Adaptable mechanical metamaterials with tailorable toughness and energy absorption
Abstract
Rapid progress in additive processing and topology-functionality designs over the last decade has enabled a myriad of mechanical metamaterials that are lightweight, yet stiff, strong and highly effective for impact mitigation in applications ranging from helmets for head injury protection to mitigation of high intensity dynamic loading resulting from shock front impingement. However, their mechanical performance is ultimately limited by their tolerance to damage and their susceptibility to failure from defects. Design for damage tolerance has remained elusive as studies have been limited to metamaterials with a small number of regular periodic unit cells, constrained by manufacturing scalabilities or to random foams with more cells, but with inefficient topology. The mechanics principles governing the resilience to damage and defects under both static and high-rate loading of architected metamaterials remains are largely unexplored. These properties are critical to eventual DoD applications and this project aims to bridge this gap. The 36-month effort proposed here (in collaboration with an independently funded effort at UC Berkeley that will be focussed on development of manufacturing routes) will aim to fill this gap. Specifically, we shall develop new experimental and numerical tools to probe these highly complex properties. Example include dynamic radiography coupled with high-speed photography to design shock guiding andshock dissipating metamaterials with a high damage tolerance. The designs will be constrained based on available processing routes and manufactured at UC Berkeley.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Nov 09, 2024
- Source ID
- N000142412519
Entities
People
- Vikram S Deshpande
Organizations
- Office of Naval Research
- United States Navy
- University of Cambridge