scholarly journals Modified Equivalent Load Method for Welding Distortion Analysis

2020 ◽  
Vol 8 (10) ◽  
pp. 794
Author(s):  
Jaemin Lee ◽  
Hyun Chung
Keyword(s):  
Shell Element ◽  
Angular Distortion ◽  
Computational Time ◽  
Welding Distortion ◽  
Distortion Analysis ◽  
Equivalent Load Method ◽  
Inherent Deformation ◽  
Longitudinal Bending ◽  
Equivalent Load ◽  
Improved Accuracy

In this study, modified equivalent load method for welding distortion analysis is suggested to improve its accuracy. To avoid the excessive computational time for welding distortion analysis of large welded structures, shell element-based elastic analysis methods are widely used, applying the inherent deformation approach. Equivalent nodal forces are commonly used in common FE (Finite Element) codes to enter these inherent deformation values. However, the conventional method cannot estimate precise longitudinal bending following the conventional equation. In this study, the problem of the existing equivalent load method is analyzed by a case study, and the modified equivalent load method that can estimate angular distortion, transverse shrinkage, and longitudinal bending is presented based on the FEM principle. The results show that by applying the proposed method, the shell element-based elastic FE approach for the welding distortion analysis can be achieved with improved accuracy.

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

Prediction of weld-induced distortion of large structure using equivalent load technique

2016 ◽  
Vol 232 (3) ◽  
pp. 499-512 ◽  
Author(s):  
Arpan Kumar Mondal ◽  
Anche Lohit ◽  
Pankaj Biswas ◽  
Swarup Bag ◽  
Manas Das
Keyword(s):  
Welding Process ◽  
Residual Deformation ◽  
Computation Time ◽  
Mechanical Analysis ◽  
Angular Distortion ◽  
Computational Time ◽  
Large Structure ◽  
Welded Structure ◽  
Weld Structure ◽  
Equivalent Load

Angular distortion in fusion welded joints is an alarming issue which affects the stability and life of the welded structures, occurs due to the changes in the temperature gradient during the welding process. This degrades the dimensional quality of a large structure during assembly which leads to rework the products and hence decreases the productivity. Predicting the weld-induced residual deformation before the production saves the valuable time and resources for rework. The conventional coupled transient, nonlinear, elasto-plastic thermo-mechanical analysis involves huge computational time. Computing a weld sample of small size with single pass itself takes several hours, which will be a huge amount of time in case of large structures consisting of several welding passes; thus, there is a real need of an efficient alternative technique to predict the post-weld distortions. In this work, an attempt has been made to determine the deformation in a submerged arc welded structure using equivalent load technique which reduces the total analysis time by one-third of the conventional techniques in case of a small weld structure. In this proposed method, the transient nonlinear elasto-plastic structural analysis part which is the major time-consuming part of analysis has been almost eliminated. So, this method can effectively use to predict the weld-induced distortion of very large structure with a computation time almost equal to the time required for transient thermal analysis of a small weld structure only. It is not feasible to analyze such a large welded structure with conventional coupled transient, elasto-plastic, nonlinear thermo-mechanical analysis. The predicted results of distortions have been validated with the experimental as well as published results and good agreements have been found.

Distortion Analysis of Welded Stiffeners

2001 ◽  
Vol 17 (04) ◽  
pp. 226-240 ◽  
Author(s):  
O. A. Vanli ◽  
P. Michaleris
Keyword(s):  
Residual Stress ◽  
Heat Input ◽  
Welding Process ◽  
Angular Distortion ◽  
Welding Distortion ◽  
Two Dimensional ◽  
Buckling Mode ◽  
Buckling Stress ◽  
Distortion Analysis ◽  
Process Simulations

This paper presents a welding distortion analysis approach for T-stiffeners with a particular emphasis on welding-induced buckling instabilities. Two-dimensional thermomechanical welding process simulations are performed to determine the residual stress and angular distortion. This critical buckling stress along with the buckling mode and bowing distortion are computed in 3-D eigenvalue and linear stress analyses. The effects of the stiffener geometry, weld sequence, weld heat input and mechanical fixturing on the occurrence of buckling and the distortion pattern are investigated.

scholarly journals Hybrid Method for Detecting Duplicate Image by Using Image Retrieval Technique in Data Mining

2021 ◽  
Vol 09 (04) ◽  
Author(s):  
Dr. S. Thavamani ◽  
Keyword(s):  
Data Mining ◽  
Image Retrieval ◽  
Hybrid Method ◽  
Video Retrieval ◽  
New Method ◽  
Computational Time ◽  
Storage Space ◽  
Copy Detection ◽  
Retrieval Technique ◽  
Improved Accuracy

Duplicated images cause several problems in online sites, so these demand special attention. To address the disadvantages of frames copy detection, the Hybrid Method of Detecting Duplicate Image by Using Image Retrieval Technique in Data Mining was proposed. We use the new method of eliminating duplicates in this example. To address the disadvantages of frames copy detection, the Hybrid Method of Detecting Duplicate Image by Using Image Retrieval Technique in Data Mining was proposed. The new method of eliminating duplicates in this example has proposed. Using this method, you can get rid of frames that aren't relevant to the video. This makes for more precise and faster video retrieval with fewer duplicates. As a back end, this technique is implemented in C# and SQL. The findings are put to the test and compared to the current SIFT process. The results showed that the output improved accuracy while reducing storage space, computational time, and memory use.

Anchor Spacing Design of Pre-Stressed Tunnel Concrete Lining with Un-Bonded Annular Anchors for Songhua River Water Supply Project

2017 ◽  
Vol 737 ◽  
pp. 505-510 ◽  
Author(s):  
Jin Pi ◽  
Yu Fei Zhao ◽  
Rui Lang Cao ◽  
Zhi Xin Jia
Keyword(s):  
Water Supply ◽  
River Water ◽  
Design Method ◽  
Water Pressure ◽  
Poor Quality ◽  
Concrete Lining ◽  
Songhua River ◽  
Equivalent Load Method ◽  
Equivalent Load ◽  
The Cost

At present, annular anchor pre-stressed tunnel Concrete lining is the main design method of poor -quality surrounding rocks, thin covering and high internal water pressure tunnel. Based on the contact of tendons and concrete, the annular anchor lining can be classified into bonded and un-bonded. Cable spacing is one of the key parameters in the design of the un-bonded annular anchors pre-stressed concrete lining. The optimal anchor spacing can not only meet the demand of the project, but also save the cost of construction. In this paper, the anchor spacing is studied in the design of pre-stressed tunnel concrete lining with un-bonded annular anchors for Songhua River water supply project. The equivalent load method and solid modeling method are combined in Flac3d 3D modeling. Numerical simulation of pre-stressed effects for different anchor spacing in tension and operation of the concrete lining were analyzed. The optimal anchor cable spacing is received, which is a reference for the design and construction of similar projects in the future.

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