EFFECT OF SURFACE TREATMENTS ON THE MECHANICAL BEHAVIOR OF FILLED RUBBER.
Abstract
Tests were conducted to determine the effects of high rates of loading and of typical adhesives on the mechanical behavior of EP-87 rubber, a filled rubber used as insulation in rocket chambers. It was found that the higher rate of loading studied did not affect the brittle-ductile transition temperature, but it did make the rubber more sensitive to a surface notch. It was also found that standard epoxy adhesives applied to the surface of this material: (a) reduce the tensile elongation from approximately 200% for the control material to one to two percent for the coated material; (b) reduce the Charpy impace strength from approximately nine ft-lb for the control material to one to two ft-lb for the coated material; (c) increase the brittle-ductile transition temperature from approximately 40F for the control material to approximately 80F for the coated material. Shallow surface notches or scratches have a similar effect on the impact strength and transition temperature. A flexible adhesive, however, has little or no effect on the mechanical behavior of this same material. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0607195
Entities
People
- Daniel R. Mulville
- Irvin Wolock
Organizations
- United States Naval Research Laboratory