Biaxial Tensile Fracture of ATJ-S Graphite.
Abstract
Failure strains were measured in specimens of ATJ-S graphite fractured in biaxial tension using a test method that relies on the centrifugal forces produced by rotation to induce the desired stresses. The results are presented in terms of the cumulative probability of fracture versus maximum principal strain, and are compared to similar data for ATJ-S in uniaxial tension. The comparison shows that, at a given level of strain, the fracture probability is somewhat larger in biaxial tension than in uniaxial tension. An exploratory biaxial test on a specimen of carbon-carbon composite was conducted in the same test fixtures to demonstrate the wider applicability of the rotational method. Stress calculations using elastic and two nonlinear constitutive formulations, are presented for rotating bodies in the form of circular disks and slender bars. The predicted strains are compared to those measured on rotating specimens of ATJ-S and the validity of the various assumed stress-strain laws is discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1975
- Accession Number
- ADA013166
Entities
People
- Julius Jortner