An Analysis of Clip Strain Gage/Solid Propellant Interaction.
AIR FORCE ROCKET PROPULSION LAB EDWARDS AFB CALIF
Pagination or Media Count:
This report covers a detailed analysis of the mechanical interaction between a clip strain gage and a solid propellant uniaxial tensile sample, and the effects of this interaction on the strain measurement provided by the gage. Prototype clip strain gages developed by ThiokolHuntsville were analyzed and found to produce significant strain measurement bias original prototype 16 percent bias at 500 psi propellant modulus, final prototype 6 percent bias at 500 psi propellant modulus. Possible clip gage design changes geometry and materials to reduce measurement bias are discussed and potentially feasible approaches are identified. The analytical models used are shown to agree closely with 3D finite element analyses and also with experimental measurements made by Thiokol on a gaged propellant sample.
- Test Facilities, Equipment and Methods
- Solid Rocket Propellants