Stress distribution along the cruciform geometry under pure in-plane biaxial loading condition

Abstract

The present paper aims at designing a novel cruciform geometry which could effectively demonstrate the biaxial behavior of aluminum A1050-H14. A cruciform geometry with two geometric shapes milled about the center region on the basic cross-shaped geometry is considered for the present study. The geometric shapes include a double-armed cruciform and a circle but with different depths (geometric-shaped CS-I). An FEA tool is used to study the biaxial behavior of these geometries under two biaxial loading conditions: (1) biaxial tension (TT) and (2) biaxial compression–tension (CT). Along with the above-mentioned geometry, two more geometries are even analyzed to end up with a better geometry for the in-plane biaxial testing. The other two geometries are (1) modified cruciform with spline cut at the cross-arms of the sample and with a straight arm (CS-II), and (2) modified CS-I geometry by tapering the arms (CS-III). The geometry producing (1) uniform von Mises stress, (2) zero or minimal shear stress along the gauge section and (3) initiation of failure about the gauge section is considered.