Obstacles to High Temperature Cyclic Structural Durability of Continuous-Fiber MMCs
Increases in high temperature cyclic structural durability are being sought constantly. Materials for the next generations of machines must be designed to resist higher stresses and strains, and for elevated temperature use, must also resist time-dependent, thermally-activated damage mechanisms such as creep and oxidation. If mission usage involves temperature excursions, thermal-gradient induced stresses and strains will be superimposed on mechanical stresses and strains. The combined strains adversely interact with environmental attack mechanisms. The end result is a complex cyclic variation of strain, stress and temperature, with time-dependent creep, diffusion, oxidation, etc.
KeywordsBurner Fatigue Titanium Nickel Tungsten
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