NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
Development of a simplified procedure for rocket engine thrust chamber life prediction with creepAn analytical method for predicting engine thrust chamber life is developed. The method accounts for high pressure differentials and time-dependent creep effects both of which are significant in limiting the useful life of the shuttle main engine thrust chamber. The hot-gas-wall ligaments connecting adjacent cooling channels ribs and separating the coolant flow from the combustion gas are subjected to a high pressure induced primary stress superimposed on an alternating cyclic thermal strain field. The pressure load combined with strain-controlled cycling produces creep ratcheting and consequent bulging and thinning of these ligaments. This mechanism of creep-enhanced ratcheting is analyzed for determining the hot-gas-wall deformation and accumulated strain. Results are confirmed by inelastic finite element analysis. Fatigue and creep rupture damage as well as plastic tensile instability are evaluated as potential failure modes. It is demonstrated for the NARloy Z cases analyzed that when pressure differentials across the ligament are high, creep rupture damage is often the primary failure mode for the cycle times considered.
Document ID
19840011404
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Badlani, M. L. (O'Donnell and Associates, Inc. Pittsburgh, PA, United States)
Porowski, J. S. (O'Donnell and Associates, Inc. Pittsburgh, PA, United States)
Odonnell, W. J. (O'Donnell and Associates, Inc. Pittsburgh, PA, United States)
Peterson, D. B. (O'Donnell and Associates, Inc. Pittsburgh, PA, United States)
Date Acquired
September 4, 2013
Publication Date
October 1, 1983
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NASA-CR-168261
NAS 1.26:168261
ODAI-1512-11-83
Accession Number
84N19472
Funding Number(s)
CONTRACT_GRANT: NAS3-23343
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available