Thermomechanical analysis applied to the laser beam welding simulation of aeronautical structures

2004 ◽  
Vol 120 ◽  
pp. 785-792
Author(s):  
C. Darcourt ◽  
J. M. Roelandt ◽  
M. Rachik ◽  
D. Deloison ◽  
B. Journet
Keyword(s):  
Finite Element ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Three Dimensional ◽  
Welding Process ◽  
Experimental Tests ◽  
Thermomechanical Analysis ◽  
Stiffened Panels ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The present work is being done in the framework of a national program about the lightening of aeronautical structures and describes a three-dimensional finite element simulation of the laser beam welding process. The targeted aeronautical structures are stiffened panels in aluminum alloys, which tend to replace riveted assemblies. Semi-coupled thermomechanical finite element analyses have been carried out to evaluate the magnitude and distribution of welding-induced residual stresses in order to take them into account for fatigue sizing. The finite element code MSC.Marc is used for the different calculations. Specific welding features have been added to the code through the implementation of a moving heat source or an elastoviscoplastic law. Experimental tests have been carried out in order to provide mechanical and thermal databases to the model. Monitored experimental welding have been made for comparisons with the simulation. In particular, results of thermocouple measurements have permitted to improve the thermal model.

Frictional Analysis of MoS2 Coated Ball Bearings: A Three-Dimensional Finite Element Analysis

1997 ◽  
Vol 119 (4) ◽  
pp. 754-763 ◽  
Author(s):  
M. R. Lovell ◽  
M. M. Khonsari ◽  
R. D. Marangoni
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Element Model ◽  
Hertzian Contact ◽  
Contact Theory ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Hertzian Contact Theory

A brief review of finite element contact and friction theory is presented for low-speed bearing operations. A three-dimensional finite element model is developed to realistically characterize the friction experienced by a coated ball bearing element. The finite elements results, which are obtained for various normal loads and ball materials, are verified using Hertzian contact theory and previous experimental tests performed by the authors. From the results, general trends for the frictional behavior of coated bearing surfaces are established and implications to the field of controls, as applied to precision positioning and tracking instruments are discussed.

Utilization of Splice Skew Joint with Key on Reconstruction of Historical Trusses

2013 ◽  
Vol 688 ◽  
pp. 207-212 ◽  
Author(s):  
Karel Šobra ◽  
Petr Fajman
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Mechanical Behaviour ◽  
Three Dimensional ◽  
Joint Stiffness ◽  
Experimental Tests ◽  
Element Model ◽  
Numerical Results ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

Currently, for reconstruction of historical trusses traditional carpentry joints are used. For many years these joints are constructed in the same way. Unfortunately, the mechanical behaviour of these joints and influence of their parts and geometry of joints to the joint stiffness are not well known. To improve these joints, it is necessary to know their behaviour. This paper describes a study recently completed on the vertical splice skew joint with a key. Experimental tests were performed and compared to the numerical results of three-dimensional finite element model created using ATENA 3D.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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