Embossed aluminum sheets with triple rice grain pattern were been used in heat insulation purpose for automative exhaust parts because of increasing their surface areas and stiffness reinforcement.
However, there are many restrictions because of high rate of wrinkle occurrence on press working. We have performed the tensile and bending tests for embossed sheets to clarity its mechanical properties and springback characteristics. Embossed aluminum sheets showed a different flow stress after plastic yielding due to flattening the embossed cone shape. Above all, yield stress of parallel embossed specimen decreases while its diagonal one increases and the decrease of young`s modulus in the embossed sheets contributes to the increase of springback amount.
