to characterize the formability of thin metal foils under pure biaxial strain conditions. The

study focuses on yellow brass foil (Cu-Zn) with a thickness of 0.2 mm, using a device with a

small bulge diameter (20 mm), relevant for mini-forming applications. The collected data

includes the relationship between pressure and bulge height, which is then converted into

effective stress and effective strain. This device aims to directly generate stress-strain data for

calculating the strain hardening exponent (n-value). Key innovations include the use of a

small bulge diameter suitable for mini-forming and the application of circular markers on the

specimen surface to facilitate the conversion of pressure-height data into stress-strain

parameters. Validation results show that the device accurately measures the pressure vs.

bulge height relationship. While initial data demonstrates accuracy in measuring pressure

and bulge height, additional methods are required to directly convert these measurements

into effective stress and strain parameters.This research provides an economical solution for

material characterization in mini-forming applications and presents a reliable tool for further

studies on various types of thin metal foils.

Keywords: Hydraulic Bulge Test Device, Biaxial Strain, Thin Metal Foils, Brass, Formability,

Mini-Forming

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