Fatigue-Resistant elastomers

被引：100

作者：

Li, Chenghai ^{[1
]}

Yang, Hang ^{[1
]}

Suo, Zhigang ^{[2
]}

Tang, Jingda ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Dept Engn Mech, Int Ctr Appl Mech, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China

[2] Harvard Univ, Kavli Inst Bionano Sci & Technol, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS | 2020年 / 134卷

基金：

中国国家自然科学基金;

关键词：

Elastomer; Fatigue-resistant; Threshold; 3D printing; Composites; THRESHOLD TEAR STRENGTH; FRACTURE; HYDROGEL;

D O I：

10.1016/j.jmps.2019.103751

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The resistance of a material to the growth of a crack is characterized by fracture toughness under monotonic load, and by fatigue threshold under cyclic load. The fatigue threshold of engineering elastomers is commonly limited to similar to 50 J/m(2), much below their toughness (10(3)similar to 10(5) J/m(2)). Here we report fatigue-resistant elastomers with threshold beyond 500J/m(2). Such an elastomer is a composite of two elastomers: a lattice of a hard elastomer embedded in a matrix of soft elastomer. Both the hard and soft elastomers are elastically stretchable, with small hysteresis. At a crack front in the composite, the soft matrix shears greatly, which de-concentrates stress in the hard lattice. When the crack advances in the composite, the energy dissipated scales with the feature size of the lattice. By contrast, when a crack advances in a homogeneous elastomer, the energy dissipated scales with the mesh size of the polymer network. The fatigue-resistant elastomers open new opportunities for applications requiring stretchable materials. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：12

共 46 条

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