Carbonaceous Fiber Composites
Abstract
Carbon and graphite fibers are now available with a range of physical properties; the graphite fibers are stiffest and strongest with moduli to 37 x 10 to the 11th power dynes/sq cm (54 million psi) and strengths to 28 x 10 to the 9th power dynes/sq cm (400,000 psi). A total of 17 types of carbonaceous fibers was bonded with epoxy resins into unidirectional composites and tested for physical properties. Composite moduli and tensile strengths showed effective translation of fiber properties to composite properties, but shear strengths were low, ranging from 2.0 to 4.8 x 10 to the 8th power dynes/sq cm (2900 to 7000 psi). These low shear strengths generally limited flexural and compressive strengths to relatively low values. A fiber treatment to grow silicon carbide whiskers and deposites on the fibers has given shear strengths up to 12.4 x 10 to the 8th power dynes/sq cm (18,000 psi), but with fiber tensile strength reduction of 5 to 70%. Long-term water exposure of stressed composites showed varying results, depending on fiber and exposure condition.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 1968
- Accession Number
- AD0848501
Entities
People
- Robert A. Simon
- Stanley P. Prosen
Organizations
- Naval Ordnance Laboratory