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Title: Multi-morphology lattices lead to improved plastic energy absorption

Journal Article · · Materials & Design
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  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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While lattice metamaterials can achieve exceptional energy absorption by tailoring periodically distributed heterogeneous unit cells, relatively little focus has been placed on engineering heterogeneity above the unit-cell level. In this work, the energy-absorption performance of lattice metamaterials with a heterogeneous spatial layout of different unit cell architectures was studied. Such multi-morphology lattices can harness the distinct mechanical properties of different unit cells while being composed out of a single base material. A rational design approach was developed to explore the design space of these lattices, inspiring a non-intuitive design which was evaluated alongside designs based on mixture rules. Fabrication was carried out using two different base materials: 316L stainless steel and Vero White photopolymer. Results show that multi-morphology lattices can be used to achieve higher specific energy absorption than homogeneous lattice metamaterials. Additionally, it is shown that a rational design approach can inspire multi-morphology lattices which exceed rule-of-mixtures expectations.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1634146
Alternate ID(s):
OSTI ID: 1634810; OSTI ID: 1670179
Report Number(s):
SAND2020-5856J; SAND-2020-5346J; 686562
Journal Information:
Materials & Design, Vol. 194, Issue C; ISSN 0264-1275
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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