Bulge Test Sheet Metal

The hydraulic bulge test to iso 16808 is a test method used in materials testing for the determination of sheet metal forming properties.

Bulge test sheet metal.

Theoretically one can achieve strain levels of up to 40 50 before necking appear. It is clamped in place and inflated with hydraulic pressure. The bulge test is a commonly used experiment to establish the material stress strain response at the highest possible strain levels. 2equipment for the hydraulic bugle test.

For the axisymmetric case of the hydraulic bulge test. σ1 r1 σ2 r2 p t 1 where σ1 and σ2 are the principle stresses on the sheet surface r1 and r2 are the corresponding radii of the curved surface p the hydraulic pressure and t the sheet thickness. Initially two positions of the sheet with respect to the die were considered namely a elliptical bulge test 1. A die with an aperture diameter d of 80 mm and a fillet radius r of 5 mm was used to perform the bulge experiments.

The hydraulic bulge test is widely used in determin ing the strain hardening properties of sheet materials in biaxial tension. The following relationship between stresses sheet geometry and bulge pressure. The hydraulic bulge tests were carried out with strain rate as 0 007 s 1for the dc04 steel and 0 004 s 1for the en aw 6016 t4 aluminum alloy. It consists of a metal sheet placed in a die with a circular opening.

Directly from biaxial strain test. In the hydraulic bulge test a flat sheet specimen is deformed into dome under out of plane biaxial stretching and both the strains and the stresses can be defined. A sheet metal specimen is pressed against a silicon bulge different hardness stiffness for different material qualities. A metal blank specimen is fully clamped between the matrix and the blank holder.

When compared to standard uniaxial tensile test it. It consists of a metal sheet placed in a die with a circular. This is to create a hydrostatic pressure against the metal. Hydraulic bulge test represents an alternative method to obtain the stress strain hardening curve for sheet metal materials.

In the bulge test stress and strain can be determined up to failure of the specimen while in the conventional uniaxial test only the uniform strain range can be utilized. Rolling direction of the sheet coincides with major axis of ellipse figure 1 corresponding to stress path figure 2 b elliptical bulge test 2 transverse direction of the sheet coincides with major axis of ellipse figure 1 corresponding to stress path. Bulge test stress strain curve material characterization sheet metal forming abstract.