FEM analysis of CHS X-joints on the effect of out-of - plane bending performance

2011 ◽  
Author(s):  
Yan Liu ◽  
Peng Deng
Keyword(s):  
Fem Analysis ◽  
Bending Performance ◽  
Out Of Plane ◽  
Plane Bending

Numerical Investigation on Strength of Tee Pipes Under In-Plane/Out-of-Plane Cyclic Loading

2019 ◽  
Author(s):  
Izumi Nakamura
Keyword(s):  
Plastic Region ◽  
Branch Pipe ◽  
Fem Analysis ◽  
Analytical Investigation ◽  
Failure Behavior ◽  
Butt Welding ◽  
Loading Direction ◽  
Out Of Plane ◽  
Pipe Joints ◽  
Plane Bending

Abstract It is known that the expected failure mode of piping systems under excessive seismic motion would be the fatigue failure at elbows or tees. Although there are a lot of experimental and analytical investigations on the strength and the failure behavior of elbows under seismic loading, there are a few studies on tee pipe joints particularly in the inelastic range. To clarify the characteristics of the strength of tee pipes under elastic-plastic region, investigations by FEM analysis were conducted. In this analytical investigation, steel butt-welding type tee pipe joints were considered. Two kinds of parameters were considered; 1) the loading direction (in-plane bending / out-of-plane bending), 2) the branch size (equal tee / unequal tee). From the analytical examination, the load-displacement relationship and the distribution of the accumulated plastic strain concentration position were obtained. The difference of the strength in the loading direction and the expected failure locations depending on the branch pipe size and the loading direction are discussed.

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.

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.

Out-of-Plane Bending (Opb) Test of Large Diameter Mooring Chains

2021 ◽  
Author(s):  
m.r. Karimi ◽  
J. Braun ◽  
E. Gooijer ◽  
P. Barros ◽  
E. Carlberg ◽  
...  
Keyword(s):  
Large Diameter ◽  
Out Of Plane ◽  
Plane Bending
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