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Stress relaxation in polymeric microlattice materials

Krödel, Sebastian and Li, Lichen and Constantinescu, Andrei and Daraio, Chiara (2017) Stress relaxation in polymeric microlattice materials. Materials and Design, 130 . pp. 433-441. ISSN 0264-1275.

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Breakthroughs in fabrication techniques enabled the creation of microlattice materials, which are assembled from truss-like elements on the micro-scale. The mechanical properties of these materials can be controlled varying the geometry of their microstructure. Here, we study the effect of topology and effective density on the visco-elastic properties of microlattices fabricated by direct laser writing. We perform micro scale relaxation experiments using capacitive force sensing in compression. The experimental results are analyzed using a generalized Maxwell model and the viscoelastic properties are studied in terms of density scaling laws. We develop a finite element model that allows extracting the bulk polymer viscoelastic properties. The experimental results show that the stiffness of lattice materials can be adjusted independently from the loss factor in a wide range of frequencies. We find that the loss factor dramatically increases with applied strain due to the onset of nonlinear dissipation mechanism such as buckling and plasticity. We show that at effective densities around 50% the energy dissipation per cycle in a microlattice outperforms the dissipation in the bulk, giving rise to a “less is more” effect. The present research defines a first step in the application of microlattice materials in vibration absorption.

Item Type:Article
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Krödel, Sebastian0000-0002-9218-8578
Daraio, Chiara0000-0001-5296-4440
Additional Information:© 2017 Elsevier Ltd. Received 11 April 2017, Revised 17 May 2017, Accepted 22 May 2017, Available online 30 May 2017.
Subject Keywords:Microlattice; Viscoelasticity; Relaxation; Direct laser writing; Additive manufacturing; Vibration absorption
Record Number:CaltechAUTHORS:20170628-161000911
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Official Citation:Sebastian Krödel, Lichen Li, Andrei Constantinescu, Chiara Daraio, Stress relaxation in polymeric microlattice materials, Materials & Design, Volume 130, 15 September 2017, Pages 433-441, ISSN 0264-1275, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78679
Deposited By: Tony Diaz
Deposited On:29 Jun 2017 01:28
Last Modified:29 Jun 2017 01:28

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