Sandia Labs FY22 Laboratory Directed Research & Development Annual Report

FY22 ANNUAL REPORT

SANDIA’S MULTIPHYSICS METAMATERIAL LATTICES REDUCE STRESS IN HARSH SHOCK AND VIBRATION ENVIRONMENTS BY 100X.

Mechanical metamaterials are an emerging class of materials for mitigating harsh shock and vibration environments. Mechanical metamaterials, here in the form of structural lattices, can be designed to exhibit desirable stiffnesses, vibrational responses, and compressibility to filter, direct, or absorb mechanical energy. The Sandia metamaterial design captures energy in lattices

partners at Georgia Tech designed, fabricated, and tested a one-dimensional nonlinear metamaterial for passive, amplitude-dependent energy transmission filtering, demonstrating a complementary approach. (PI: Laura Biedermann)

containing triangular-shaped petals. This lattice reduces peak stresses transmitted to the underlying structure. Lattices were additively manufactured at Sandia in 316L steel and tested using lab-scale nanosecond laser impulses and Sandia’s larger SPHINX and Z machine facilities. The lattices reduced transmitted stresses by 100x—in some cases

to below the measurement noise floor. Sandia Alliance

A steel lattice with triangular-shaped petals mitigated an incident shock with no identifiable damage. (Left and right images show the lattice before and after the incident shock.)

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