Feature Size Effect on Formability of Multilayer Metal Composite Sheets under Microscale Laser Flexible Forming

Liu, Huixia; Zhang, Wenhao; Gau, Jenn-Terng; Shen, Zongbao; Ma, Youjuan; Zhang, Guoce; Wang, Xiao

doi:10.3390/met7070275

Cited by 11 publications

(5 citation statements)

References 45 publications

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“…Substituting Equation 3into Equation (4) one can get ε n /ε eq = 0.65 for samples of type 1, ε n /ε eq = 0.51 for samples of type 2 and ε n /ε eq = 0.29 for samples of type 3. Then, it follows from Equations (5) and (6) that Ω(0.51) = 0.122, Ω(0.65) = 0.141, Ω(0.29) = 0.092 7The domain of the function Ω ε n /ε eq is −1 ≤ ε n /ε eq ≤ 1. The Marciniak test (see, for example, [19,20]) can be adopted to produce various strain paths in the range −1 ≤ ε n /ε eq ≤ 0.…”

Section: Resultsmentioning

confidence: 99%

“…Micro sheet metal forming is an attractive manufacturing method capable of mass production at high productivity. However, it is difficult to miniaturize the size of products using conventional sheet metal forming techniques, because various size effects [1,2] such as material properties, forming condition, heat transfer [3], friction [4], formability [5] and machine functions seriously influence the quality of products. As one of the size effects in micro sheet metal forming, the ratio of grain size [6] and surface roughness [7,8] to thickness becomes large relative to the scaling down of product size.…”

Section: Introductionmentioning

confidence: 99%

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A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals

Aoto

Alexandrov

2019

Metals

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In sheet microforming processes, in-surface principal strain rates may be compressive such that the thickness of the sheet increases in the process of deformation. In general, the evolution of free surface roughness depends on the sense of the principal strain normal to the free surface. Therefore, in order to predict the evolution of free surface roughness in processes in which this normal principal strain is positive by means of empirical equations, it is necessary to carry out experiments in which the thickness of the sheet increases. Conventional experiments, such as the Marciniak test, do not provide such strain paths. In general, it is rather difficult to induce a sufficiently uniform state of strain in thin sheets of increasing thickness throughout the process of deformation because instability occurs at the very beginning of the process. The present paper proposes a compression test for thin sheets. Teflon sheets are placed between support jigs and the metallic sheet tested to prevent the occurrence of instability and significantly reduce the effect of the support jigs on the evolution of surface roughness. The test is used to determine the evolution of surface roughness in thin sheets made of C1220-O under three strain paths.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals

Aoto

Alexandrov

2019

Metals

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“…During the laser forming of stainless steel-carbon steel composite plate in ANSYS software, the non-uniform heat distribution and different heat conductivity and heat loss produce a warping force which causes undesirable deformation of composite in addition to the edge effect [39]. The sequence of layers is also important and affects the bending angle of the multilayer composite samples [40].…”

Section: Laser Forming Of Composite Sheetsmentioning

confidence: 99%

Recent Advances in the Laser Forming Process: A Review

Safari

Sousa

Joudaki

2020

Metals

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Laser forming is an emerging manufacturing process capable of producing either uncomplicated and complicated shapes by employing a concentrated heating source. The heat source movement creates local softening, and a plastic strain will be induced during the rise of temperature and the subsequent cooling. This contactless forming process may be used for the simple bending of sheets and tubes or fabrication of doubly-curved parts. Different studies have been carried out over recent years to understand the mechanism of forming and predicting the bending angle. The analysis of process parameters and search for optimized manufacturing conditions are among the most discussed topics. This review describes the main recent findings in the laser forming of single and multilayer sheets, composite and fiber-metal laminate plates, force assisted laser bending, tube bending by laser beam, the optimization technique implemented for process parameters selection and control, doubly-curved parts, and the analytical solutions in laser bending. The main focus is set to the researches published since 2015.

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“…Also, suitable energy is necessary to form complex parts, and the molding process can be applied to make parts with good surface quality [13]. Nonetheless, when using elastic materials, the impact pressure acting on the workpiece is greatly weakened, which severely affects the forming efficiency [14]. This problem has not been fundamentally solved.…”

Section: Introductionmentioning

confidence: 99%

Experiment and Simulation Study of the Laser-Induced Cavitation Bubble Technique for Forming a Microgroove in Aluminum Foil

Wang,

Su,

Jia

et al. 2023

Micromachines

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The present work introduces a laser-induced cavitation bubble technique for forming an axisymmetric structure (i.e., microgroove) and the dynamics of a cavitation bubble from initial expansion to the collapse stages that were also simulated. Furthermore, the shock wave signals and dynamic properties of the cavitation bubble were recorded using a hydrophone and a high-speed camera. The experiments on microgrooves formed by laser-induced cavitation bubble stamping were carried out, and the effects of laser energy, the initial position of the bubble, and the number of impacts on the microformability of aluminum sheets are discussed. The depth of the microgroove was investigated using experiments, and it was found that the process can serve as a rapid technique for impressing microfeatures on thin-sheet metals. The experimental results showed that as the initial position of the bubble increased, the deformation depth decreased. As the laser energy and number of impacts increased, the deformation depth increased. The results of the response surface experiments showed that a laser energy of 27 mJ, 3 impacts, and a bubble position of 3 mm were optimal for the process. By using the optimal parameters, flat and smooth microgrooves with a forming depth of 102.54 µm were successfully fabricated. Furthermore, the maximum thickness thinning of the microgroove section occurred at the entrance areas, and this area had the greatest hardness. This also indicated that the greatest amount of plastic deformation of the material and grain refinement occurred in this area. On the other hand, the aluminum foil did not undergo oxidation during the plastic deformation process. These results demonstrated that laser-induced bubble stamping is an advanced micromachining method with promising applications.

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Feature Size Effect on Formability of Multilayer Metal Composite Sheets under Microscale Laser Flexible Forming

Cited by 11 publications

References 45 publications

A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals

A New Compression Test for Determining Free Surface Roughness Evolution in Thin Sheet Metals

Recent Advances in the Laser Forming Process: A Review

Experiment and Simulation Study of the Laser-Induced Cavitation Bubble Technique for Forming a Microgroove in Aluminum Foil

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