A novel approach of residual stress prediction in ST-14/ST-44 laser welded blanks; mechanical characterization and experimental validation

Aminzadeh, Ahmad; Karganroudi, Sasan Sattarpanah; Barka, Noureddine

doi:10.1016/j.matlet.2020.129193

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…A classical parameter study would allow the evaluation based on the Taguchi method or the classical design of experiment approach. 23–25 However, since the main parameter is a different manufacturer, it would be quite difficult to evaluate some meaningful trends. Thus, we decided to present our main findings in the form of bar charts and some typical photographic illustrations.…”

Section: Methodologiesmentioning

confidence: 99%

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

Riegraf

Öchsner

Greuling

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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Customer expectations are increasing, especially with regard to the individualization of products, in which additive manufacturing is described as a disruptive technology. With a view to using the technology in a series application, extensive knowledge of the starting material, the powder, is necessary. In this article, AlSi10Mg in powder form (grain size range: 15–70 µm), which is used for the selective laser melting process, is analysed on the basis of various investigations. A distinction is made from other researchers, as a total of six powders of the same specification but from different manufacturers were used. An investigation of the relative humidity of the powders in the as-delivered condition was carried out using a moisture meter. It could be shown that the moisture lies between 5% and 15% and that the moisture can be reduced by about half by using dry bags. A qualitative examination with a scanning electron microscopy showed that the morphology and size distribution differ. Not only partially round, but also very misshapen particles and particles with and without adhesions are present. The flowability was determined with a calibrated Hall flowmeter. It was found that a lower proportion of fine particles in the powder lead to a more uniform flowability. In the investigation, a distinction was made between powder in the as-received state and dried powder. The particle size distribution was determined with a laser diffraction method and evaluated according to the Mie theory. To be able to carry out porosity analyses on the basis of micrographs, test cubes with the dimensions (10 × 10 × 10 mm3) were used. The parameters scanning speed (400–600 mm/s), hatch spacing (0.19–0.29 mm), and laser power (220–320 W) were varied. The results vary between 0.12% and 5.46% porosity. To combine the results, a pairwise comparison and a use-value analysis were carried out. Overall, the differences in the powders of the different manufacturers were found to be small, so that a recommendation was made for the most economical powder.

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Section: Methodologiesmentioning

confidence: 99%

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

Riegraf

Öchsner

Greuling

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Previous researchers calculated the tearing limit based on this criterion, Eq (22). Where UTS is the ultimate tensile stress, and c is the cracking factor which should be greater than unity [29].…”

Section: 5calculation Of Tearing Limit With the Energy Criterionmentioning

confidence: 99%

“…Finally FBHF,max is obtained using Eq (21). In order to calculate FBHF,max based on the first and second criterion, 𝜎 𝑟,𝑗,𝑐𝑟𝑎𝑐𝑘 is, firstly, obtained using either Eq (22), or (24), and FBHF,max is obtained at different stages of the punch stroke using Eq (25).…”

Section: 5calculation Of Tearing Limit With the Energy Criterionmentioning

confidence: 99%

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A novel estimation of tearing limit in deep drawing process based on strain energy; experimental characterization and numerical validation

Khaboushani

Aminzadeh²,

Parvizi³

2022

Int J Adv Manuf Technol

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Deep drawing is a forming process widely used in aerospace, military, automotive, and various industries. One of the essential useful parameters in the quality of deep-drawn products is Blank Holder Force (BHF). By Controlling BHF during the process, formability has been improved, reduced forming energy, and sheet thickness. Tearing is one of the most common and crucial defects in this process due to high radial stress in the cup's wall, resulting in many limitations in this field. In this process, the blank holder force plays an indispensable role in causing tearing.Therefore, controlling blank holder force during the process would be inevitable to avoid tearing or even wrinkling. This study aims to calculate the tearing limit with new criteria in analytical dominating plasticity Equations based on the slab Method. The St14 sheet with 1 mm thickness and 200 mm diameter is used in this study. The maximum blank holder force in each stage of punch stroke with new criteria based on strain energy with three different frictional coefficients is calculated, compared, and verified with FEM simulation and experimental results. Analytical results with new criteria are also compared with previous procedures. Finally, it is realized that results related to energy criteria have a lot more similarity with FEM simulation and experimental results in comparison with the previous ones.

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“…Padmanabhan et al [19] studied springback in forming TWBs under various stress states. Aminzadeh et al [20] developed an approach to predict residual stresses in TWBs using FEM followed by experimental validation. Kridli et al [21] investigated the formability of aluminum TWBs using a limiting dome height test.…”

Section: Introductionmentioning

confidence: 99%

Neural Network-Based Multi-Objective Optimization of Adjustable Drawbead Movement for Deep Drawing of Tailor-Welded Blanks

et al. 2022

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To improve the formability in the deep drawing of tailor-welded blanks, an adjustable drawbead was introduced. Drawbead movement was obtained using the multi-objective optimization of the conflicting objective functions of the fracture and centerline deviation simultaneously. Finite element simulations of the deep drawing processes were conducted to generate observations for optimization. The response surface method and artificial neural network were used to determine the relationship between variables and objective functions; the procedure was applied to a circular cup drawing of the tailor-welded dual-phase steel blank. The results showed that the artificial neural network had better prediction capability and accuracy than the response surface method. Additionally, the non-dominated sorting-based genetic algorithm (NSGA-II) could effectively determine the optima. The adjustable drawbead with the optimized movement was confirmed as an efficient and effective solution for improving the formability of the deep drawing of tailor-welded blanks.

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A novel approach of residual stress prediction in ST-14/ST-44 laser welded blanks; mechanical characterization and experimental validation

Cited by 14 publications

References 10 publications

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

Experimental analysis of parameters for AlSi10Mg powders from different manufacturers in selective laser melting

A novel estimation of tearing limit in deep drawing process based on strain energy; experimental characterization and numerical validation

Neural Network-Based Multi-Objective Optimization of Adjustable Drawbead Movement for Deep Drawing of Tailor-Welded Blanks

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