scholarly journals Effect of Squeeze-out and Sizing Ratio to The Residual Circumferential Stress of HFW Pipe

2019 ◽  
Vol 269 ◽  
pp. 04005
Author(s):  
Siens Harianto ◽  
Elang Susilaputra ◽  
Peter Darto ◽  
Ardian Fandika
Keyword(s):  
Negative Impact ◽  
Circumferential Stress ◽  
Forming Process ◽  
Trial Test ◽  
Squeeze Out ◽  
Welded Pipe ◽  
Elastic And Plastic Deformation ◽  
Outside Diameter ◽  
Pipe Manufacturing ◽  
Pipe Mill

Residual circumferential stress originates from pipe forming process has a negative impact on the pressure carrying capacity; therefore it is necessary to keep the level of residual stress as low as possible and distributed uniformly around the pipe. Manufacturing of HFW (High-Frequency Welded) pipe involves pinching, bending, forming, welding, squeezing, sizing and straightening processes in several stages which produce both elastic and plastic deformation. Those processes produce residual stresses in the pipe wall in the circumferential and longitudinal directions. This paper presents the result of the trial test to investigate the effect of squeeze-out (SO) and the sizing ratio (SR) to the residual circumferential stress on HFW pipe. The trial was performed at PT INDAL STEEL PIPE (ISP) pipe mill, on pipe API 5L L360MO PSL2, nominal Outside Diameter (OD) 273 mm, wall thickness 12.7 mm. The SO was 0.7t and 0.9t, while the SR was set at 0.5 %, 0.8 %, and 1.0 %.

A Simulation of the Post-Bending Process of the Pipe Billets for Welded Pipe Manufacturing

2020 ◽  
Vol 299 ◽  
pp. 676-680 ◽  
Author(s):  
Dmitry Frunkin ◽  
Leonid Moiseevich Gurevich ◽  
Roman Novikov
Keyword(s):  
Standard Method ◽  
Software Package ◽  
Sheet Thickness ◽  
Pipe Axis ◽  
Bending Process ◽  
Welded Pipe ◽  
Pipe Manufacturing

The paper presents a result of the simulation of the post-bending process of the pipe billet, using the MSC.Marc software package. It was shown that the use of a standard method for carrying out post-bending process leads to the formation of various defects, such as a variable gap between the edges along the pipe axis, vertical waves and bends at the edges, as well as a decrease in a sheet thickness on the edges.

scholarly journals Numerical investigation on the forming behaviour of stainless/carbon steel bimetal composite

2018 ◽  
Vol 185 ◽  
pp. 00012
Author(s):  
Zhou Li ◽  
Jingwei Zhao ◽  
Qingfeng Zhang ◽  
Sihai Jiao ◽  
Zhengyi Jiang
Keyword(s):  
Carbon Steel ◽  
Circumferential Stress ◽  
Tensile Tests ◽  
Uniaxial Tensile ◽  
Composite Sheet ◽  
Forming Process ◽  
Thickness Strain ◽  
Forming Simulation ◽  
Bimetal Composite ◽  
Forming Behaviour

Bimetal composites have wide applications due to their excellent overall performance and relatively low comprehensive cost. The aim of this study is to investigate the forming behaviour of stainless/carbon steel bimetal composite during stamping by finite element method (FEM). In this work, the bonding interface of bimetal composite sheet was assumed to be perfect without delamination during the plastic forming process for simplicity. Uniaxial tensile tests on base metal (carbon steel) and compositing metal (stainless steel) were first carried out, respectively, in order to obtain the tensile properties of each of the component materials required in the forming simulation. Processing variables, including the layer stacking sequence, relative thickness ratios of two layers and friction were considered, and their effects on the distributions of circumferential stress and thickness strain were analysed. The bimetal composite sheet was set as the eight-node solid elements in the developed FEM model, which is effective for evaluating the distributions of circumferential stress and thickness strain, and predicting the high-risk region of necking during the stamping of bimetal composites. The simulation results can be used as an evaluation indicator of the capability of forming machine to ensure the bimetal composite can be safely formed.

Numerical Simulation of JCO Pipe Forming Process and its Effect on the External Pressure Capacity of the Pipe

2017 ◽  
Author(s):  
Giannoula Chatzopoulou ◽  
Konstantinos Antoniou ◽  
Spyros A. Karamanos
Keyword(s):  
Manufacturing Process ◽  
Large Diameter ◽  
Structural Response ◽  
Structural Instability ◽  
External Pressure ◽  
Forming Process ◽  
Line Pipe ◽  
Structural Capacity ◽  
Large Diameter Pipes ◽  
Pipe Manufacturing

Large-diameter thick-walled steel pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to excessive pipe ovalization with catastrophic effects. The resistance of offshore pipes against this instability mode strongly depends on imperfections and residual stresses introduced by the line pipe manufacturing process. In the present paper, the JCO pipe manufacturing process, a commonly adopted process for producing large-diameter pipes of significant thickness, is examined. The study examines the effect of JCO line pipe manufacturing process on the structural response and resistance of offshore pipes during the installation process using nonlinear finite element simulation tools. At first, the cold bending induced by the JCO process is simulated rigorously, and subsequently, the application of external pressure is modeled until structural instability is detected. For the simulation of the JCO manufacturing process and the structured response of the pipe a two dimensional generalized plane strain model is used. Furthermore, a numerical analysis is also conducted on the effects of line pipe expansion on the structural capacity of the JCO pipe.

Three-Dimensional Finite Element Analysis of Temperatures and Stresses in a Single-Pass Butt-Welded Pipe

1990 ◽  
Vol 112 (1) ◽  
pp. 76-84 ◽  
Author(s):  
R. I. Karlsson ◽  
B. L. Josefson
Keyword(s):  
Finite Element ◽  
Circumferential Stress ◽  
Three Dimensional ◽  
Manganese Steel ◽  
Outer Diameter ◽  
Single Pass ◽  
Welding Sequence ◽  
Dimensional Finite Element ◽  
Welded Pipe ◽  
Three Dimensional Finite Element

Temperatures, stresses, and deformations in a single-pass butt-welded pipe are studied with a full three-dimensional finite element model. The model covers the whole circumference and the complete welding sequence; i.e., no assumption of axi-symmetry is made. The pipe studied has an outer diameter of 114.3 mm and a wall thickness of 8.8 mm. The material is carbon-manganese steel. The MIG-welding simulated results in a very high cooling rate. Low-temperature solid-state phase transformations, therefore, become significant and of importance to the residual stress field. The material model in the FE-code used (ADINA) is extended for that purpose. Notable calculated results are the residual compressive hoop stresses in the weld and the residual circumferential stress variations, especially in the beginning and end regions of the weld.

Mastering the bending and drawing of skelp in the line of a 73-219 electric-welded pipe mill at the Severskii Pipe Plant

Metallurgist ◽  
2009 ◽  
Vol 53 (5-6) ◽  
pp. 356-358
Author(s):  
I. T. Totskii ◽  
A. S. Anan’ev ◽  
O. L. Markin ◽  
A. N. Shchennikov
Keyword(s):  
Pipe Plant ◽  
Welded Pipe ◽  
Pipe Mill

scholarly journals Numerical Simulation of JCO-E Pipe Manufacturing Process and Its Effect on the External Pressure Capacity of the Pipe1

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Konstantinos Antoniou ◽  
Giannoula Chatzopoulou ◽  
Spyros A. Karamanos ◽  
Athanasios Tazedakis ◽  
Christos Palagas ◽  
...  
Keyword(s):  
Manufacturing Process ◽  
Large Diameter ◽  
Welding Process ◽  
Structural Instability ◽  
External Pressure ◽  
Forming Process ◽  
Line Pipe ◽  
Geometric Deviations ◽  
Large Diameter Pipes ◽  
Pipe Manufacturing

Large-diameter thick-walled steel pipes during their installation in deep-water are subjected to external pressure, which may trigger structural instability due to pipe ovalization, with detrimental effects. The resistance of offshore pipes against this instability is affected by local geometric deviations and residual stresses, introduced by the line pipe manufacturing process. In the present paper, the JCO-E pipe manufacturing process, a commonly adopted process for producing large-diameter pipes of significant thickness, is examined. The study examines the effect of JCO-E line pipe manufacturing process on the external pressure resistance of offshore pipes, candidates for deepwater applications using nonlinear finite element simulation tools. The cold bending induced by the JCO forming process as well as the subsequent welding and expansion (E) operations are simulated rigorously. Subsequently, the application of external pressure is modeled until structural instability (collapse) is detected. Both the JCO-E manufacturing process and the external pressure response of the pipe, are modeled using a two-dimensional (2D) generalized plane strain model, together with a coupled thermo-mechanical model for simulating the welding process.

The Analysis to the Forming Process of Welded Pipe by Non-Linear Finite Element Method

2011 ◽  
Vol 291-294 ◽  
pp. 585-589
Author(s):  
Jin Duo Ye ◽  
Zhe Li ◽  
Yu Ting Xi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Roll Forming ◽  
Parameter Study ◽  
Forming Process ◽  
Whole Process ◽  
Non Linear ◽  
Welded Pipe ◽  
Element Method

Understanding the mechanism of the forming of the welded pipe may help the engineer to design the shape of forming rollers and forming technology. It is hard to study the forming process of the welded pipe by both the method of experiment and numerical modeling because of too much nonlinear factors included in the forming process such as elastic-plastic large deformation and non linear contact. Although many research works have been conducted in this field by the method of experiment or numerical modeling, but few of the works deal with the whole forming process of the welded pipe. The main difficulties in the numerical modeling are of huge computational labor time, witch has been over the ability of the hardware and software of the computer. The whole process of roll forming of welded pipe has been simulated by nonlinear finite element method with ANSYS and LS-DYNA solver, the distribution of both stresses and strains have been got successfully. Mapping meshes and the rigid models for rollers have been used in the analysis in order to decrease the number of the elements. Numerical results and parameter study have shown that the forming rollers of both the level and vertical are the key factors to the forming process. It is believe that the method used in the paper can also be used to study the forming process of both cage roll forming and flexible forming.

Constitutive Model of TRIP600 Based on Rheological Theory

2016 ◽  
Vol 850 ◽  
pp. 370-378
Author(s):  
Ji Quan Sun ◽  
Chuang Niu ◽  
Yan Jun Yin ◽  
Sheng Yang Teng
Keyword(s):  
Constitutive Model ◽  
Deformation Process ◽  
Retained Austenite ◽  
Model Building ◽  
Constitutive Models ◽  
Creep Condition ◽  
Hard Phase ◽  
Forming Process ◽  
Trip Steels ◽  
Elastic And Plastic Deformation

TRIP steels are prone to crack during forming process, mainly because of the transformation of retained Austenite to Martensite, causing discordance between external force and deformation. The mechanical behavior of TRIP steels has conventional elastic and plastic deformation, as well as time-dependent viscous properties. So it is necessary to consider the effect of time to their deformation behavior during constitutive model building. The rheological model used in TRIP steels is not only to reveal the soft and hard phase properties accurately and reasonably by combination of different components but also to indicate the TRIP effect during deformation process by change and combination of coefficients of components. In this paper, rheological constitutive models for TRIP600 are adopted and discussed based on rheological theory, and finally the uniform constitutive equations under creep condition and stress relaxation are built.

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