Vibration response analysis on stainless steel thin plate weldments

Macanhan, Vanessa Bawden de Paula; Corrêa, Edmilson Otoni; Lima, Antônio Marcos Gonçalves de; Silva, Jose Tadeu da

doi:10.1007/s00170-019-03297-x

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…Jubb and Philips [3] and Kaldas and Dickinson [4] identified the phenomenon empirically and calculated the frequencies analytically. However, because the theoretical analysis involves many parameters and complex calculations, more studies were developed only after FEM computer softwares became more accessible [5][6][7][8][9][10][11][12][13].…”

Section: Methodsmentioning

confidence: 99%

“…Charette [9] demonstrated through experimental and MEF studies that natural frequency values tend to return to a similar non-welded plate values after thermal treatment. Macanhan et al [13] compared bead on plate (BOP) and butt-welded experiments and observed that plates with the same materials, thicknesses and welding parameters resulted in higher modal variations in butt-welds than BOPs, due to higher thermal gradients in butt-welded plates and, consequently, higher residual stresses. In addition, BOP tests did not detect low heat inputs, which could result in an apparently proper weld in BOPs, but were insufficient for full penetration in butt welds.…”

Section: Methodsmentioning

confidence: 99%

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Optimization of FEM models for welding residual stress analysis using the modal method

2023

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Welding processes may cause undesirable residual stresses and their detection is possible using different methods. Some residual stress detection methods are destructive or semi-destructive, therefore not always applicable. Some methods are non-destructive, but complex and high cost. One possible non-destructive method to detect welding residual stresses, lower cost than the current techniques, is being studied by some researchers. This method is based in the phenomenon which a structure natural frequencies vary when welding residual stress is applied. It consists in measuring the structure natural frequencies after welding, and comparing them to natural frequency values considered ideal values obtained from finite element method simulation. However, the welding process simulation is not trivial; it implies at least four finite element analyses which can be executed in different manners. The aim of this study is to analyze which parameters can improve FE model performance for obtaining simulation results closer to experiments. In this study, five models were developed. It was observed that models using 2D shell elements generate better results than models using 3D solid elements. In addition, it was observed that the symmetry technique which can be used in plate simulations leads to significant lower computational times, but affect modal results and, in addition, do not generate natural frequency values for all vibrational modes; therefore, the symmetry technique should be avoided in this type of analysis. The birth and death technique, which simulates filler metal deposition, was also analyzed. Finally, this work proposes to use interpolation technique for the natural frequency values to evaluate the modal results variation due to welding residual stresses.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Optimization of FEM models for welding residual stress analysis using the modal method

2023

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“…The initial stiffness of the plate is affected by welding residual stresses. Macanhan et al [19] found that the natural frequencies are generally decreased after a longitudinal welding process due to increasing compressive residual stresses. Conversely, vertical welds increase the structure's natural frequencies [20].…”

Section: Introductionmentioning

confidence: 99%

Effects of Weld Heat Input on Mechanical Characteristics of Low Carbon Sheet Steels

ERUSLU,

AKBULUT,

DALMIS

2024

mech

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This study focuses on examining the variation in mechanical characteristics of low-carbon sheet steels when they are subjected to heat input from Tungsten Inert Gas (TIG) welding. The weld heat input parameters, such as welding speed and current, were controlled through the TIG welding process. A finite element analysis was performed to evaluate the couple field thermomechanical effects of the weld heat line, using the Gauss heat flux approach for thermal heat variation across the weld heat-affected zone. The numerical study yielded results for weld heat-affected deflection, residual stress, and modal analysis through the finite element model. It was found that the ductility decreased and hardness increased in the fusion zone, as a function of weld current and speed. The residual stresses and their zone of influence, as determined by weld line parameters, were found to be key factors affecting deflection and natural frequencies in structural aspects of low carbon sheet steels.

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“…Experience and repeated measurement are the main means in traditional structural modification of the robot, which greatly slows down the design speed, increases the design cost, and it is difficult to achieve the optimal design quality. Using FEM in modal analysis [7][8] has important reference value for the dynamic performance, for example, the stiffness [9][10][11] , which is really essential to evaluate structural design and improve design in time.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Analysis of Two-Beam Laser Welding Robot for Fulselage Panels

Zeng

Liu

et al. 2021

Preprint

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Industrial robotics is becoming increasingly popular in the field of manufacturing automation. Two-beam laser welding robot which is a proprietary industrial robot of great importance to improve the welding quality of stringer-skin T-shape structure. In the process of two-beam laser cooperative welding, the robot constantly adjusts its own posture, and the position and posture of each joint would change simultaneously, which leads to the change of the natural frequency, and other dynamic characteristics of the welding robot. Based on the finite element method (FEM), the modal analysis of the robot joints in the range of motion ability and the range of motion in the process of two beam laser welding are studied, which can provide the basis for the design and accurate control of the robot with high degree of freedom (DOF). The dynamic characteristics of the whole robot in different positions and attitudes is carried out, which includes two parts, one is importance ranking of 18 joints of the robot through orthogonal test according to the range of each joint movement. The other is obtaining a plurality of time points in one welding cycle, and performing a modal analysis of the robot at each time point on the basis of the robot joints in the range of motion during the process of two-beam laser welding, the optimal number of time nodes are attained and the test workload could be reduced. The approach described herein provides a theoretical basis for robotics design and control optimization.

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Vibration response analysis on stainless steel thin plate weldments

Cited by 10 publications

References 14 publications

Optimization of FEM models for welding residual stress analysis using the modal method

Optimization of FEM models for welding residual stress analysis using the modal method

Effects of Weld Heat Input on Mechanical Characteristics of Low Carbon Sheet Steels

Dynamic Characteristics Analysis of Two-Beam Laser Welding Robot for Fulselage Panels

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