|About this Abstract
||MS&T23: Materials Science & Technology
||Integration between Modeling and Experiments for Crystalline Metals: From Atomistic to Macroscopic Scales V
||Hole Expansion Testing of Thin Sheet Materials at Various Strain Rates for Advanced Constitutive Model Calibration
||Jeremy D. Seidt, Yannis P. Korkolis, Carter Fietek, Hojun Lim
|On-Site Speaker (Planned)
||Jeremy D. Seidt
A methodology for identifying complex constitutive model parameters for plastic anisotropy in metallic sheets across a range of strain rates using the hole expansion test is presented. Hole expansion tests on two sheet metals (6061-T6 aluminum and 304 stainless steel) are conducted at rates ranging from 1E-4 m/s to 3 m/s using both a hydraulic load frame and a drop tower apparatus. Die fixtures were designed with an inclined mirror allowing for out-of-plane displacement and strain measurement using three-dimensional digital image correlation. Significant strain rate sensitivity is noted for both materials, particularly in equivalent plastic strain at fracture and the hole expansion ratio at failure. Experimental evidence of anisotropy is also evident in the hole expansion ratios in various directions within the sheet. Finite element simulations are conducted and compared to the experimental data in preliminary efforts to optimize and automate anisotropic plasticity and rate-dependence model parameters for both materials.