A Robust Methodology for Estimating Material Parameters for the Ramaswamy-Stouffer Constitutive Model

摘要

The program MATS was developed in a previous study to find material constants for the Ramaswamy-Stouffer constitutive model. The constants were used in that study to run simulations of Timetal-21s which were then compared to experimental results. In this study, parametric studies were performed to investigate the sensitivities of the material constants with respect to the others and the influence of the scheme for interpolating material constants for temperatures between known values in yielding a calculated response. The results of the parametric studies were used to 'fine tune' the material constants and help determine the 'best' interpolation scheme for capturing the transition from strain-rate-independent to strain-rate-dependent behavior.