Finite Element Modeling for Constitutive Property Determination from Instrumented Dynamic Spherical Indentation
Abstract
Finite element (FE) modeling of instrumented dynamic indentation experiments in a miniature Kolsky bar is undertaken. The test material is polycrystalline aluminum alloy Al 6061-T6. The FE model, with representative material parameters from the literature, accurately reproduces the curvature of the experimental load versus depth data for three different experimental indentation velocity histories. A framework for dimensional analysis of instrumented dynamic spherical indentation is set forth, improving upon prior work. Parametric FE simulations reveal sensitivities of the predicted response to variations in the proposed independent dimensionless variables encompassing material properties. Based on the dimensional analysis, static indentation and elevated temperature indentation are recommended for extraction of quasi-static and thermal properties from previously uncharacterized metals, and dynamic indentation is recommended for extraction of strain-rate sensitivity that cannot be obtained from static tests. Rate sensitivity obtained from the dynamic indentation experiments and simulations produces a parameterized stress-strain response for Al 6061-T6 reasonably validated by external studies for strain rates up to the order of 10(expn 3)/s.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 2023
- Accession Number
- AD1200256
Entities
People
- Daniel Casem
- Jeffrey T. Lloyd
- John D. Clayton
Organizations
- United States Army Research Laboratory