12.1 Weightefficient flywheel

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12.1 Weight-efficient flywheel
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?f 0.2 yield stress for metals 1 yield
stress for polymers crushing stress for ceramics.
Materials Selection in Mechanical Design. M.F.
Ashby , Butterworth-Heinemann, 1992.
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Materials for weight-efficient flywheel
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12.2 Comparing volume efficiency and mass
efficiency
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?f 0.2 yield stress for metals 1 yield
stress for polymers crushing stress for ceramics.
Materials Selection in Mechanical Design. M.F.
Ashby , Butterworth-Heinemann, 1992.
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12.3. Yielding limited selection-IIMaterials
for compressor blades
B.H. Kear, Scientific American, 1987
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• Function to produce large air flow
• Light weight
• Impact resistant

• Heating by compressed air
• Fatigue
• Radius fixed by design

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?f 0.2 yield stress for metals 1 yield
stress for polymers crushing stress for ceramics.
Materials Selection in Mechanical Design. M.F.
Ashby , Butterworth-Heinemann, 1992.
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Material selection for compressor blade
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Material of choice Ti alloys.
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12.4. Yielding limited selection-III Materials
for an elastic hinge

• Large elastic deformation
• Bent to small radius
• Fatigue resistant

Materials Selection in Mechanical Design. M.F.
Ashby , Butterworth-Heinemann, 1992.
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Materials Selection in Mechanical Design. M.F.
Ashby , Butterworth-Heinemann, 1992.
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Materials for elastic hinges
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Materials for elastic hinges
Plastic hinges can be molded together with the
rest of the component.
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12.5. Review of yielding limited selection