Finite Element Based Multi-Scale Ductile Failure Simulation of Full-Scale Pipes with a Circumferential Crack in a Low Carbon Steel

2014 ◽  
Vol 38 (7) ◽  
pp. 727-734 ◽  
Author(s):  
Jae-Jun Han ◽  
Kyung-Dong Bae ◽  
Yun-Jae Kim ◽  
Jong-Hyun Kim ◽  
Nak-Hyun Kim
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Ductile Failure ◽  
Full Scale ◽  
Low Carbon ◽  
Multi Scale ◽  
Failure Simulation ◽  
Circumferential Crack

FEA of Residual Stresses in Butt Welded Type Low Carbon Steel Using MMAW Technique

2011 ◽  
Vol 110-116 ◽  
pp. 2686-2692
Author(s):  
Gurinder Singh Brar ◽  
Gurdeep Singh
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Low Carbon Steel ◽  
Pressure Vessels ◽  
Transient Temperature ◽  
Low Carbon ◽  
Element Method

Welding is a reliable and efficient joining process in which the coalescence of metals is achieved by fusion. Welding is widely employed in diverse structures such as ships, aircraft, marine structures, bridges, ground vehicles, pipelines and pressure vessels. When two dissimilar plates are joined by welding process, a very complex thermal cycle is applied to the weldment, which further causes inhomogeneous plastic deformation and residual stress in and around fusion zone and heat affected zone (HAZ). Presence of residual stresses may be beneficial or harmful for the structural components depending on the nature and magnitude of residual stresses. In this study, a finite element analysis has been carried out to analyze the thermo-mechanical behaviour and effect of residual stress state in butt-welded in low carbon steel plates. A coupled thermal mechanical three dimension finite element model was developed. Finite element method based software SolidWorks Simulation, was then used to evaluate transient temperature and residual stress during butt welding of two plates. Plate thickness of 8 mm were used which are normally joined by multi-pass operation by Manual Metal Arc Welding (MMAW) process. During each pass, attained peak temperature and variation of residual stresses in plates has also been studied. The results obtained by finite element method agree well with those from X-ray diffraction method as published by Murugan et al. for the prediction of residual stresses.

Study for Rectangular Box Drawing of Segmented Variable Blank Holder Force

2009 ◽  
Vol 628-629 ◽  
pp. 523-528
Author(s):  
Xi Ning Li ◽  
Cheng Yu Jiang ◽  
Zhong Qi Wang
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Low Carbon Steel ◽  
Hydraulic Press ◽  
Penalty Function Method ◽  
Low Carbon ◽  
Blank Holder Force ◽  
Forming Process ◽  
Blank Holder ◽  
Drawing System

The sheet forming simulation of rectangular box was conducted by finite element method (FEM), the forming process experiment, further, was investigated, so as to understand the effect of the form of blank holder and the manner of blank holder force (BHF) on the complicated parts forming. In my study, a kind of low carbon steel was investigated, and its mechanical properties were obtained by simple tension tests. The outermost contour of the blank shape was determined by “one step method”. Furthermore, the finite element model was constructed by ANSYS parametric design language (APDL), which has characteristic of grid meshing by Belytschko-Tsay (BT) shell element, applying anisotropic constitutive equation of Barlat yield criterion, dealing contact by penalty function method and using adaptive mesh algorithm in the simulation process. Then the forming process simulation of rectangular box with segmented variable BHF was conducted. On the basis of analyzing the work principle and technical parameters of XP3CEF-100 hydraulic press, the rectangular box drawing system of segmented VBHF was established, which was made of hydraulic press, rectangular box drawing die of segmented blank holder, hydraulic part of blank holder and control part. Finally the low carbon steel forming tests were fulfilled by the rectangular box drawing system on the basis of the simulation result.

scholarly journals Study of the Dynamic Strain-Induced Transformation Process of a Low-Carbon Steel: Experiment and Finite Element Simulation

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Lei He ◽  
Ruijie Ruan ◽  
Chen Lin ◽  
Ting Dai ◽  
Xianjun Hu ◽  
...  
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Rolling Force ◽  
Reduction Rate ◽  
Low Carbon Steel ◽  
Rolling Process ◽  
Transformation Process ◽  
Dynamic Strain ◽  
Low Carbon ◽  
Rolling Temperatures

The microstructures and mechanical properties of a low-carbon steel, hot-rolled by a six-pass dynamic strain-induced transformation (DSIT) process, with different start rolling temperatures, are studied by combining experiments and finite element simulations. The start rolling temperatures of the last three passes are about 10°C higher and 20°C lower than theAr3temperature, for Processes 1 and 2, respectively. The results show that as the rolling process proceeds, rolling forces increase, while slab temperatures decrease. Before starting Pass 4, the temperature of the slab center is higher than that of the slab surface. During Pass 4 to Pass 6, however, the temperatures of the slab center and surface are nearly identical but fluctuate remarkably due to the large reduction rate. The simulated maximum rolling force and start rolling temperature of each pass agree reasonably with the experimental measurements. It is found that the simulated start temperatures of the slab center in the last three passes are about 5~25°C higher than theAr3temperature for Process 1, and the DSIT condition is better satisfied for Process 2. As a result, Process 2 produces finer grain sizes and higher yield strengths than Process 1.

The study of spring-back in wipe-bending processes for perforated components

2011 ◽  
Vol 225 (11) ◽  
pp. 2007-2014 ◽  
Author(s):  
M A Farsi ◽  
B Arezoo ◽  
V Alizadeh ◽  
S Mirzaee
Keyword(s):  
Finite Element ◽  
Carbon Steel ◽  
Sheet Metal ◽  
Low Carbon Steel ◽  
High Strength ◽  
Low Carbon ◽  
Low Alloy Steel ◽  
Spring Back ◽  
Bending Process ◽  
Component Material

Bending is one of the processes frequently used during manufacturing of sheet-metal components. Spring-back in bending operations is an important issue when producing precision parts. This issue becomes even more important when the component has any kind of hole on the bending surface. Such components are the focus of study in this paper. Many parameters affect spring-back in the bending process; in the present work, perforated components with an oblong cut are selected, and the influence of cut size, die radius, clearance, and component material on the value of the spring-back in a wipe-bending process are studied. Four different hole sizes, three die radii and clearance, and two different steel materials (high-strength low-alloy steel and low-carbon steel) are used in experiments and finite-element simulations. Results show these parameters have effect on the amount of spring-back in the wipe-bending process.

Numerical Analysis of Residual Stresses in V-Butt Welded Joint of Two Dissimilar Pipes

2013 ◽  
Author(s):  
Gurinder Singh Brar ◽  
Gurdeep Singh
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Carbon Steel ◽  
Residual Stresses ◽  
Filler Metal ◽  
Welded Joint ◽  
Low Carbon Steel ◽  
Stress Distributions ◽  
Low Carbon

In this paper a three-dimensional welding simulation was carried out by commercially available finite element software to predict temperature and the residual stress distributions in V-butt welded joint of two dissimilar pipes. Low carbon steel and stainless steel pipe welding is widely used in a variety of engineering applications such as oil and gas industries, nuclear and thermal power plants and chemical plants. Inelastic deformations during heat treatment are the major cause of residual stress. Heat during welding causes localized expansion as some areas cool and contract more than others. The stress variation in the weldment can be very complex and can vary between compressive and tensile stresses. The mismatching (in the weld in general) occurs due to joint geometry and plate thickness. Welding procedures and degree of restraints also influences the residual stress distributions. To understand the behavior of residual stress, two dissimilar pipes one of stainless steel and another of low carbon steel with outer diameter of 356 mm and internal diameter 240 mm were butt welded. The welding was completed in three passes. The first pass was performed by Manual TIG Welding using ER 309L as a filler metal. The remaining weld passes were welded by Manual Metal Arc Welding (MMAW) and ER 309L-16 was used as a filler metal. During each pass, attained peak temperature and variation of residual stresses and magnitude of axial stress and hoop stress in pipes has been calculated. The results obtained by finite element method agree well with those from Ultrasonic technique (UT) and Hole Drilling Strain-Gauge (HDSG) as published by Akhshik and Moharrami (2009) for the improvement in accuracy of the measurements of residual stresses.

FINITE ELEMENT ANALYSIS OF EQUIVALENT STRESS INDUCED BY SURFACE PUNCHING SEVERE DEFORMATION AIMED AT ALLOYING ON LOW-CARBON STEEL

2019 ◽  
Vol 27 (01) ◽  
pp. 1950096
Author(s):  
XIANGYANG MAO ◽  
JIANYU SUN ◽  
HONGXING WANG ◽  
XIUMING ZHAO ◽  
ZHANGZHONG WANG
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Steel ◽  
Stress Distribution ◽  
Equivalent Stress ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Element Analysis ◽  
Severe Deformation ◽  
Developed Surface

The punching severe deformation is a recently developed surface treatment that forms alloying by inducing a greater compressive equivalent stress field. Despite its proven utility, there has been little attention devoted to the accurate modeling of this process. In this work, a 3D-DEFORM finite element analysis was used to model the equivalent stress distribution induced by the punching process on a low-carbon steel surface. A majority of the controlling parameters of the process were taken into account. The effect of punching number, punching tip size, punching velocity and punching pressure on the equivalent stress distribution was evaluated. The results show that an equivalent stress distribution much higher than the conventional surface severe deformation can be obtained by optimizing the punching severe deformation process. The reported simulation results can successfully predict the punching severe deformation used to create an alloying layer on the surface of low-carbon steel.

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