期刊
COMPOSITES PART B-ENGINEERING
卷 44, 期 1, 页码 740-744出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2012.01.038
关键词
Polymer-matrix composites (PMCs); Theromosetting resin; Fatigue; Mechanical properties; Carbon nanotubes
资金
- agency of the United States Government
- Department of Energy
- Bayer MaterialScience LLC [DE-EE0001361]
The effects of carbon nanotube (CNT) inclusion on cyclic fatigue behavior and the tensile properties of polyurethane (PU) composites have been studied. Tension-tension cyclic fatigue tests were conducted at various load levels (30-50 MPa) to establish the relationship between stress and the number of cycles to failure (S-N curves). The tensile energy to break PU composites was enhanced up to 38% by using a low amount of CNTs. In addition, the incorporation of CNTs increased the fatigue life of PU in the high-stress amplitude, low-cycle regime by up to 248%. Micrographs show highly dispersed CNTs and indicate the key mechanisms for enhancement in fatigue life such as CNT crack-bridging and pull-out. The tensile-tensile fatigue properties obtained in this work show that PU systems can outperform epoxy systems widely used in structural applications. (C) 2012 Elsevier Ltd. All rights reserved.
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