期刊
EXTREME MECHANICS LETTERS
卷 35, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eml.2019.100621
关键词
Bio-inspired materials; Nacre; Interlocking; 3D printing; Toughening mechanism
资金
- National Science Foundation, USA [CMMI-1462270]
Constituted by mineral tablets and organic interlayers, nacre is known for its attractive combination of stiffness, strength, and toughness. The impressive mechanical property of nacre can be attributed to the `brick-and-mortar' structure which is usually defined with two geometric parameters: tablet aspect ratio and volume fraction of the stiff phase. Inspired by the interlocking tablets found in red Abalone and Hyriopsis cumingii, we study the effect of interlock by introducing a third parameter: tablet waviness angle. Tension tests and single edge notched bend fracture tests are performed on the specimens of interlocking and non-interlocking nacre-like composites that are fabricated using a highresolution multi-material 3D printer. Stress distribution, deformation pattern and parameter analysis reveal the mechanical behavior of interlocking and non-interlocking nacre-like composites and how these three parameters affect the performance. Two failure patterns (soft phase failure and tablet break) and three toughening mechanisms (uncracked-ligament bridging, constrained microcracking, and crack deflection/twist) are found in three-point bending fracture tests, which uncovers the key to high toughness. Interlocking nacre-like composites clearly show enhanced tensile and fracture performance with an unusual combination of stiffness, strength, and toughness. (C) 2019 Elsevier Ltd. All rights reserved.
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