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1. Bi-material topology optimization for energy dissipation with inertia and material rate effects under finite deformations

   https://doi.org/10.1016/j.finel.2019.06.003  

   Alberdi, Ryan ; Khandelwal, Kapil ( October 2019 , Finite Elements in Analysis and Design)
2. Shear Wave Propagation and Estimation of Material Parameters in a Nonlinear, Fibrous Material

   https://doi.org/10.1115/1.4044504  

   Hou, Zuoxian ; Okamoto, Ruth J. ; Bayly, Philip V. ( May 2020 , Journal of Biomechanical Engineering)

   Abstract This paper describes the propagation of shear waves in a Holzapfel–Gasser–Ogden (HGO) material and investigates the potential of magnetic resonance elastography (MRE) for estimating parameters of the HGO material model from experimental data. In most MRE studies the behavior of the material is assumed to be governed by linear, isotropic elasticity or viscoelasticity. In contrast, biological tissue is often nonlinear and anisotropic with a fibrous structure. In such materials, application of a quasi-static deformation (predeformation) plays an important role in shear wave propagation. Closed form expressions for shear wave speeds in an HGO material with a single family of fibers were found in a reference (undeformed) configuration and after imposed predeformations. These analytical expressions show that shear wave speeds are affected by the parameters (μ0, k1, k2, κ) of the HGO model and by the direction and amplitude of the predeformations. Simulations of corresponding finite element (FE) models confirm the predicted influence of HGO model parameters on speeds of shear waves with specific polarization and propagation directions. Importantly, the dependence of wave speeds on the parameters of the HGO model and imposed deformations could ultimately allow the noninvasive estimation of material parameters in vivo from experimental shear wave image data. 

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3. Scalable multi-material additive manufacturing of bioinspired polymeric material with metallic structures via electrically assisted stereolithography

   https://doi.org/10.1115/1.4055793  

   Tang, Tengteng ; Ahire, Bhushan ; Li, Xiangjia ( September 2022 , Journal of Manufacturing Science and Engineering)

   Abstract Heterogeneous material systems consisting of metallic structures and polymer matrixes are of significance for applications such as integrated circuits, microelectromechanical devices, antennas, sensors, actuators, and metamaterials. Scaly-foot snail which lives in the deep ocean exhibits high strength and temperature resistance due to unique shells made of metal and polymer. Recently, different multi-material structures have been fabricated with metal deposition using multiple manufacturing processes. However, using these complicated hybrid processes is challenging to construct complex 3D structures of heterogeneous material with enhanced properties, high resolution, and time efficiency. Here, we establish a novel manufacturing strategy to build bioinspired hierarchical structures with heterogeneous material systems using electrically assisted stereolithography. The photocurable printing solution that can act as an electrolyte for charge transfer was developed, and the curing characteristic of the printing solution was further investigated. A fundamental understanding of the formation mechanism of metallic structures on the polymer matrix was studied through physics-based multiscale modeling and simulations. The correlation between metallic structures morphology, printing solution properties, and printing process parameters, and their effects in building bioinspired hierarchical structures with heterogeneous materials were identified. Demonstrative test cases were built to verify the printing performance of the proposed approach. This research work will deliver a scalable AM process that can facilitate various interesting applications based on bioinspired heterogeneous material and structures. 

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4. A hybrid material-point spheropolygon-element method for solid and granular material interaction

   https://doi.org/10.1002/nme.6345  

   Jiang, Yupeng ; Li, Minchen ; Jiang, Chenfanfu ; Alonso-Marroquin, Fernando ( January 2020 , International Journal for Numerical Methods in Engineering)
5. Topologically Interlocked Material Systems: From a Material Design Concept to Properties

   Siegmund, T ( September 2018 , Proceedings of the IUTAM Symposium Architectured Materials Mechanics)

   Topologically interlocked stereotomic material systems are load-carrying assemblies of unit elements interacting by contact and friction. This contribution summarizes research on such material systems in a variety of configurations based on tessellation geometry and percolation, and it considers external rigid confined, external flexible confined, internal flexible confined, as well as considers the unit elements as solids (elastic and elastic-brittle) or shells (elastic), and under consideration of a range of assembly geometries. Siegmund, T. (2018). Topologically Interlocked Material Systems: From a Material Design Concept to Properties. In T. Siegmund & F. Barthelat (Eds.) Proceedings of the IUTAM Symposium Architectured Materials Mechanics, September 17-19, 2018, Chicago, IL: Purdue University Libraries Scholarly Publishing Services, 2018. https://docs.lib.purdue.edu/iutam/presentations/abstracts/70 

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