Optimal Boundary Shape of the Center-Reduced Cruciform Specimen for the In-Plane Biaxial Test

Cruciform specimens are one of the most common used to measure plane mechanical properties materials. Two significant difficulties in designing cross reducing stress concentration at intersection arms and improving stress/strain uniformity gauge area. The shape border cruciform specimen is tightly related above two. Due lack guidelines for design specimens, optimizing an urgent problem be solved increase reliability test results. By employing finite element method optimization method, boundary optimized, mathematical expression function specimen’s obtained. Furthermore, experiments validate optimum border. findings indicated that improved was reduced. optimal described this study can as a reference structural extensive strain testing specimen.