Elastic-plastic behaviour of pipe bends with in-plane bending

1967 ◽  
Vol 2 (1) ◽  
pp. 84-90 ◽  
Author(s):  
P V Marçlal
Keyword(s):  
Experimental Results ◽  
Shells Of Revolution ◽  
Curved Pipe ◽  
Elastic Plastic ◽  
Plastic Behaviour ◽  
Out Of Plane ◽  
Plane Bending

The theory for the in-plane and out-of-plane bending of a curved pipe is reviewed by considering it as an extension of the theory for symmetrically loaded shells of revolution. This treatment is adopted with the intention of modifying an existing elastic-plastic programme for shells of revolution so that it can perform the analysis of pipe bends with in-plane bending. Results are presented for elastic and elastic-plastic behaviour of pipe bends with in-plane bending. These results agree with theoretical and experimental results found in the literature.

Elastic-Plastic Behaviour of Flush Nozzles in Spherical Pressure Vessels

1967 ◽  
Vol 9 (3) ◽  
pp. 182-189 ◽  
Author(s):  
P. V. Marcal ◽  
C. E. Turner
Keyword(s):  
Computer Program ◽  
Shell Theory ◽  
Pressure Vessels ◽  
Finite Width ◽  
Test Results ◽  
Shells Of Revolution ◽  
Elastic Plastic ◽  
Plastic Behaviour ◽  
Plastic Analysis ◽  
Spherical Pressure

A computer program for the elasto-plastic analysis of axially symmetrical shells of revolution has been modified to allow interaction loads at nozzle junctions to be distributed over bands of finite width, rather than the conventional concentrated lines of loading at the intersection of the shell centre-lines. Comparison with previously published test results for displacements, yield and collapse loads of flush nozzles shows that this modification greatly improves the predictions from those of conventional shell theory so that realistic behaviour of nozzle junctions can be forecast.

An experimental investigation of a right-angled single unreinforced mitred-bend subjected to various bending moments

1966 ◽  
Vol 1 (3) ◽  
pp. 248-263 ◽  
Author(s):  
N Jones ◽  
R Kitching
Keyword(s):  
Cross Section ◽  
Circular Cross Section ◽  
Bending Moment ◽  
Straight Tube ◽  
Bending Moments ◽  
Curved Pipe ◽  
Design Procedures ◽  
Out Of Plane ◽  
Plane Bending ◽  
Comprehensive Study

It is well known that, upon the application of an in-plane bending moment, the initially circular cross-section of a curved pipe tends to flatten and become approximately elliptical in shape making it much more flexible than an equivalent straight tube. Mitred-bends exhibit similar properties though the behaviour is far more complex. A comprehensive study of a 90° single unreinforced mitred-bend having a radius/thickness ratio of 19 has been performed by means of a stress-probing method. In order to make the work more complete, results have been obtained for a similar bend when subjected to out-of-plane bending and twisting moments. Experimental measurements of stress and flexibility for each type of loading are discussed and certain modifications suggested to existing design procedures.

Comparison of Failure Modes of Piping Systems With Wall Thinning Subjected to In-Plane, Out-of-Plane, and Mixed Mode Bending Under Seismic Load: An Experimental Approach

2010 ◽  
Vol 132 (3) ◽  
Author(s):  
Izumi Nakamura ◽  
Akihito Otani ◽  
Masaki Shiratori
Keyword(s):  
Dynamic Behavior ◽  
Failure Modes ◽  
Seismic Load ◽  
Piping System ◽  
Shake Table ◽  
Shake Table Tests ◽  
Wall Thinning ◽  
Piping Systems ◽  
Out Of Plane ◽  
Plane Bending

Pressurized piping systems used for an extended period may develop degradations such as wall thinning or cracks due to aging. It is important to estimate the effects of degradation on the dynamic behavior and to ascertain the failure modes and remaining strength of the piping systems with degradation through experiments and analyses to ensure the seismic safety of degraded piping systems under destructive seismic events. In order to investigate the influence of degradation on the dynamic behavior and failure modes of piping systems with local wall thinning, shake table tests using 3D piping system models were conducted. About 50% full circumferential wall thinning at elbows was considered in the test. Three types of models were used in the shake table tests. The difference of the models was the applied bending direction to the thinned-wall elbow. The bending direction considered in the tests was either of the in-plane bending, out-of-plane bending, or mixed bending of the in-plane and out-of-plane. These models were excited under the same input acceleration until failure occurred. Through these tests, the vibration characteristic and failure modes of the piping models with wall thinning under seismic load were obtained. The test results showed that the out-of-plane bending is not significant for a sound elbow, but should be considered for a thinned-wall elbow, because the life of the piping models with wall thinning subjected to out-of-plane bending may reduce significantly.

The elastic–plastic behaviour of foam under shock loading

Shock Waves ◽  
2012 ◽  
Vol 23 (1) ◽  
pp. 55-67 ◽  
Author(s):  
O. E. Petel ◽  
S. Ouellet ◽  
A. J. Higgins ◽  
D. L. Frost
Keyword(s):  
Shock Loading ◽  
Elastic Plastic ◽  
Plastic Behaviour

A study of the out-of-plane bending vibrations of aromatic CH groups in solution

1969 ◽  
Vol 10 (5) ◽  
pp. 523-525 ◽  
Author(s):  
A. V. Chekunov ◽  
I. A. Polyakova
Keyword(s):  
Bending Vibrations ◽  
Out Of Plane ◽  
Plane Bending

Stresses in Curved, Circular Thin-Wall Tubes

1963 ◽  
Vol 30 (1) ◽  
pp. 134-135
Author(s):  
E. A. Utecht
Keyword(s):  
Thin Wall ◽  
Bending Moments ◽  
Circular Tubes ◽  
Out Of Plane ◽  
Thin Walled ◽  
Plane Bending

Curves are presented which give stress intensification factors for curved, thin-walled circular tubes under various combinations of in-plane and out-of-plane bending moments.

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