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Meeting Materials Science & Technology 2019
Symposium Formability and Fracture of Metal Sheets
Presentation Title Stress-strain Response in the Early Stage of Hydraulic Bulge Testing
Author(s) Lulu Deng, Junying Min, John E. Carsley, Thomas Stoughton, Jianping Lin
On-Site Speaker (Planned) John E. Carsley
Abstract Scope Inherent bending issues in the early stage of hydraulic bulge testing affects characterization of the elastic stress-strain response. Hydraulic bulge and cruciform biaxial tensile tests as well as numerical simulation of hydraulic bulging were carried out to understand the role of bending issues. The directly calculated elastic moduli from hydraulic bulging using classical membrane theory were smaller than those measured in cruciform tests of aluminium alloy AA6022 and high strength steel MP980. The difference between the calculated modulus from hydraulic bulging and the real modulus results from asynchronous transfer from elastic to plastic deformation of the layers through the thickness direction of bulged sheet in the early bending stage, and therefore depends on the thickness and yield strength of the sheet as well as tool geometry used for bulge testing. Recommendations are provided to process the stress strain response in the early stage of hydraulic bulge testing.
Proceedings Inclusion? Definite: At-meeting proceedings


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Stress-strain Response in the Early Stage of Hydraulic Bulge Testing
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