Biaxial Flexing of a Fiber-Reinforced Aluminum Composite
Abstract
Disks of silicon carbide continuous fiber-reinforced (90 DEG)4S aluminum were supported circumferentially on one side and the center of the other side with a pin. maxima principal tensile surface were determined during flexing with strain gages. Failure under monotonic loading initiated on the convex side of the disks with the formation of multiple breaks in the first layer of fibers. With further flexing, cracking extended to inner fiber layers. Finally, fracture extended through the convex surface layer of the aluminum matrix. On cyclic flexing, fiber cracking was found to be the failure mechanism whenever the cyclic principal surface strain range was 0.0035 or greater. For cyclic strain ranges less than 0.0035, slip bands and cracks were formed in the matrix in addition to the cracks formed in the fibers. The cyclic strain range limit for 10 to the 6th power cycles of life was found to approach 0.0015. the latter limit corresponded to a maximum cyclic fiber strain 0.00132, which is only 15% of the fiber strain to failure under monotonic uniaxial composite loading. Keywords: Metal matrix composites.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1989
- Accession Number
- ADA212742
Entities
People
- Marc S. Pepi
- Nikos Tsangarakis