The Determination of Mechanical Properties of Seamed Tube with Hydraulic Bulge Test

The accuracy and appropriateness of plate properties for seamed tube hydroforming analysis and process design is questionable due to the fact that the properties are changed obviously during the seamed tube forming process. Thus a testing method that would give properties of seamed tubes accurately is necessary. The theoretical calculation and experimental measurement of base material mechanical properties is the main concern of this paper. The mechanical properties of welded zoon(including welded line and heat affected zoon),which would not measured by hydraulic bulge test due to the complex stress condition,is determined by uniaxial tension test and methed of mixture rule. At last,a numerical model of squared component is established by using the measured material mechanical properties. Good correlation between the simulation result and experiment data is indicated,and the accuracy of this measurement method is prared.