Life prediction of TMCS under mission spectrum loading
- Wright Lab. Materials Directorate, Wright-Patterson Air Force Base, OH (United States)
Fatigue life predictions are conducted for a SCS-6/Timetal{reg_sign}21S [0/9] 2S composite under a generic hypersonic profile. The analysis is based on micromechanical stresses computed using a uniaxial stress model incorporated into the FIDEP computer code. The 0{degrees} lamina are represented as an elastic fiber within a viscoplastic matrix, while the 90{degrees} lamina are treated as a homogeneous viscoplastic material with damage to match experimental data as well as finite element computations. The spectrum loading is decomposed into a series of in-phase and out-of-phase thermomechanical fatigue (TMF) segments whose lives are predicted from a model which has been developed for isothermal and TMF data. The modeling extends that developed in a prior investigation for unidirectional composites to the cross-ply configuration. The micromechanical stresses are obtained for the TMF segments as well as for the entire mission profile and compared with each other at the end points of the TMF segments. In addition, simplified missions are also analyzed using the same procedures. The analytical predictions for the mission spectrum and the simple mission profiles are compared with experimental data obtained in a previous study by Mirdamadi and Johnson. An assessment of the capability of the model to predict fatigue life under mission spectrum loading based on calibration under simple isothermal fatigue and TMF conditions is made.
- OSTI ID:
- 175284
- Report Number(s):
- CONF-950686--
- Country of Publication:
- United States
- Language:
- English
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