A-B Plane PG Throat Inserts

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Abstract:

An exploratory program was conducted to design and develop free standing a-b plane pyrolytic graphite throat inserts for rocket nozzles. Thermal analysis and structural analysis were conducted to define and establish design concepts for nozzle inserts. Free standing a-b plane continuously nucleated pyrolytic graphite cylinders were fabricated and characterized to determine the thermal and mechanical properties over range of temperatures from 70 F to 5000 F. Failure criteria were investigated and the predictions were compared with the results of pyrolytic graphite throat inserts which fractured during cooldown. The throat insert configuration was defined and thirteen deposition runs were made to produce the throat inserts. All inserts fabricated were unacceptable for nozzle testing due to cracks andor delaminations which occurred during cooldown.

Author(s):
Tomlinson, Philip A. ; Murray, James W. ; Bird, James O.
Author Organization(s):
ATLANTIC RESEARCH CORP ALEXANDRIA VA
Descriptive Note:
Interim rept. Dec 1974-Nov 1975
Pagination:
0474

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NDR-5649-4-76, AFRPL-TR-77-47
Contract/Grant Number(s):
F04611-75-C-0008
Task Number(s):
00
Project Number(s):
672A
Monitor Series:
TR-77-47, AFRPL
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_5.3.4_Develop Courses of Action; JCA_5.3.5_Analyze Courses of Action; JCA_5.3.3_Develop Strategy; JCA_1.2.6_Concepts; JCA_1.2.1_Training; JCA_1.2.5_Lessons Learned; JCA_1.3.2_Personnel Management; JCA_4.3_Maintain; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_4.4.1_Food Service; JCA_4.4_Logistics Services; JCA_1.2.7_Experimentation
Modernization Areas:
Microelectronics
Communities of Interest:
Air Platforms
Descriptor(s):
*NOZZLE INSERTS, *NOZZLE THROATS, *PYROLYTIC GRAPHITE, COOLING, CRACKS, FABRICATION, FAILURE, FRACTURE(MECHANICS), NUCLEATION, RESIDUAL STRESS, ROCKET NOZZLES, SOLID PROPELLANT ROCKET ENGINES, STRESS ANALYSIS, STRUCTURAL ANALYSIS, THERMAL ANALYSIS
Field(s)/Group(s):
Ceramics, Refractories and Glass, Solid Propellant Rocket Engines
Keyword(s):
DELAMINATION, PE63305A, WUAFRPL672A00HG
Report Date:
1978 Jun 01