With Different Axial Loads

2017 ◽  
Author(s):  
Martin Kristoffersen ◽  
Tore Børvik ◽  
Magnus Langseth ◽  
Håvar Ilstad ◽  
Erik Levold
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Tensile Load ◽  
Displacement Curve ◽  
Design Codes ◽  
Axial Loads ◽  
Axial Tensile ◽  
Local Dent ◽  
Force Displacement ◽  
Good Agreement

Pipelines residing on the seabed are exposed to various hazards, one of them being denting, hooking and release of the pipeline by e.g. anchors or trawl gear. As a pipeline is displaced transversely in a hooking event, an axial tensile load resisting the displacement builds up in the pipeline. This study examines the effect of applying three different axial loads (zero, constant, and linearly increasing) to a pipe while simultaneously deforming it transversely. A fairly sharp indenter conforming to the prevailing design codes was used to deform the pipes. These three tests were repeated with an internal pressure of about 100 bar for comparison. Adding an axial load appeared to increase the pipe’s stiffness in terms of the force-displacement curve arising from deforming the pipe transversely. The internal pressure also increased the stiffness, and produced a more local dent in the pipe compared with the unpressurised pipes. All tests were recreated numerically in finite element simulations. Generally, the results of the simulations were in good agreement with the experiments.

Creep rupture behaviour of circumferentially welded mod. 9Cr–1Mo steel pipe subject to internal pressure and axial load

2016 ◽  
Vol 33 (6) ◽  
pp. 636-643 ◽  
Author(s):  
Takamitsu Himeno ◽  
Yasuharu Chuman ◽  
Takumi Tokiyoshi ◽  
Takuya Fukahori ◽  
Toshihide Igari
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Creep Rupture ◽  
Steel Pipe

Fiber-Reinforced Membrane Models of McKibben Actuators

2003 ◽  
Vol 70 (6) ◽  
pp. 853-859 ◽  
Author(s):  
W. Liu ◽  
C. R. Rahn
Keyword(s):  
Axial Load ◽  
Cylindrical Tube ◽  
Longitudinal Axis ◽  
Fiber Reinforced ◽  
Initial Shape ◽  
Fiber Angle ◽  
Inner Pressure ◽  
Membrane Models ◽  
Mckibben Actuators ◽  
Inextensible Fibers

A McKibben actuator consists of an internally pressurized elastic cylindrical tube covered by a shell braided with two families of inextensible fibers woven at equal and opposite angles to the longitudinal axis. Increasing internal pressure causes the actuator to expand radially and, due to the fiber constraint, contract longitudinally. This contraction provides a large force that can be used for robotic actuation. Based on large deformation membrane theory, the actuator is modeled as a fiber-reinforced cylinder with applied inner pressure and axial load. Given the initial shape, material parameters, axial load, and pressure, the analytical model predicts the deformed actuator shape, fiber angle, and fiber and membrane stresses. The analytical results show that for a long and thin actuator the deformed fiber angle approaches 54°44′ at infinite pressure. The actuator elongates and contracts for actuators with initial angles above and below 54°44′ degrees, respectively. For short and thick actuators with initial angles relatively close to 0 deg or 90 deg, however, a fiber angle boundary layer extends to the middle of the actuator, limiting possible extension or contraction. The calculated longitudinal strain and radius change match experimental results to within 5%.

Buckling of Double Bellows Expansion Joints under Internal Pressure

1964 ◽  
Vol 6 (3) ◽  
pp. 270-277 ◽  
Author(s):  
D. E. Newland
Keyword(s):  
Internal Pressure ◽  
Axial Load ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Supporting Structure ◽  
Universal Expansion ◽  
Critical Buckling Pressure

Corrugated bellows expansion joints may buckle under internal pressure in the same way as an elastic strut may buckle under an axial load. This paper is concerned with the analysis of this phenomenon for the ‘universal expansion joint’ which incorporates two bellows joined by a length of rigid pipe. The principal conclusion is that, by providing a correctly designed supporting structure, the critical buckling pressure can be increased to up to four times its value for the same system with no supports.

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