Characterisation of actual weld geometry and stress concentration of butt welds exhibiting local undercuts

2021 ◽  
Vol 240 ◽  
pp. 112266
Author(s):  
M.J. Ottersböck ◽  
M. Leitner ◽  
M. Stoschka
Keyword(s):  
Stress Concentration ◽  
Butt Welds ◽  
Weld Geometry

Finite Element Modeling and Analysis of Orthotropic Butt Welds

2010 ◽  
Author(s):  
Masoud Mojtahed ◽  
Qingtian Cai
Keyword(s):  
Finite Element ◽  
Stress Intensity ◽  
Static Loads ◽  
Butt Weld ◽  
Butt Welds ◽  
Modeling And Analysis ◽  
Weld Geometry ◽  
Design Engineers ◽  
The Relationship ◽  
Orthotropic Behavior

Butt welds with orthotropic behavior are widely applied in mechanical and structural designs. Since welds cannot always be perfect in practice, it is important to understand the weld’s stress behavior under different imperfect geometries. In this paper research has been performed to investigate the relationship between stress intensity factors and change of geometry of orthotropic butt welds. Finite element methods were applied to simulate weld geometries. The simulation was performed using ANSYS software assuming two beams are welded together with a discontinuity at the bottom of the weld. The combined beams and the butt weld are then considered to be one piece of glued structure. The discontinuity in the structure is used to model a crack and lack of weld penetration. By changing three important factors of the weld geometry under uniform axial static loads, the trend of stress intensity factor behavior versus change of geometry has been investigated. Both single and double sided butt welds were considered in this paper. The results of this investigation will be a helpful tool for design engineers in deciding the best weld geometry in applications.

Stress Concentration Factors for Butt Welds in Plated Structures

2014 ◽  
Author(s):  
Inge Lotsberg ◽  
Harald Rove
Keyword(s):  
Stress Concentration ◽  
Stiffened Plates ◽  
Element Analysis ◽  
Butt Weld ◽  
Butt Welds ◽  
Longitudinal Stiffener ◽  
Longitudinal Stiffeners ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Relevant Range

Geometric stress concentration factors for butt welds in stiffened plates have been investigated by finite element analysis. The purpose of these analyses has been to establish a data basis that can be used to develop an analytical expression for stress concentration factors (SCF) for butt welds in stiffened plates. The geometry investigated is that typical used in stiffened plates in floating production vessels and ships. The geometry is also considered to be in the relevant range for semisubmersibles. Stress concentration factors are derived at the butt weld in the midway between the longitudinal stiffeners and at butt welds in way of cope holes of the longitudinal stiffener. Based on the performed work an equation accounting for eccentricity of plates due to fabrication tolerances and difference in thickness is derived that also has been included in the DNV Recommended Practice for fatigue analysis.

A New Type of Precision Tire

1988 ◽  
Vol 16 (4) ◽  
pp. 200-207
Author(s):  
O. B. Tretyakov
Keyword(s):  
Stress Concentration ◽  
Failure Rates ◽  
Stress Strain ◽  
Radial Tire ◽  
Resonance Effects ◽  
Precision Stage ◽  
New Type ◽  
Degree Of Order

Abstract A process is suggested for improving the rubber-cord composite in a radial tire through precision stage-by-stage molding of its parts. This starts by casting an inner elastomeric envelope of the carcass from a liquid oligomer mix. The full molding technology uses acoustic and resonance effects to optimize the degree of order of the structure and of rubber uniformity. The resultant precision tires should have a higher degree of order of both macro- and microstructure than do present commercial tires. Reduced stress concentration in locations that have high failure rates in commercial tires are considered. A new theory, CSSOT, is used for optimizing tires from results of stress-strain cycles.

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