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Large-displacement structural durability analyses of simple bend specimen emulating rocket nozzle liners

Author
Halford, Gary R.
Published
Jun 1, 1994.
Physical Description
1 electronic document
Additional Creators
Arya, Vinod K.
Online Version

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Summary
Large-displacement elastic and elastic-plastic, finite-element stress-strain analyses of an oxygen-tree high-conductivity (OFHC) copper plate specimen were performed using an updated Lagrangian formulation. The plate specimen is intended for low-cost experiments that emulate the most important thermomechanical loading and failure modes of a more complex rocket nozzle. The plate, which is loaded in bending at 593 C, contains a centrally located and internally pressurized channel. The cyclic crack initiation lives were estimated using the results from the analyses and isothermal strain-controlled low-cycle fatigue data for OFHC copper. A comparison of the predicted and experimental cyclic lives showed that an elastic analysis predicts a longer cyclic life than that observed in experiments by a factor greater than 4. The results from elastic-plastic analysis for the plate bend specimen, however, predicted a cyclic life in close agreement with experiment, thus justifying the need for the more rigorous stress-strain analysis.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19950006405.
Accession ID: 95N12818.
NASA-TM-106521.
NAS 1.15:106521.
E-8644.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15656778