Design and Stress Analysis of Extraterrestrial ... - The Black Vault

made over a frequency range from 5 to 3000 Hz with maximum loading
up to 25 g,
simulating the conditions of orbit injection.
Figure 3.14 shows a sketch of a turbogenerator layout.
Stress analysis of working blades
The turbine blades are the most stressed and critical parts of
a turbine unit. They operate at high temperatures and experience
high mechanical loads from centrifugal and gas-dynamic forces.
Furthermore, the blades experience secondary stresses from the
transiency of operating conditions with rapid time variation in the
thermal condition ("thermal shock") and also from the mechanical
vibrations of the blade foil (especially in the presence of
resonance).
The determination of tensile stresses in
blade foil from centrifugal forces
the
Under the effect of centrifugal forces in the blade foil there
will appear torsional, flexural, and tensile stresses, of which
the basic stress is tensile stress.
F Cn
(t)
Fig. 3.15. Coordinate system. Fig. 3.16. Streso analysin of
blade.
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