Bimodular Behavior and Crack Closure in Compression in a Brittle Material,
Abstract
A vibrating beam method was used to determine the elastic modulus of graphite rods. The frequency and apparent modulus were determined as a function of compressive end loading. Following fracture of the rod, the frequency and apparent modulus were decreased. At a compressive and loading of about 0.83 MPa (120 psi), crack closure was sufficient for the fractured rod to behave similarly in vibration to the unfractured rod. Thus, the fractured material behaves in a bimodular fashion and crack closure can be achieved to enable unimpeded stress transfer across the fracture surface during vibration. Keywords: Bimodular behavior, Elastic modulus measurements, Graphite, Microcracking and modulus.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1987
- Accession Number
- ADA191267
Entities
People
- L. A. Feldman
Organizations
- The Aerospace Corporation