Effect of pipe expansion on the redistribution of residual stresses after molding

2020 ◽  
Vol 10 (2) ◽  
pp. 122-126
Author(s):  
Nikolay A. Makhutov ◽  
◽  
Dmitry A. Neganov ◽  
Eugeny P. Studenov ◽  
◽  
...  
Keyword(s):  
Residual Stresses ◽  
Strain Distribution ◽  
Strain State ◽  
Stress And Strain ◽  
Cylindrical Shape ◽  
Pipe Material ◽  
Pipe Expansion ◽  
Calculation Results ◽  
Residual Deformations ◽  
Stress And Strain Distribution

In the factory, pipes for trunk oil and oil product pipelines are obtained by molding and welding. To ensure a cylindrical shape and reduce technological residual stresses, expansion technology is used. Pipe expansion causes a significant change in the values of residual deformations and stresses. The article presents both the calculation results and graphs regarding stress and strain distribution during bending of the stock and their redistribution after expansion. Based on the calculation results, the final total values of residual stresses and residual deformations caused by bending and expansion were stated to be important components of the stress-strain state observed in pipelines being operated under cyclic loading, as well as those used in assessing how degradation affects the ductility of the pipe material. These factors were concluded as being reasonably taken into account when performing verification calculations regarding long-running pipelines if, based on their diagnostics and analysis, their state does not meet modern strength requirements.

scholarly journals ANALYSIS OF CONSTRUCTION ON ELASTIC FOUNDATION WITH EVALUATION OF ALL SYSTEM DEAD WEIGHT/KONSTRUKCIJŲ ANT TAMPRAUS PAGRINDO SKAIČIAVIMAS ĮVERTINANT VISOS SISTEMOS SAVĄJĮ SVORĮ

2001 ◽  
Vol 7 (2) ◽  
pp. 115-121
Author(s):  
Andrius Grigusevičius ◽  
Stanislovas Kalanta ◽  
Antanas Krutinis
Keyword(s):  
Elastic Foundation ◽  
Strain Distribution ◽  
Strain State ◽  
Contact Problems ◽  
Stress And Strain ◽  
System Construction ◽  
Dead Weight ◽  
The Dead ◽  
Stress And Strain Distribution ◽  
Distribution Of Stresses

Solution of constructions on an elastic foundation was formulated as the contact problem [1], [2]. With such a formulation the stress and strain state is investigated at the contact of construction and foundation. Therefore, we can not evaluate the influence of elastic foundation dead weight for stress and strain distribution in the soil. The aim of this article is to solve this pressing problem, which allows to define in more precise way the stress and strain state in the system, and to evaluate not only the dead weight of the construction, but also the dead weight of foundation. The system “construction-substructure-foundation” is investigated as an interaction of separate bodies. Such a formulation allows to go over from solving contact problems to the solution of qualitatively new problems in which the distribution of stresses and strains in foundation along the depth is evaluated. Mathematical models in this article are realised by computer programme COSMOS/M. The stress-strain state is determined by describing the system “wall-substructure-foundation” of elements with different physical-mechanical indices.

Study on Stress and Strain of Anchorage Using Finite Element Method

2013 ◽  
Vol 325-326 ◽  
pp. 1314-1317
Author(s):  
Cong Sheng Chen ◽  
Ping He ◽  
Cheng Yong Wang ◽  
Xue Hui Chen ◽  
Lei Huang ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain Distribution ◽  
Maximum Stress ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Integrated Modeling ◽  
Stress And Strain ◽  
Steel Strand ◽  
Prestressed State ◽  
Stress And Strain Distribution

Three-dimensional integrated modeling method and the numerical simulation of elastoplastic finite element are adopted in the paper. The mechanical response of the five holes anchorage is analyzed in certain prestressed state. The stress and strain distribution information of the anchor ring, clip and steel strand is obtained respectively, and the structure safety is discussed by investigating on the maximum stress and strain.

Finite Element Analysis of Metal Flow of Finishing Groove in Hot Continuous Rolling Bar

2012 ◽  
Vol 510 ◽  
pp. 667-672
Author(s):  
Jia Lin Zhou ◽  
Chen Gang Pan ◽  
Xiao Yong Zhang
Keyword(s):  
Strain Distribution ◽  
Metal Flow ◽  
Dimensional Accuracy ◽  
Stress And Strain ◽  
Fe Model ◽  
Element Analysis ◽  
Iron And Steel ◽  
Expansion Angle ◽  
The Stability ◽  
Stress And Strain Distribution

This article established 3D FE model of dual-radius arc finishing groove and tangent expansion angle finishing groove using ANSYS / LS-DYNA software for Wuhan Iron and Steel plant Ф16 hot continuous bar, and analyzed metal flow pattern, stress and strain distribution of two types finishing grooves. The results show that surface stress and strain distribution of dual-radius arc finishing groove have better uniform than them of tangent expansion angle finishing groove, and dual-radius arc finishing groove ensures the stability of the rolled piece in finishing groove, improve the dimensional accuracy and surface quality of rolled finishing product.

Lightweight Design of Shipbuilding Gantry Crane Structure Based on FEA

2011 ◽  
Vol 474-476 ◽  
pp. 131-136 ◽  
Author(s):  
Ming Liang Yang ◽  
Ge Ning Xu ◽  
Zheng Yan Chang
Keyword(s):  
Strain Distribution ◽  
Large Scale ◽  
Lightweight Design ◽  
Metal Structure ◽  
Structure Design ◽  
Gantry Crane ◽  
Stress And Strain ◽  
Analytical Computation ◽  
Structural Improvement ◽  
Stress And Strain Distribution

For the sake of working safely and stable, large-scale shipbuilding gantry crane was designed based on the principle of metal structure:3S,Strength,Stiffness,Stability. The detailed finite element analytical computation was successfully carried out on this structure, the stress and strain distribution of this structure were obtained under various actual operations. On the basis of it, the structural improvement was carried out, the result of design indicated that the stress was evident and the weight was lightened. This laid a foundation for the structure design of large-scale shipbuilding gantry crane.

Investigation of PDC Cutter Interface Geometry Using 3D FEM Modelling

2017 ◽  
Vol 29 ◽  
pp. 45-53 ◽  
Author(s):  
Seyed Ali Heydarshahy ◽  
Shivakumar Karekal
Keyword(s):  
Strain Distribution ◽  
High Stress ◽  
Polycrystalline Diamond ◽  
Shear Loading ◽  
Stress And Strain ◽  
3D Fem ◽  
Interface Shear ◽  
Interface Elements ◽  
Premature Failure ◽  
Stress And Strain Distribution

Polycrystalline Diamond Compact (PDC) cutters have been popularly used in recent times due to their resistance against mechanical and thermal wear. This paper was focused on interface geometries between the substrate and the diamond table. Various types of interfaces were designed, to investigate how different interface geometries influence distribution of stress and strain under shear loading. The interface geometries examined in this paper included castle interface, dent interface, honeycomb interface and chase interface. Parallel to the interface, shear loading was applied to the top of diamond table to mimic the shear loading component from the rock cutting. To apply the shear loading, two locations were considered for each of the geometries. These locations differed depending on the interface features. Stress and strain distribution and values across different interface geometries were analysed with the aid of 3D Finite Element Method (FEM). The numerical simulations indicated that stress and strain magnitudes and distribution patterns varied in relation to different geometries. Some substrates showed relatively lower plastic strain representing higher durability of the geometries. Concentration of stress and strain distribution showed the areas where one could expect weakness. It also implies that rotating the PDC cutter assemblies around their cylindrical axis helps avoiding fatigue of interface elements in regions of high stress concentration; and thus, preventing premature failure of interface elements.

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