Reference Stresses for Cold-Tube-Bends Including Thickness Variation and Ovality Using Three-Dimensional Finite Element Method

Tube-bends are extensively used in the boilers of power plants. Tube-bends are manufactured by bending a straight tube section. During this process, the tube cross-section becomes oval and its thickness varies around the circumference of its cross-section. This study uses three-dimensional finite element analysis to establish practical and simple equations for predicting the plastic collapse pressures and the reference stresses of the oval and variable thickness boiler-tube-bends. Such equations are pertinent to the design and integrity assessment of the boiler tube-bends.

Stress and Strength of Butt Circular Shaft With Metal Columns Subjected to Torques

Design Engineering ◽

10.1115/imece2004-60042 ◽

2004 ◽

Author(s):

Jiemin Liu ◽

Jintang Liu ◽

Toshiyuki Sawa

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Stress Analysis ◽

Yield Stress ◽

Cross Section ◽

Three Dimensional ◽

Adhesive Layer ◽

Circular Shaft ◽

Stress analysis of the butt circular shaft with three uniformly distributed metal columns subjected to external torques are carried out by using three-dimensional finite element method. The loading capability of the butt circular shaft is measured. It was found that torque acting on the cross-section of adhesive layer is simultaneously withstood by the adhesive layer and the metal columns; The ratio of the torque withstood by metal columns to that withstood by adhesive layer increases with increase of the ratio of Young’s modulus of metal columns to that of the circular shaft; The metal columns enhance and improve the reliability of the joints; The strength of the butt adhesive circular shafts increases with increase of the ratio of the yield stress of the metal columns to that of circular shafts.

Three Dimensional Finite Element Analyses of Welding Residual Stresses of a Repaired Weld

Volume 3B: Design and Analysis ◽

10.1115/pvp2018-84343 ◽

2018 ◽

Cited By ~ 1

Author(s):

Mingya Chen ◽

Weiwei Yu ◽

Fei Xue ◽

Francis Ku ◽

Zhilin Chen ◽

...

Keyword(s):

Finite Element ◽

Residual Stresses ◽

Nuclear Power ◽

Power Plants ◽

Three Dimensional ◽

Fe Model ◽

Surge Line ◽

Line Slope ◽

The objective of this study is to correct installation non-conformance of a surge line using the excavation and re-weld method which is widely used in nuclear power plants. The surge line with a backslope was not at the required design level after initial installation. In order to solve the problem, a repairing technology is shown as follows: the weld was successively excavated and welded again while the surge line slope was corrected with the help of jacks. Because many of the degradation mechanisms relevant to power plant components can be accelerated by the presence of welding residual stresses (WRS), the WRS caused by the repairing process need to be studied. In this paper, the WRS simulation technique employed in this project is sophisticated. It utilizes a 3-D finite element (FE) model, and simulates the weld sequencing and excavation. Moreover, the WRS simulation performed in this project not only uses the un-axisymmetric model, but also considers the deformation caused by the external jacking loads. The results show that the repairing process is effective, and strain damage induced by the welding repair is also acceptable.

Seismic analysis of nuclear power plants by using three-dimensional finite element models: a review

Journal of Nuclear Science and Technology ◽

10.1080/00223131.2018.1532846 ◽

2018 ◽

Vol 56 (1) ◽

pp. 1-16 ◽

Cited By ~ 4

Author(s):

Shohei Onitsuka ◽

Tadashi Iijima ◽

Tomonori Yamada ◽

Shinobu Yoshimura

Keyword(s):

Finite Element ◽

Nuclear Power ◽

Power Plants ◽

Nuclear Power Plants ◽

Seismic Analysis ◽

Three Dimensional ◽

Finite Element Models ◽

Finite-Element Simulation of Progressive Cross-Section Ellipticity of Single Crystal Samples under Uniaxial Tension

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.725-726.937 ◽

2015 ◽

Vol 725-726 ◽

pp. 937-942

Author(s):

Mikhail Beliaev ◽

Artem S. Semenov

Keyword(s):

Finite Element ◽

Single Crystal ◽

Uniaxial Tension ◽

Cross Section ◽

Axial Strain ◽

Three Dimensional ◽

Element Simulation ◽

Plastic Deformation Process ◽

The influence of the crystallographic orientation, the level of axial strain and the test temperature on the progressive cross-section ellipticity of single crystal samples under uniaxial tension is analyzed in order to improve axial strain measurement in experiments. The direct three-dimensional finite element modeling of elasto-plastic deformation process of single-crystal initially cylindrical samples is used with taking into account finite strains, slip mechanisms and necking.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

Tire Science and Technology ◽

10.2346/1.2768607 ◽

2007 ◽

Vol 35 (3) ◽

pp. 226-238 ◽

Cited By ~ 1

Author(s):

K. M. Jeong ◽

K. W. Kim ◽

H. G. Beom ◽

J. U. Park

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Three Dimensional ◽

Element Model ◽

Radial Force ◽

Element Analysis ◽

The Finite Element Analysis ◽

Force Variation ◽

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.