【国家标准】 金属材料　管　测定双轴应力-应变曲线的液压胀形试验方法

This standard specifies the terms and definitions,symbols and designations,principle,test equipment,test pieces,procedure,calculation of biaxial stress-strain curve,and test report of hydro-bulging test for determining biaxial stress-strain curve of metallic tubes.
This standard is applicable to thin-walled circular cross-sectioned metallic tubes with the wall thickness no less than 0.5 mm and the ratio of diameter to thickness (external diameter and thickness) greater than 20 (including both seamless and welded tubes).