Highly-stretchable 3D-architected Mechanical Metamaterials.
Soft materials featuring both 3D free-form architectures and high stretchability are highly desirable for a number of engineering applications ranging from cushion modulators, soft robots to stretchable electronics; however, both the manufacturing and fundamental mechanics are largely elusive. Here, we overcome the manufacturing difficulties and report a class of mechanical metamaterials that not only features 3D free-form lattice architectures but also poses ultrahigh reversible stretchability (strain > 414%), 4 times higher than that of the existing counterparts with the similar complexity of 3D architectures. The microarchitected metamaterials, made of highly stretchable elastomers, are realized through an additive manufacturing technique, projection microstereolithography, and its postprocessing. With the fabricated metamaterials, we reveal their exotic mechanical behaviors: Under large-strain tension, their moduli follow a linear scaling relationship with their densities regardless of architecture types, in sharp contrast to the architecture-dependent modulus power-law of the existing engineering materials; under large-strain compression, they present tunable negative-stiffness that enables ultrahigh energy absorption efficiencies. To harness their extraordinary stretchability and microstructures, we demonstrate that the metamaterials open a number of application avenues in lightweight and flexible structure connectors, ultraefficient dampers, 3D meshed rehabilitation structures and stretchable electronics with designed 3D anisotropic conductivity.
Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Yanhui
Y
Jiang
Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Qiming
Q
Wang
Science. 2014 Aug 8;345(6197):644-6
25104380
Nat Mater. 2013 Oct;12(10):893-8
23995324
Phys Rev Lett. 2014 Oct 24;113(17):175503
25379923
Nat Mater. 2015 Jan;14(1):23-36
25344782
Science. 2009 Jan 9;323(5911):237-40
19131625
Nat Mater. 2016 Apr;15(4):413-8
26808461
Nat Commun. 2015 Mar 18;6:6566
25782446
Proc Natl Acad Sci U S A. 2016 Mar 22;113(12):3179-84
26951646
Science. 2011 Nov 18;334(6058):962-5
22096194
Adv Mater. 2015 Nov 4;27(41):6334-40
26384472
Nat Mater. 2015 Apr;14(4):384-8
25502100
Nature. 2015 May 28;521(7553):467-75
26017446
Science. 2012 Aug 17;337(6096):828-32
22904008
Nat Mater. 2016 Feb;15(2):190-6
26552058
Adv Mater. 2012 Sep 18;24(36):4782-810
22899377
Biofabrication. 2014 Jun;6(2):025003
24658060
Lab Chip. 2014 Aug 7;14(15):2610-3
24828586
Science. 2014 Sep 12;345(6202):1322-6
25214624
Nat Biotechnol. 2014 Aug;32(8):773-85
25093879
Proc Natl Acad Sci U S A. 2011 Jan 4;108(1):67-72
21149682
Proc Natl Acad Sci U S A. 2011 Dec 20;108(51):20400-3
22123978
Science. 2010 Mar 26;327(5973):1603-7
20339064
Nat Commun. 2015 May 15;6:7038
25975372
Adv Mater. 2015 Aug 5;27(29):4296-301
26088462
Proc Natl Acad Sci U S A. 2015 Sep 15;112(37):11502-7
26330605
Science. 2014 Jun 20;344(6190):1373-7
24948733
Sci Rep. 2015 Sep 08;5:13616
26346202
Nat Mater. 2012 Sep;11(9):768-74
22751181
Science. 2013 Feb 15;339(6121):773-9
23413348
Science. 2015 Jul 10;349(6244):161-5
26160940
Chem Soc Rev. 2016 Jan 21;45(2):359-76
26750617
Proc Natl Acad Sci U S A. 2014 Feb 18;111(7):2453-8
24550268
Nat Commun. 2012 Jun 26;3:916
22735444
Adv Mater. 2016 Feb 24;28(8):1631-5
26663556
Nat Commun. 2014 Sep 16;5:4899
25225837
Adv Mater. 2013 Sep 25;25(36):5044-9
23878067
Science. 2016 Jan 1;351(6268):58-62
26721993
Adv Mater. 2015 Jul 15;27(27):4035-40
26033288
Nat Commun. 2016 Mar 11;7:10929
26965475
Nat Mater. 2016 Apr;15(4):438-43
26828314
Science. 2015 Mar 20;347(6228):1349-52
25780246