Influence of Servo Motion on Forming Limit of Thin Metallic Foils Using Micro Bulge Test

Ryo Yamaguchi; Tetsuhide Shimizu; Ming Yang

doi:10.4028/www.scientific.net/KEM.716.208

Paper Titles

Investigation on Friction Conditions during a Severe Bending Deformation on a Thick Plate
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Measurement of Coefficient of Friction in Hot Stamping by Hot Deep Drawing Test
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Relationship between Molecular Structures of Organic-Sulfur Compounds and Metal Forming Performance
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Effect of Microstructure and Mechanical Properties Formation of Medium Carbon Steel Wire through Continuous Combined Deformation
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Influence of Servo Motion on Forming Limit of Thin Metallic Foils Using Micro Bulge Test
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Influence of Strain Gradient on Springback of Thin Pure Titanium Foils in Microbending Assisted by Resistance Heating
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Metallic Multilayered Materials Produced by Constrained Compression
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Multi-Resolution Material Hardening Law for CPFE Micro-Forming Analysis
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Shear Banding in Polycrystalline Aluminium and Copper Pre-Deformed by ECAP and Subsequently Plane Strain Compressed
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 716Influence of Servo Motion on Forming Limit of Thin...

Influence of Servo Motion on Forming Limit of Thin Metallic Foils Using Micro Bulge Test

Abstract:

The demand of microforming is increasing as one of the economical production methods for small metallic parts. However, the formability of metallic foils decreases with decreasing ratio of thickness to grain size. In the present study, a process combining step motion and ultrasonic vibration is proposed to enhance the formability by stress relaxation. To investigate the effect of stress relaxation on forming limit of metallic foils in different stress states, micro bulge tests were carried out. The material used was brass foils with a thickness of 0.03, 0.05 and 0.08 mm. For calculating the strains of the deformed specimens, a pattern of dots with a diameter and a pitch of 50 and 60 μm was fabricated on the surface of the specimens by photolithography. The results of micro bulge tests showed that the forming limit increases by the stress relaxation regardless of stress states, except for the foil with a thickness of 0.03 mm. The possibility of enhancing the formability of metallic foils by stress relaxation was experimentally demonstrated.

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Periodical:

Key Engineering Materials (Volume 716)

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208-214

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https://doi.org/10.4028/www.scientific.net/KEM.716.208

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Online since:

October 2016

Authors:

Ryo Yamaguchi*, Tetsuhide Shimizu, Ming Yang

Keywords:

Forming Limit, Microforming, Servo Motion

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