Enhancing Fatigue Performance of Sandwich Composites with Nanophased Core

被引:5
作者
Zainuddin, S. [2 ]
Mahfuz, H. [1 ]
Jeelani, S. [2 ]
机构
[1] Florida Atlantic Univ, Dept Ocean & Mech Engn, Boca Raton, FL 33431 USA
[2] Tuskegee Univ, Ctr Adv Mat T CAM, Tuskegee, AL 36088 USA
基金
美国国家科学基金会;
关键词
MECHANICAL-PROPERTIES; CRACK GROWTH; NANOCOMPOSITES;
D O I
10.1155/2010/712731
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report fatigue performance of sandwich composites with nanophased core under shear load. Nanophased core was made from polyurethane foam dispersed with carbon nanofiber (CNF). CNFs were dispersed into part-A of liquid polyurethane through a sonication process and the loading of nanoparticles was 1.0 wt%. After dispersion, part-A was mixed with part-B, cast into a mold, and allowed to cure. Nanophased foam was then used to fabricate sandwich composites. Static shear tests revealed that strength and modulus of nanophased foams were 33% and 19% higher than those of unreinforced (neat) foams. Next, shear fatigue tests were conducted at a frequency of 3 Hz and stress ratio (R) of 0.1. S-N curves were generated and fatigue performances were compared. Number of cycles to failure for nanophased sandwich was significantly higher than that of the neat ones. For example, at 57% of ultimate shear strength, nanophased sandwich would survive 400,000 cycles more than its neat counterpart. SEM micrographs indicated stronger cell structures with nanophased foams. These stronger cells strengthened the sub-interface zones underneath the actual core-skin interface. High toughness of the sub-interface layer delayed initiation of fatigue cracks and thereby increased the fatigue life of nanophased sandwich composites.
引用
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页数:8
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