Idealized Methods for Nonlinear Welding Mechanics

2016 ◽  
Author(s):  
Hidekazu Murakawa
Keyword(s):  
Large Scale ◽  
Engineering Problem ◽  
Welding Distortion ◽  
Powerful Method ◽  
Deformation Method ◽  
Large Structures ◽  
Computational Welding Mechanics ◽  
Practical Engineering ◽  
Inherent Deformation ◽  
Practical Engineering Problem

Computational Welding Mechanics is established by Prof. Yukio Ueda and it has become an indispensable and powerful method for understanding complex mechanical phenomena in welding. To tackle practical engineering problem, large scale transient nonlinear problem must be solved. For this, various “Idealized Methods” for welding mechanics were proposed. Among them, Iterative Substructure Method for transient nonlinear welding problem and Inherent Deformation Method for prediction of welding distortion of large structures are presented together with their application to practical problems.

Contact Stress Analysis of Gear of Crane Gearbox

2007 ◽  
Author(s):  
Zhonglai Wang ◽  
Bo Yang ◽  
Hong-Zhong Huang ◽  
Qiang Miao ◽  
Dan Ling
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Contact Stress ◽  
Optimization Method ◽  
Probability Of Failure ◽  
Engineering Problem ◽  
Gear Transmission ◽  
Practical Engineering ◽  
Practical Engineering Problem

Gears are widely used in many practical engineering to transmit torque. In the process of meshing, contact stress will be produced which causes pitting. Shock becomes more and more serious with the increase of pitting and the probability of failure of meshing gears increases. Contact stress analysis is necessary and important to increase the reliability of gear transmission. In this paper, a fuzzy Hertz approximate optimization method and finite element method are used to deal with a practical engineering problem.

Meso-Scale Oriented Physical Simulation Model for Complex Product Maintenance in Virtual Environment

2013 ◽  
Vol 706-708 ◽  
pp. 1954-1957
Author(s):  
Gao Liang Peng ◽  
Hong Liang ◽  
Xin Li
Keyword(s):  
Physical Simulation ◽  
Significant Loss ◽  
Engineering Problem ◽  
Large Component ◽  
Operation Process ◽  
Simulation Strategy ◽  
Practical Engineering ◽  
Surface Visualization ◽  
Practical Engineering Problem ◽  
Important Significance

Large component disassembly is complex tasks, the collision during the operation process often cause component damage and deform, even bring safe accident and result in significant loss. This paper proposes to use Meso-dimential oriented physical simulation strategy to research the collision effect simulation and damage surface visualization of large component during disassembly operation. Meso-collide behavior of multi-particles is adapted to simulate the macro-collision of large component. The method has important significance for expanding the mechanical simulation theory and solving the complex practical engineering problem.

Computational Welding Mechanics and Concept of Inherent Strain for Industrial Applications

2007 ◽  
Vol 539-543 ◽  
pp. 181-186 ◽  
Author(s):  
Hidekazu Murakawa
Keyword(s):  
Residual Stress ◽  
Theoretical Prediction ◽  
Industrial Applications ◽  
Computational Method ◽  
Welding Distortion ◽  
Industrial Structures ◽  
Computational Welding Mechanics ◽  
Inherent Deformation ◽  
Inherent Strain

The distortion and the residual stress are the inevitable consequences of the welding and these may reduce the strength and the quality of the welded structures. To prevent the harmful influence of the welding distortion and the residual stress, their theoretical prediction is necessary. However the existing methods are mostly developed for the study of specimens in laboratories. Compared to the specimens, the structures manufactured in the industry are larger in size and more complex in geometry. For the theoretical prediction applicable to industrial structures, more powerful and practical methods are necessary. To achieve this goal, the authors developed a fast computational method for thermal elastic plastic analysis and an elastic finite element method using inherent deformation.

TOP JOINT STUDY ON TEMPERATURE STRESS FOR SUPER-LONG SLAB-COLUMN STRUCTURE

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5643-5648
Author(s):  
MINGHAI DONG ◽  
LI SONG ◽  
YING SHAO
Keyword(s):  
Temperature Stress ◽  
Temperature Difference ◽  
Engineering Problem ◽  
Column Structure ◽  
Practical Engineering ◽  
Stress And Deformation ◽  
Bottom To Top ◽  
Practical Engineering Problem ◽  
Joint Method ◽  
Temperature Crack

In this paper, top joint method is proposed to solve a practical engineering problem of temperature stress and temperature crack of super-long slab-column structure bearing temperature difference. From the study, it is shown that as for super-long slab-column structure undergoing temperature difference of inside and outside, joint located in bottom stories nearly has no influence on temperature stress and deformation while joint in top stories can significantly reduce temperature stress and deformation of super-long slab-column structures. In addition, comparison of joints located in top one story, top several stories and from bottom to top stories indicates that influences of them on temperature stress and deformation are similar. As for top joint method, among which cantilever plate method, double column method and corbel method are discussed and results indicate that influence effects of these methods on structures are similar.

Nonlinear Computational Welding Mechanics for Large Structures

2016 ◽  
Author(s):  
Kazuki Ikushima ◽  
Masakazu Shibahara
Keyword(s):  
Thin Plate ◽  
Degrees Of Freedom ◽  
Large Scale ◽  
Computing Time ◽  
Ship Hull ◽  
Welding Deformation ◽  
Work Time ◽  
Plate Structures ◽  
Large Structures ◽  
Computational Welding Mechanics

Large-scale thin-plate structures including ships are constructed by welding, and distortion can occur after welding. Welding deformation can increase cost and work time, and so it is important to investigate welding deformation before construction. In this research, to predict welding deformation on the construction of a large thin-plate structure, Idealized Explicit FEM (IEFEM) was applied to the analysis of welding deformation on the construction of a ship hull block. In addition, to efficiently analyze deformation of the whole structure of a large-scale structure, an algebraic multigrid (AMG) method was introduced into the IEFEM. Then, this multigrid IEFEM (MGIEFEM) was applied to the analysis of welding deformation on the construction of a ship hull block. The ship hull block consisted of 10 million degrees of freedom and the MGIEFEM analysis was finished within the practical computing time of a week. Thus, it can be said that MGIEFEM is an effective tool for analyzing the welding deformation of real products.

scholarly journals Fuzzy Reliability Theory Based on Membership Function

2016 ◽  
Vol 1 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Shshank Chaube ◽  
S. B. Singh
Keyword(s):  
Membership Function ◽  
Real Life ◽  
Reliability Theory ◽  
Engineering Problem ◽  
Point Of View ◽  
Fuzzy Reliability ◽  
Reliability Parameters ◽  
Problem Method ◽  
Practical Engineering ◽  
Practical Engineering Problem

In this study, it is considered that the shape of membership function and the values of parameters are arbitrary, hence reliability parameters will be arbitrary, and some data are even absurd from the point of view of real life practice. An applied fuzzy reliability theory is applied to practical engineering problem. Method of fuzzy reliability evaluation are developed.

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