Deep Learning for Size-Agnostic Inverse Design of Random-Network 3D Printed Mechanical Metamaterials

Deep Learning for Size-Agnostic Inverse Design of Random-Network 3D Printed Mechanical Metamaterials

Pahlavani, H. (TU Delft Biomaterials & Tissue Biomechanics)
Tsifoutis-Kazolis, Kostas (Student TU Delft)
Cruz Saldivar, M. (TU Delft Biomaterials & Tissue Biomechanics)
Mody, Prerak (Leiden University Medical Center)
Zhou, J. (TU Delft Biomaterials & Tissue Biomechanics)
Mirzaali, Mohammad J. (TU Delft Biomaterials & Tissue Biomechanics)
Zadpoor, A.A. (TU Delft Biomaterials & Tissue Biomechanics)

2023

Practical applications of mechanical metamaterials often involve solving inverse problems aimed at finding microarchitectures that give rise to certain properties. The limited resolution of additive manufacturing techniques often requires solving such inverse problems for specific specimen sizes. Moreover, the candidate microarchitectures should be resistant to fatigue and fracture. Such a multi-objective inverse design problem is formidably difficult to solve but its solution is the key to real-world applications of mechanical metamaterials. Here, a modular approach titled “Deep-DRAM” that combines four decoupled models is proposed, including two deep learning (DL) models, a deep generative model based on conditional variational autoencoders, and direct finite element (FE) simulations. Deep-DRAM integrates these models into a framework capable of finding many solutions to the posed multi-objective inverse design problem based on random-network unit cells. Using an extensive set of simulations as well as experiments performed on 3D printed specimens, it is demonstrate that: 1) the predictions of the DL models are in agreement with FE simulations and experimental observations, 2) an enlarged envelope of achievable elastic properties (e.g., rare combinations of double auxeticity and high stiffness) is realized using the proposed approach, and 3) Deep-DRAM can provide many solutions to the considered multi-objective inverse design problem.

additive manufacturing
deep learning
numerical simulations
random-network mechanical metamaterials
size-agnostic
variational autoencoder

http://resolver.tudelft.nl/uuid:b62d473b-618b-48c1-93d0-14c022c8967f

https://doi.org/10.1002/adma.202303481

0935-9648

Advanced Materials, 36 (2024) (6)

Institutional Repository

journal article

© 2023 H. Pahlavani, Kostas Tsifoutis-Kazolis, M. Cruz Saldivar, Prerak Mody, J. Zhou, Mohammad J. Mirzaali, A.A. Zadpoor