Three-dimensional singularity index at interface corner in prismatic butt joint under arbitrary material combination

2021 ◽  
pp. 111120
Author(s):  
Tatsujiro Miyazaki ◽  
Takahiro Fujiwara ◽  
Nao-Aki Noda ◽  
Yoshikazu Sano
Keyword(s):  
Three Dimensional ◽  
Butt Joint ◽  
Material Combination ◽  
Singularity Index

Prediction of Residual Stresses and Buckling Distortion in Welding of a Thin Wall Aluminum Butt Joint

2006 ◽  
Author(s):  
Sanaz Yazdanparast ◽  
Mohsen Asle Zaeem ◽  
Iraj Rajabi
Keyword(s):  
Residual Stresses ◽  
Structural Model ◽  
Flow Analysis ◽  
Three Dimensional ◽  
Butt Joint ◽  
Thin Wall ◽  
Global Buckling ◽  
Motion Speed ◽  
Stress And Deformation ◽  
Buckling Distortion

In this paper, global welding buckling distortion of a thin wall aluminum butt joint is investigated. To determine longitudinal residual stresses, a thermo-elastoplastic model is employed; analysis of thermal model and elastic-viscoplastic (Anand) model are decoupled. By using birth and death element method and time dependent model, molten puddle motion (speed of welding) is modeled. Three dimensional nonlinear-transient heat flow analysis has been used to obtain temperature distribution. By applying thermal results and using three dimensional Anand elastic-viscoplastic model, stress and deformation distributions are obtained. Residual stresses are applied on a structural model and by using eigenvalue methods, global buckling instability of butt welded joint is determined. The result of buckling investigation in the numerical model is compared with the result of an experiment.

Intensity of Singular Stress Field for Three-Dimensional Butt Joint to Evaluate the Adhesive Strength

2018 ◽  
Vol 2018.71 (0) ◽  
pp. D31
Author(s):  
Mohd Radzi ARIDI ◽  
Nao-Aki NODA ◽  
Kenji TSUBOI ◽  
Rei TAKAKI ◽  
Fei REN ◽  
...  
Keyword(s):  
Stress Field ◽  
Adhesive Strength ◽  
Three Dimensional ◽  
Butt Joint ◽  
Singular Stress ◽  
Singular Stress Field

Mixed Finite Element Analysis of Elastomeric Butt-Joints

2005 ◽  
Vol 129 (1) ◽  
pp. 11-18 ◽  
Author(s):  
P. A. Kakavas ◽  
G. I. Giannopoulos ◽  
N. K. Anifantis
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Poisson Ratio ◽  
Mixed Finite Element ◽  
Three Dimensional ◽  
Butt Joint ◽  
Element Formulation ◽  
Butt Joints ◽  
Element Analysis ◽  
Strain Energy Density Function

This paper presents a mixed finite element formulation approximating large deformations observed in the analysis of elastomeric butt-joints. The rubber has been considered as nearly incompressible continuum obeying the Mooney/Rivlin (M/R) strain energy density function. The parameters of the model were determined by fitting the available from the literature uniaxial tension experimental data with the constitutive equation derived from the M/R model. The optimum value of the Poisson ratio is adjusted by comparing the experimentally observed diametral contraction of the model with that numerically obtained using the finite element method. The solution of the problem has been obtained utilizing the mixed finite element procedure on the basis of displacement/pressure mixed interpolation and enhanced strain energy mixed formulation. For comparison purposes, an axisymmetric with two-parameter M/R model and a three-dimensional (3D) with nine-parameters M/R model of the butt-joint are formulated and numerical results are illustrated concerning axisymmetric or general loading. For small strains the stress and/or strain distribution in the 2D axisymmetric butt-joint problem was compared with derived analytical solutions. Stress distributions along critical paths are evaluated and discussed.

Viscoplastic Analysis of Adhesive Joints

1996 ◽  
Vol 63 (1) ◽  
pp. 21-26 ◽  
Author(s):  
G. K. Hu ◽  
F. Schmit ◽  
D. Baptiste ◽  
D. Franc¸ois
Keyword(s):  
Hydrostatic Stress ◽  
Three Dimensional ◽  
Constant Strain Rate ◽  
Adhesive Layer ◽  
Butt Joint ◽  
Lap Joints ◽  
Experimental Results ◽  
Constitutive Law ◽  
Tensile Creep ◽  
Account Due

The uniaxial constitutive law for an adhesive is studied by constant strain rate tensile, creep and relaxation tests. The S-D effect of the adhesive is taken into account by using the Raghava yielding criterion in a three dimensional constitutive formulation. The obtained constitutive law is then used to analyze a single lap joint and a butt joint by a finite element method. Constant cross head speed tensile and creep loading cases are examined. For a butt joint, the results show that the viscous effect and the influence of the hydrostatic stress must be taken into account due to the variation of the hydrostatic stress and of the loading rate in the adhesive layer as function of its thickness. A comparison with experimental results is also given. A good agreement between viscoplastic calculations and experimental results is obtained for single-lap joints. A reasonable result is obtained for butt joints and the discrepancy is attributed to interfacial debonding.

Numerical and Experimental Investigation of Pulsed Laser Welding of Hastelloy C-276 Alloy Sheets

2010 ◽  
Vol 154-155 ◽  
pp. 1468-1471 ◽  
Author(s):  
Yu Quan Guo ◽  
Dong Ming Guo ◽  
Guang Yi Ma ◽  
Dong Jiang Wu
Keyword(s):  
Finite Element ◽  
Parametric Design ◽  
Laser Beam Welding ◽  
Three Dimensional ◽  
Pulsed Laser ◽  
Element Model ◽  
Butt Joint ◽  
Heat Of Fusion ◽  
Pulsed Laser Beam Welding ◽  
Cross Section Profile

In this paper, a three-dimensional finite element model is developed to compute thermal phenomena of 0.5 mm thick Hastelloy C-276 alloy sheets during pulsed laser beam welding (PLBW). Temperature-dependent thermal properties of Hastelloy C-276 alloy, effect of latent heat of fusion, and the convective and radiative boundary conditions are taken into account in the model. The space-time temperature distributions in a butt-joint weld produced by the PLBW process are predicted from the beginning of welding to the final cooling. The heat input to the model is assumed to be a double ellipsoid heat source. The finite element calculations are performed by using ANSYS code with the parametric design capabilities. Experiments were carried out to determine the temperature evolution during welding and to measure the cross section profile of the weld bead. By comparing the simulation results with the corresponding experimental findings, it is found that they are in a good agreement. The validity and applicability of the numerical simulation model are confirmed.

The wave structure of monochromatic electromagnetic radiation

1987 ◽  
Vol 409 (1836) ◽  
pp. 21-36 ◽  
Keyword(s):  
Electromagnetic Radiation ◽  
Electromagnetic Waves ◽  
Plane Waves ◽  
Three Dimensional ◽  
Wave Structure ◽  
Single Frequency ◽  
Singularity Index ◽  
Left Handed ◽  
General Field ◽  
Structurally Stable

The paper considers a general field of electromagnetic waves of a single frequency and identifies the salient structurally stable features of the three-dimensional pattern of polarization. The approach is geometrical rather than analytical, and it differs from previous treatments of this kind by being applicable even when the constituent plane waves are travelling in all directions. Lines and surfaces exist where the electric or magnetic vibration ellipse is singular. The field is divided into right-handed and left-handed regions by ‘T surfaces’ , the electric and magnetic T surfaces not being coincident. Lying in the T surfaces are ‘L T lines’ where the vibration is linear, and cutting through the T surfaces are ‘C T lines’ where the vibration is circular. Both kinds of lines are surrounded by characteristic patterns of vibration ellipses, which provide a singularity index, ± 1 for L T and ± ½ for C T . The analysis is applicable in a cavity, but a loss-free resonating cavity represents a highly degenerate case.

The Numerical Simulation on Welding Stress Field of High Strength Steel for Axle Case Steel 390Q

2011 ◽  
Vol 239-242 ◽  
pp. 2370-2375
Author(s):  
Yan Yu ◽  
Feng Xue Wang ◽  
Jun Chen ◽  
Zhen Liu
Keyword(s):  
Stress Field ◽  
Welding Speed ◽  
Weld Zone ◽  
Three Dimensional ◽  
High Strength ◽  
Simulation Method ◽  
Butt Joint ◽  
Welding Parameters ◽  
Welding Stress ◽  
Stress Simulation

This paper takes the butt joint of axle case steel as research object, simulates the real-time three dimensional dynamics CO2 shielded welding of welding stress field by FEM software ANSYS and obtains the axle case steel 390Q’s transient stress field of weld zone at different welding speed. On that basis, the feasible dynamic simulation method of three-dimensional stress welding field which provides theoretical basis and guidelines for optimizing welding technology and norm welding parameters was proposed. The result of welding stress simulation shows that the welding stress is the lowest when the optimum welding speed is 5mm/s.

scholarly journals Colored 3D Path Extraction Based on Depth-RGB Sensor for Welding Robot Trajectory Generation

Automation ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 252-265
Author(s):  
Alfonso Gómez-Espinosa ◽  
Jesús B. Rodríguez-Suárez ◽  
Enrique Cuan-Urquizo ◽  
Jesús Arturo Escobedo Cabello ◽  
Rick L. Swenson
Keyword(s):  
New Technologies ◽  
Low Cost ◽  
Rapid Development ◽  
Color Space ◽  
Three Dimensional ◽  
3D Models ◽  
Butt Joint ◽  
Industrial Robots ◽  
Robot Trajectory ◽  
Path Extraction

The necessity for intelligent welding robots that meet the demand in real industrial production, according to the objectives of Industry 4.0, has been supported owing to the rapid development of computer vision and the use of new technologies. To improve the efficiency in weld location for industrial robots, this work focuses on trajectory extraction based on color features identification on three-dimensional surfaces acquired with a depth-RGB sensor. The system is planned to be used with a low-cost Intel RealSense D435 sensor for the reconstruction of 3D models based on stereo vision and the built-in color sensor to quickly identify the objective trajectory, since the parts to be welded are previously marked with different colors, indicating the locations of the welding trajectories to be followed. This work focuses on 3D color segmentation with which the points of the target trajectory are segmented by color thresholds in HSV color space and a spline cubic interpolation algorithm is implemented to obtain a smooth trajectory. Experimental results have shown that the RMSE error for V-type butt joint path extraction was under 1.1 mm and below 0.6 mm for a straight butt joint; in addition, the system seems to be suitable for welding beads of various shapes.

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