→5kN bidirectional tensile testing machine for cruciform specimen, used for bidirectional tensile test of thin metal sheet, to measure the elastoplasticity of metal sheet at fixed stress ratio or strain ratio.
→Orthogonal tensile force of cruciform sample on the plane was 4x5kN, with a constant displacement rate of 0.005-300mm/min and a constant strain rate of 0.0001s-1-0.1s-1. Stress and strain were measured synchronously and continuously.
→The bidirectional tensile stress-strain curve of the cruciform specimen was measured and the plastic work isoline (surface) per unit volume was determined.
→ISO16842(GB/T36024-2018) Metallic materials-Sheet and strip-Biaxial tensile testing method using a cruciform test piece