Development of Welding Distortion Analysis Method Using Residual Strain as Boundary Condition

2008 ◽  
Vol 580-582 ◽  
pp. 649-654 ◽  
Author(s):  
Yun Sok Ha ◽  
Si Hoon Cho ◽  
Tae Won Jang
Keyword(s):  
Boundary Condition ◽  
Boundary Conditions ◽  
Residual Strain ◽  
The Other ◽  
Welding Distortion ◽  
Thermal Distortion ◽  
Analysis Method ◽  
Distortion Analysis ◽  
Direct Input ◽  
Inherent Strain

There are two ways of conventional thermal distortion analysis. One is thermal elastoplastic analysis and the other is equivalent forces method based on inherent strain. The former needs exorbitant analysis time, while the latter cannot obtain stress results and requires more time with loads modeling on curved plates. To solve those time-consuming problems, a new kind of thermal distortion analysis method was developed. In this method, inherent strains are devised to be used as direct input factors as boundary conditions. Suggested analysis method was already adopted at welding distortion analysis of large hull block, which was considered as impossible.

scholarly journals Development of Thermal Distortion Analysis Method Based on Inherent Strain for TMCP Steels

2008 ◽  
Vol 26 (3) ◽  
pp. 61-66
Author(s):  
Yun-Sok Ha ◽  
Jin-Hyuk Yang ◽  
Seok-Hee Won ◽  
Myung-Su Yi
Keyword(s):  
Thermal Distortion ◽  
Analysis Method ◽  
Distortion Analysis ◽  
Inherent Strain

scholarly journals Predicting Welding Distortion in a Panel Structure with Longitudinal Stiffeners Using Inherent Deformations Obtained by Inverse Analysis Method

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Wei Liang ◽  
Hidekazu Murakawa
Keyword(s):  
Inverse Analysis ◽  
Welding Process ◽  
Strain Theory ◽  
The Other ◽  
Welding Distortion ◽  
Welding Deformation ◽  
Welded Structures ◽  
Longitudinal Stiffeners ◽  
Manufacturing Accuracy ◽  
Inherent Strain

Welding-induced deformation not only negatively affects dimension accuracy but also degrades the performance of product. If welding deformation can be accurately predicted beforehand, the predictions will be helpful for finding effective methods to improve manufacturing accuracy. Till now, there are two kinds of finite element method (FEM) which can be used to simulate welding deformation. One is the thermal elastic plastic FEM and the other is elastic FEM based on inherent strain theory. The former only can be used to calculate welding deformation for small or medium scale welded structures due to the limitation of computing speed. On the other hand, the latter is an effective method to estimate the total welding distortion for large and complex welded structures even though it neglects the detailed welding process. When the elastic FEM is used to calculate the welding-induced deformation for a large structure, the inherent deformations in each typical joint should be obtained beforehand. In this paper, a new method based on inverse analysis was proposed to obtain the inherent deformations for weld joints. Through introducing the inherent deformations obtained by the proposed method into the elastic FEM based on inherent strain theory, we predicted the welding deformation of a panel structure with two longitudinal stiffeners. In addition, experiments were carried out to verify the simulation results.

scholarly journals Properties of RG interfaces for 2D boundary flows

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Anatoly Konechny
Keyword(s):  
Boundary Condition ◽  
Fixed Point ◽  
Variational Method ◽  
Boundary Conditions ◽  
The Other ◽  
Two Dimensional ◽  
Conformal Boundary ◽  
First Approximation ◽  
Local Operators

Abstract We consider RG interfaces for boundary RG flows in two-dimensional QFTs. Such interfaces are particular boundary condition changing operators linking the UV and IR conformal boundary conditions. We refer to them as RG operators. In this paper we study their general properties putting forward a number of conjectures. We conjecture that an RG operator is always a conformal primary such that the OPE of this operator with its conjugate must contain the perturbing UV operator when taken in one order and the leading irrelevant operator (when it exists) along which the flow enters the IR fixed point, when taken in the other order. We support our conjectures by perturbative calculations for flows between nearby fixed points, by a non-perturbative variational method inspired by the variational method proposed by J. Cardy for massive RG flows, and by numerical results obtained using boundary TCSA. The variational method has a merit of its own as it can be used as a first approximation in charting the global structure of the space of boundary RG flows. We also discuss the role of the RG operators in the transport of states and local operators. Some of our considerations can be generalised to two-dimensional bulk flows, clarifying some conceptual issues related to the RG interface put forward by D. Gaiotto for bulk 𝜙1,3 flows.

Analysis of a Fixed-Guided Compliant Beam With an Inflection Point Using the Pseudo-Rigid-Body Model Concept

2015 ◽  
Vol 7 (3) ◽  
Author(s):  
Ashok Midha ◽  
Sushrut G. Bapat ◽  
Adarsh Mavanthoor ◽  
Vivekananda Chinta
Keyword(s):  
Boundary Condition ◽  
Boundary Conditions ◽  
Rigid Body ◽  
Inflection Point ◽  
Compliant Mechanism ◽  
Analysis Method ◽  
Model Concept ◽  
Displacement Boundary ◽  
Rigid Body Model ◽  
Selection Of

This paper provides an efficient method of analysis for a fixed-guided compliant beam with an inflection point, subjected to beam end load or displacement boundary conditions, or a combination thereof. To enable this, such a beam is modeled as a pair of well-established pseudo-rigid-body models (PRBMs) for fixed-free compliant beam segments. The analysis procedure relies on the properties of inflection in developing the necessary set of parametric, static equilibrium and compatibility equations for solution. The paper further discusses the multiplicity of possible solutions, including displacement configurations, for any two specified beam end displacement boundary conditions, depending on the locations and types of the effecting loads on the beam to meet these boundary conditions. A unique solution may exist when a third beam end displacement boundary condition is specified; however, this selection is not unconditional. A concept of characteristic deflection domain is proposed to assist with the selection of the third boundary condition to yield a realistic solution. The analysis method is also used to synthesize a simple, fully compliant mechanism utilizing the fixed-guided compliant segments.

scholarly journals Welding Distortion Analysis of Hull Blocks using Equivalent Load Method Based on Inherent Strain

2012 ◽  
Vol 56 (2) ◽  
pp. 63-70 ◽  
Author(s):  
Yong Tai Kim ◽  
Tae Jun Kim ◽  
Tae Yoon Park ◽  
Chang Doo Jang
Keyword(s):  
Welding Distortion ◽  
Distortion Analysis ◽  
Equivalent Load Method ◽  
Equivalent Load ◽  
Inherent Strain

Finite Element Analysis of Slider in High-Speed Horizontal NC Center

2011 ◽  
Vol 225-226 ◽  
pp. 43-46 ◽  
Author(s):  
Ming Cong ◽  
Tao Han ◽  
Qiang Zhao ◽  
Tie Jun Lan ◽  
Xiu Yong Ju
Keyword(s):  
Boundary Condition ◽  
Finite Element ◽  
High Speed ◽  
Simulation Analysis ◽  
The Other ◽  
Analysis Method ◽  
Great Role ◽  
Original Design ◽  
Element Analysis ◽  
Element Simulation

Slider is one of the most important parts in High-Speed Horizontal Machining NC center, it plays a great role in the performance of static and dynamic. In order to assure the working accuracy and dynamic characters, slider must be analyzed to verify the reasonable of original design. According to the structure of slider and based on the theoretical and finite element simulation analysis method, a more reasonable boundary condition is carried out. To be noted that in this paper a method using the conception of combination is introduced. On the other hand the counterforce can be more accurate than before and it makes the following analysis easier.

Comparison of Sewage Treatment Mixer in Three Pool Face Boundary Conditions

2013 ◽  
Vol 457-458 ◽  
pp. 979-983
Author(s):  
Fei Tian ◽  
Wei Dong Shi ◽  
Hua Jiang
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Boundary Conditions ◽  
Fluid Velocity ◽  
Sewage Treatment ◽  
The Other ◽  
Actual Situation ◽  
Pool Surface ◽  
First Case ◽  
Vof Model

The method for setting the boundary condition of the pool surface was studied. Using the FLUENT 6.3 CFD software,the RNG k-ε turbulence model and SI MPLE algorithm,the sewage treatment pool where a submersible mixer with two leaves was numerically simulated by describing the surface as wall,VOF model and rigid-lid assumption respectively. Meanwhile, the velocity distribution in the pool was analyzed. The results showed that: the contribution of the three different treatments to the flow in the pool are small except the area near the pool surface. In the first case ( describe the surface as wall), pool surface fluid velocity is zero, which is inconsistent with the actual situation obviously. In the other two cases (describe the surface as VOF model and rigid-lid assumption), the pool surface fluid velocity has the same velocity and is not zero,which is consistent with the actual situation. In the case of rigid-lid assumption,convergence was reached easily,and it is undemanding for the computer configuration,so it ( rigid-lid assumption) is the best boundary conditions setting method for the surface and provides guidance for the mixer numerical simulation.

Sign in / Sign up

Export Citation Format

Share Document