STUDY AND DEMONSTRATION OF PAPER PHENOLIC COMPONENTS.
Abstract
The mechanical, thermal, and mass properties of convolute-wrapped paper phenolic tubing have been determined and a satisfactory technique has been developed for performing a stress analysis. Flexural effects discredited the NOL Split Disc Apparatus and required the development of a new technique for determining hoop tensile properties. The new technique consisted of a uniaxial hydroburst of the NOL Ring Specimen and was proven to be reliable. The stress-strain relationship of paper phenolic laminates was found to be nonlinear and to be most conveniently represented by the secant modulus. This nonlinear relationship and the anisotropic character of the material make a regorous stress analysis extremely tedious, and led to the development of an adequate technique for the analysis of discontinuities. This experimentally proven technique uses thin wall approximations and the substitution of hypothetical, equivalent, linearly elastic, isotropic materials. A thermal gradient test was performed on a simulated paper phenolic case motor but the analysis is not complete. Tests have shown that the materials properties are degraded by humidity and salt spray but not by the other evironments investigated. An epoxy-amide coating will provide protection from humidity and salt spray. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 09, 1967
- Accession Number
- AD0804923
Entities
People
- F. W. Mueller
- John W. Edwards
- Vic Singer