Nonlinear Multiaxial Modeling of Graphitic and Carbon-Carbon Materials
Abstract
The nonlinear material model due to Jones and Nelson is extended to temperature-dependent material behavior and applied to the analysis of the Southern Research Institute Thermal Stress Disk Test. The predicted diametral deformations of the annular disk are within three percent of the measured deformations at three times in a specific test. The Jones-Nelson model is extended to treatment of materials with first nonlinear then linear stress- strain behavior in what is called the Jones-Nelson-Morgan nonlinear material model. The JNM model is necessary for materials with strong nonlinearities as is demonstrated for ATJ-S graphite in a reentry vehicle nosetip stress analysis. The JNM model is also speculated to be useful for carbon-carbon materials because all pertinent numbers and types of nonlinearities can be treated. A linear elastic multimodulus analysis is used to demonstrate that the ASTM flexure Test does not lead to useful results for carbon-carbon and other multi- modulus materials. Necessary future modeling work for carbon-carbon is outlined.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1976
- Accession Number
- ADA040074
Entities
People
- Robert M. Jones
Organizations
- Southern Methodist University