Numerical Models for Constitutive Behaviors of Ferrous Metals
Abstract
A mechanical user material subroutine (UMAT) developed for ferrous metals is documented. The UMAT includes a number of subroutines for different constitutive behaviors characteristic of ferrous materials. The present focus is on constitutive models used in recent research on dynamic responses of phase-transforming steels and pure iron (Fe). Models can account for finite deformation, nonlinear thermoelasticity, plasticity from dislocations and twinning, damage from voids, and solid-solid phase transitions driven by pressure, shear stress, temperature, and magnetic fields. Two different kinds of equation of state are encompassed. General yield and flow functions of history and local state capture the net deviatoric stress-strain behavior. Two different kinetic functions for phase transitions are included. A generalized void growth law with degradation of tangent elastic coefficients and material strength is given. A separate, coupled magnetic user material subroutine (MAGUMAT) is implemented to update the magnetization and magnetic field-dependent properties. A material point simulator (MPS) software that calls both the UMAT and MAGUMAT is described. Verification examples invoking the MPS are reported.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 25, 2023
- Accession Number
- AD1211290
Entities
People
- Jeffrey T. Lloyd
- John D. Clayton
Organizations
- United States Army Research Laboratory