Non-Destructive Laser Holographic Testing of Solid Propellant for Unbonding Defects,
Abstract
This paper describes the feasibility and sensitivity of using a laser holographic technique to detect unbonding defects in solid propellant rocket components. Conclusions: 1. Laser holography can detect the unbonding defects between the propellant, coating, insulating layer and shell. X-ray could not detect such defects in similar specimens. 2. The sensitivity of detection depends on the H/d ratio. The ratio is around 2.9 for the propellant. When the H/d ratio is equal to or less than this value, even 1 mm diameter unbonding defects can be detected. 3. The value of H/d is related to the nature of the material (modulus of elasticity). The H/d value of the coat is around 0.7. 4. The sensitivity of detection also depends on the gas content at the defect. The sensitivity of detecting an unseparated defect is decreased by more than one half of that of detecting a separated defect. (Translations, China, Chinese Language)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 15, 1986
- Accession Number
- ADA163694
Entities
People
- Yongbao Wang
Organizations
- National Air and Space Intelligence Center