The mechanics and physics of dynamic localization and fracture in heterogeneous ductile materials - analysis
Abstract
The purpose of the proposed effort is to identify the mechanisms which control localization and fracture in ductile heterogeneous materials at high strain rates. The team will carry out the micro- and macro- mechanical characterization of representative metal-matrix composite materials modelled with various multiscale approaches. The specific materials systems for study will be selected by AFRL-RX. Multiscale constitutive models will be implemented in finite element codes to simulate various dynamic fracture experiments that will be specifically designed and performed in THEORE3M. Namely, the team will carry out: (1) spall fracture experiments, (2) dynamic shear fracture tests and (3) ring expansion fragmentation experiments. This research effort will integrate the unique capabilities of AFRL-RX, the Technion University, and the Universidad Carlos III of Madrid to couple experimental and computational resources to address this critical need. Specifically, AFRL-RX will take the lead in the selection and micromechanical characterization of the materials, performing X-ray tomography and montage serial sectioning of selected specimens (pre- and post-mortem) to obtain a 3D reconstruction of the material microstructure, and EBSD analysis to determine the texture of the materials. Moreover, Technion will carry out the core of the macromechanical characterization, including tension, compression and shear high strain rate experiments, and will also perform dynamic shear-dominated interrupted fracture tests, which are going to provide indications of the evolution of the material microstructure in the course of plastic deformation. The University Carlos III of Madrid will focus on the multiscale modelling of the materials and the implementation of the constitutive models in finite element codes, and will also be responsible for the spall and ring expansion experiments.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jan 04, 2023
- Source ID
- FA86552117011
Entities
People
- Jose A Rodriguez-Martinez
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- Universidad Carlos III de Madrid