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 fordamage 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 largely unexplored. These properties are critical to eventual DoD applications and this project aims to bridge this gap. The effort proposed here (in collaboration with an independently funded effort at University of Cambridge will be focused on developing additivemanufacturing processes, and printing unprecedented metamaterials with tens of millions of units cells which unveils the novel damage tolerance mechanics not possible in any current study. 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 and shock 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
- Sep 11, 2023
- Source ID
- N000142312797
Entities
People
- Xiaoyu (rayne) Zheng
Organizations
- Office of Naval Research
- United States Navy
- University of California Regents