Optimal Functionally Graded Cellular Materials (FGCMs) to Mitigate Shock and Impact Loading
Abstract
The main objective of the proposed work is to develop a well-defined, experimentally-validated material model that can be implemented in the design of optimal functionally graded cellular materials (FGCMs)that can effectively mitigate shock and impact loading. First, different density foams with known cell size and structure will be investigated to improve our understanding of the failure processes that are activated in cellular materials subjected to high strain rate loading. The specimens will be subjected to controlled high strain rate impact and shock loading conditions while using multi-scale imaging and digital image correlation to (a) observe the local deformation processes, (b) quantify the local deformations and strain that are present and (c) quantify the inertia and change in local densities that are experienced by the heterogeneous cellular material system. The observations and measurements will be integrated with an inverse method to quantify the full field stress-strain relation of the material across the specimen section by accounting for the effect of inertia, strain rate, and change in density. The constitutive relation obtained experimentally will be used to develop a material model that governs the response of cellular materials subjected to high strain rate loading as a function of density and loading rate. Finally, using the constitutive relationship and a semi-analytical method, a range of FGMC topologies will be explored to obtain an optimal design for functionality. In this proposal, the PI will focus on the shock and impact mitigation functionally and the optimal design will be selected through energy absorption and efficiency diagrams. The concepts proposed for this study can be extended to other functionality, including thermal acoustic transport properties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 24, 2023
- Accession Number
- AD1229397
Entities
People
- Addis Kidane
Organizations
- University of South Carolina