Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 10, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2120563119
Keywords
programmable complex mechanical response; multimaterial fabrication; digital synthesis; large deformation; topology optimization
Categories
Funding
- US NSF CAREER Award [CMMI-2047692]
- Villum Foundation Villum Investigator Project InnoTop
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In this study, a freeform inverse design approach is used to synthesize multiple hyperelastic materials into composite structures, enabling them to achieve arbitrary prescribed responses under large deformations. The digitally synthesized structures exhibit organic shapes and motions with irregular distributions of material phases. By utilizing multi material fabrication and heteroassembly strategies, function-oriented mechanical devices with highly complex yet navigable responses can be designed.
by Yonggang Huang, University, Programming structures to realize any prescribed mechanical response under large deformation is highly desired for various functionalities, such as actuation and energy trapping. Yet, the use of a single material phase and heuristically developed structural patterns leads to restricted design space and potential failure to achieve specific target behaviors. Here, through a freeform inverse design approach, multiple hyperelastic materials with distinct properties are optimally synthesized into composite structures to precisely achieve arbitrary and extreme prescribed responses under large deformations. The digitally synthesized structures exhibit organic shapes and motions with irregular distributions of material phases. Within the structures, different materials play distinct roles yet seamlessly collaborate through sophisticated deformation mechanisms to produce the target behaviors, some of which are unachievable by a single material. While complex in geometry and material heterogeneity, the discovered structures are effectively manufactured via multi material fabrication with different polydimethylsiloxane (PDMS) elastomers with distinct behaviors and their highly nonlinear responses are physically and accurately realized in experiments. To enhance programmability, the synthesized structures are heteroassembled into architectures that exhibit highly complex yet navigable responses. The proposed synthesis, multimaterial fabrication, and heteroassembly strategy can be utilized to design function-oriented and situation-specific mechanical devices for a wide range of applications.
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