ISSN:
0272-8397
Keywords:
Chemistry
;
Chemical Engineering
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the study of complex short-fiber-reinforced plastics behavior, it is helpful to begin with a well-aligned short-fiber system. This study isolates the effects of fiber-aspect ratio and orientation distributions on the tensile stress- strain behavior and failure mechanisms for a system containing 50 vol% E-glass fiber bundles in a ductileepoxy matrix. Using a system wherein the fiber orientation distribution was well-characterized, it is shown that the fibers reinforced as bundles rather than as individual fibers. As the bundle-aspect ratio varied from 185 to 557 for samples tasted in the longitudinal majoralignment direction, the modulus rose from 85 to 99 percent of the value for a continuous fiber system, while the strength rose only to about 60 percent of the continuous-fiber system. The ductility of the matrix had no effect on the modulus or the longitudinal strengths, but the off-axis strengths were significantly higher than has been reported for a comparable brittle-matrix system. The effects of fiber orientation on modulus and strength were successfully fit with the Leknitskii and Azzi-Tsai equations, respectively. SCanning electron micros-copy showed excellent adhesion and no fiber brekage, except at the highest bundle-aspect ratio. Even at off-axis angles below 15°, a mixed mode failure mechanism occurs because of the fiber orientation distribution.
Additional Material:
16 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pc.750040110
Permalink
