Evaluation of mechanical properties and springback for embossed aluminum sheet - part I

Abstract

Embossed aluminum sheets 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.

The forming characteristic in the single-point incremental forming of a complex shape

“…The elastic-plastic simulation was used; the material density was 2.7E-9 ton/mm 3 ; the Young modulus was 70 GPa; the Poisson ratio was 0.3; the stress-strain curve was evaluated by σ = Kε n with a strength coefficient (K) of 312 MPa and a strain hardening coefficient (n) of 0.3. The ABAQUS explicit finite element code was used with the anisotropic material parameters r 0 = 0.57, r 45 = 0.59, and r 90 = 0.65 (Kim et al, 2015a). The simulation results are well adaptive to the experiment results.…”