Accession Number:

AD0759968

Title:

Viscoelastic Analysis Method for Rocket Motors Containing Cracks.

Descriptive Note:

Technical rept.,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Lindsey,Gerald H.

Report Date:

1973-03-01

Pagination or Media Count:

58.0

Abstract:

The basic definitions for viscoelastic stress intensity factors are set forth with associated computations for determining them in laboratory specimens. Laboratory tests have been conducted to characterize propellants fracturewise. and the most suitable test found was the long strip subjected to a constant force loading. The influence of dewetting on the fracture characterization appears to be significant, but the matter has not yet been fully resolved. An approximate method for performing viscoelastic fracture analyses has been presented which incorporates the fore-mentioned fracture characterization. It requires minimum computer usage and should yield good results. Author

Descriptors:

• (*ROCKET PROPELLANT GRAINS
• VISCOELASTICITY)
• (*SOLID PROPELLANT ROCKET ENGINES
• CRACKS)
• SOLID ROCKET PROPELLANTS
• FRACTURE(MECHANICS)
• STRESSES
• CRACK PROPAGATION
• INTERIOR BALLISTICS
• MATHEMATICAL MODELS

Subject Categories:

• Solid Rocket Propellants

Distribution Statement:

APPROVED FOR PUBLIC RELEASE