Investigation of laser bending parameters on the residual stress and bending angle of St-Ti bimetal using FEM and neural network

Kotobi, Mahdi; Mansouri, Hadi; Honarpisheh, Mohammad

doi:10.1016/j.optlastec.2019.03.030

Cited by 18 publications

(7 citation statements)

References 28 publications

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“…Geometric model. Since evaluating the residualstress field on the Ti6Al4V plate surface is critical for ultrasonic-rolling fatigue-strength evaluation, 35,36 the ultrasonic-rolling process was first performed in this study using the ABAQUS software. Notably, this model adopted a dynamic display-analysis step, combined with an actual spherical indenter and plate size, to satisfy the plate size.…”

Section: Finite-element Simulationmentioning

confidence: 99%

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

Jiahui

Jiayuan

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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As ultrasonic rolling mainly affects the residual stress and surface morphology of Ti6Al4V, it is of great significance to study different process parameters, such as amplitude, static pressure, time, and step length, thereby improving the performance of Ti6Al4V. However, unstable bouncing caused by the elastic relationship between the indenter and the sample is inevitable. Based on finite-element analysis and Hertz contact theory, the concept of critical damping was proposed to quickly stabilize the system. Therefore, a three-dimensional finite-element model was established using the ABAQUS software, after which the ultrasonic-rolling process was simulated by applying static pressure on the sample surface using a spring. Then, the distribution of residual stress under different amplitudes, static pressures, times, and step lengths was analyzed. Based on simulation and experimental results showed that the maximum residual stress of −689.802 MPa was obtained when the amplitude, static pressure, and time were 10 µm, 600 N, and 0.064 s, respectively. When the step length was 1/2 of the indentation width, the surface stress concentration was obvious, convex defects were large, and surface roughness Ra increased to 1.076 µm. Investigations also revealed that when the step length was 1/8, Ra decreased by 39.68% compared with that when the step length was 1/2, the thickness of the plastic-deformation layer reached 56.07 µm. When the step length was 1/10, the maximum compressive residual stress reached −888.007 MPa and Ra increased. On the basis of the abovementioned optimization parameters, the influence of step length on the properties of Ti6Al4V alloy was further explored, and direction for the strengthening process of Ti6Al4V alloy by studying the pattern of surface strengthening was presented.

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Section: Finite-element Simulationmentioning

confidence: 99%

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

Jiahui

Jiayuan

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…It was discovered that the corners of the pyramid form showed the greatest rate of thickness variation [11]. Numerous investigations have been carried out to look into bimetallic composite forming and the process variables involved [12] [13]. However, there is relatively little research available on incremental bimetallic sheet forming.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of Surface Quality in Single Point Incremental Forming of Cu-Al Composite Sheets

Pambhar,

Valaki

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Single-point incremental forming (SPIF) has been developed as a customized substitute of traditional sheet metal forming techniques. SPIF is a great method for rapidly prototyping sheet metal objects, although it faces challenges in achieving surface quality and thickness distribution. In this investigation, sheets of Cu-Al bimetallic composite were formed utilizing a hemispherical-headed tool with a variety of step depths, spindle speeds, forming speeds, layer arrangements, and lubrication types. Surface roughness and minimum thickness were evaluated as response parameters in relation to the significance of process variables. The best surface quality was attained with 0.4 mm step depth, 750 mm/min forming speed, and 1500 rpm spindle speed with liquid lubrication support for both types of layer arrangements. Layer arrangement and lubricant type were the decisive factors for the minimum thickness response parameters.

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“…Huang et al [ 17 ] experimentally investigated performance parameters of laser forming of 34CrNiMo6‐alloyed steel. Kotobi et al [ 18 ] studied the effects of laser beam parameters on the bend angle and residual stresses of St–Ti bimetal. They showed that an increase in scan speed and beam diameter significantly increased residual stress in the specimen.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis on Bending Behavior of Non‐Alloy Carbon Steel Sheets Using Laser‐Forming Process

Abedinzadeh

Sattari

Toghraie

2022

steel research int.

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Herein, the laser-forming process of nonalloy carbon steel sheets is investigated experimentally. First, it is necessary to consider how the material factor of carbon steels affects the bend angle during the laser-forming process. Therefore, bend angle results of three grades of carbon steel sheets, including St 14, CK 45, and CK 75, are studied based on the Taguchi design of the experiment. Then, the effects of process parameters, as named laser power, beam diameter, and scan rate on bend angle, are investigated for the most formable steel. The results show that the steel grade factor exhibits an obvious effect on bend angle, but the laser power and laser beam scan rate as process parameters play a more dominant role in determining the magnitude of the bend angle. Moreover, for St 14 with the highest bend angle, the scan rate has the most significant effect on the bend angle. In addition, the laser beam diameter exhibits the least significant effect on the bend angle. It can be concluded that the laser scan rate is the fastest factor to adjust and the most efficient control parameter for the bend angle.

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Investigation of laser bending parameters on the residual stress and bending angle of St-Ti bimetal using FEM and neural network

Cited by 18 publications

References 28 publications

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

Analysis of the residual stress and surface morphology of TI6AL4V using elastoplastic contact ultrasonic rolling

An Experimental Investigation of Surface Quality in Single Point Incremental Forming of Cu-Al Composite Sheets

Experimental Analysis on Bending Behavior of Non‐Alloy Carbon Steel Sheets Using Laser‐Forming Process

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