Problem $1$: Plasticity$/$Creep in Engineering Design

One important aspect of designing a robust and reliable gas engine turbine blades for aerospace applications, for

instance, is the high cycle fatigue. The role of plastic deformation in such material $($usually metals$)$ under such

environment is significant. These questions below focus on the role of plasticity in the materials for engineering

design, so only the plasticity considerations are needed.

a$)$ Consider the nominal operational temperatures of turbine blades are in the range of $1500-1900$C$.$ Metals

are known to creep at such high temperatures. What are the basic deformation mechanisms involved

here $(10$ points$).$

b$)$ Because of the very high precision of the applications of gas engine turbine blades in aerospace, any

movement of the material should be minimized. Knowing this, describe the general strategies to make

materials of the gas engine turbine blades more creep$-$resistant $(10$ points$)$ Problem $1$: Plasticity$/$Creep in Engineering Design

One important aspect of designing a robust and reliable gas engine turbine blades for aerospace applications, for instance, is the high cycle fatigue. The role of plastic deformation in such material $($usually metals$)$ under such environment is significant. These questions below focus on the role of plasticity in the materials for engineering design, so only the plasticity considerations are needed.

a$)$ Consider the nominal operational temperatures of turbine blades are in the range of $\backslash (1500-1900^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash ).$ Metals are known to creep at such high temperatures. What are the basic deformation mechanisms involved here $(10$ points$).$

b$)$ Because of the very high precision of the applications of gas engine turbine blades in aerospace, any movement of the material should be minimized. Knowing this, describe the general strategies to make materials of the gas engine turbine blades more creep$-$resistant $(10$ points$).$