Cui, H.

Deshpande, V.S.

O\u27Masta, M.R.

Zheng, Xiaoyu

English

Purdue E-Pubs

Purdue UniversityPurdue e-PubsIUTAM Symposium Architectured MaterialsMechanics Symposium ContributionsSep 17th, 12:00 AM - Sep 19th, 12:00 AMFracture Toughness of Hierarchical, Low DensityArchitected MetamaterialsH. CuiVirginia Tech, huachen1@vt.eduM.R. O'MastaV.S. DeshpandeXiaoyu ZhengFollow this and additional works at: https://docs.lib.purdue.edu/iutamPart of the Engineering CommonsThis document has been made available through Purdue e-Pubs, a service of the Purdue University Libraries. Please contact epubs@purdue.edu foradditional information.Recommended CitationCui, H., O'Masta, M., Deshpande, V., & Zheng, X. (2018). Fracture Toughness of Hierarchical, Low Density ArchitectedMetamaterials. In T. Siegmund & F. Barthelat (Eds.) Proceedings of the IUTAM Symposium Architectured Materials Mechanics, September17-19, 2018 , Chicago, IL: Purdue University Libraries Scholarly Publishing Services, 2018. https://docs.lib.purdue.edu/iutam/presentations/abstracts/18 IUTAM Symposium Architectured Material Mechanics,  T. Siegmund, F. Barthelat, eds September 17-19, 2018, Chicago, IL, USA, , Chicago, IL, USA   Fracture Toughness of Hierarchical, Low Density Architected Metamaterials  H. Cuia, M.R. O’Mastab,c, V.S. Deshpandeb and Xiaoyu (Rayne) Zhenga  a Department of Mechanical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA b Engineering Department, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK c HRL Laboratories, LLC, 3011 Malibu Canyon Road, Malibu, CA 90265, USA  Rapid progress in additive manufacturing methods has led to the creation of a new class of ultralight, stiff and strong 3D architected metamaterials comprised of a network of hierarchical, stretch-dominated, micro-scale unit cells. The performance of these micro-architected metamaterials, spanning across multiple length scales, will ultimately be limited by their tolerance to damage and defects, yet an investigation of their fracture toughness has remained elusive.  Here, we provide the first experimental observations of different crack initiation modes activated by mode-I loading of notched low density, hierarchical metamaterials. We find that, through hierarchical micro-architected features, the low density, stretch-dominated metamaterials can achieve simultaneously higher fracture toughness and strength: properties that are usually mutually exclusive. Numerical and scaling relationships are also reported that accurately capture the measured fracture toughness and strength values. These are then used to develop design maps for the optimal hierarchical architectures as functions of the density of the metamaterial and failure strain of the parent material. 

Fracture Toughness of Hierarchical, Low Density Architected Metamaterials

https://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1017&amp;context=iutam

Fracture Toughness of Hierarchical, Low Density Architected Metamaterials

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