Self-triggered reconfigurable composite topological mechanical metamaterials
Abstract
The objective of our work is to realize structures that change shape and properties through internal triggers during the process of,performing their function. An example is a structure that reconfigures itself from a compliant lattice to a stiff one when it is und,er deformation. Another example is a material that stiffens in response to a temperature change. We will do this by additive manufac,turing of composite lattice geometries that include shape memory materials or internal strains in critical locations. We call these,structures self-triggered reconfigurable composite topological metamaterials. The self-triggering is described above and it leads to, reconfigurability, the switching from one configuration to another. The structures are composites because they are manufactured wit,h at least two different materials or are functionally graded. Topological refers to their architectured geometries, which are often, lattices and exhibit topological phase transitions that lead to drastic changes in mechanical properties. Metamaterials are the cla,ss of materials in which their properties are strongly dependent upon their geometry rather than their actual material constitutions,. However, the class of metamaterials we are proposing will contain material nonlinearities owing to the internal triggers that grea,tly expand the design space. The periodic nature of metamaterials, which lend themselves to modularity and modular assembly, creates, a paradigm shift in the design of large mechanical structures that can be 3D printed in parallel. Such self-triggered topological m,etamaterials are lightweight with tunable stiffnesses. Applications include impact mitigation, wave tailoring, metadamped structures,, and fibrillar metamaterials, including light-weight space structures. Rapid prototypes of designs will be built and tested using p,olymers. Functional structures for structural applications will be printed with metals.The research to be supported with the propose,d equipment includes currently funded DoD work on topological metamaterials with reconfigurable stiffnesses and metadamping as well,as proposed DoD projects to design high precision space structures assembled by the 3D printed modules of high stiffness, highly dis,sipative, auxetic/negative thermal expansion metamaterials. The research is highly collaborative involving multiple investigators tr,aining several students in different departments of the university. Thus the proposed equipment will advance the education of these,students on the topics of metamaterials, their manufacture via advanced additive techniques, and their characterization utilizing ex,isting state-of-the-art full-field methods developed by the investigators such as in-situ magnetic resonance phase imaging of displa,cement fields (Arruda) and laboratory-scale in-situ high-energy diffraction microscopy (Bucsek). The research supported with the pro,posed equipment is a collaboration among investigators with significant experience in research of relevance to the DoD (Arruda, Mao,, Tol, Waas) and investigators, including young investigators being introduced to DoD-relevant applications of metamaterials (Bucsek,, Gordon, Okwudire). The expertise of the latter group, in the use of process optimization and advanced control strategies to improve, the speed and precision of metal additive manufacturing, and characterization of specialized alloys, enhances the design space for,ongoing and future DoD work in metamaterials.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 13, 2022
- Source ID
- N000142212300
Entities
People
- Ellen M. Arruda
Organizations
- Board of Regents of the University of Michigan
- Office of Naval Research
- United States Navy