A study on the influence of different variables for determination of flow stress using hydraulic bulge test. (1st January 2013)

• Record Type: Journal Article
• Authors: Martins, Bruno; Santos, Abel D.; Teixeira, Pedro
• Is Part Of: International journal of materials engineering innovation. Volume 4:Number 2(2013)
• Page Start: 132
• Page End: 148
• Publication Date: 2013-01-01
• Subjects: hydraulic bulge test -- flow curve -- material characterisation -- sheet metal forming -- FEM; Materials science -- Periodicals; Materials -- Research -- Periodicals; Materials -- Technological innovations -- Periodicals; 620.11
• Languages: English
• ISSNs: 1757-2754

Abstract

Mechanical characterisation usually involves the standard uniaxial tensile test, providing relevant properties of sheet metal materials, which are used in numerical modelling of sheet forming operations to predict and assess formability and failure analysis. Since the range of strain obtained from tensile test is limited, extrapolation using a defined hardening law will be needed, thus being possible having dissimilar data for higher strains. The use of bulge test allows higher ranges of deformation and therefore, lower extrapolation. This paper presents a study on numerical modelling of the biaxial expansion bulge test and performs a sensitivity analysis on variables used to calculate the stress and strain, which strongly affects the accuracy of the obtained hardening curve. This analysis is done for some influencing variables used in measurements, thus specifying some directions in the design and use of a developed experimental mechanical system, in order to obtain better accuracy for such results.