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Mike - Skis - Coggle Diagram
Mike - Skis
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Ski cross section :ski:
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2 and 6. Continuous composite fibres - fibre orientation controls bending and torsional stiffness, often surrounds core
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- Low density core, laminated wood or foam
- Rubber seal to prevent water
- Metal Edge - Wear resistant
- High Mw polyethylene base for low friction, slightly porous for wax application
Damping
Clamped-free
One end on shaker, other end on accelerometer
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Three measurement methods, 1 and 2 are clamped free and free free
When frequency is turned off, time for vibrations to dissipate is measured
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- Forced non resonance DMTA
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Resonant frequency is inversely proportional to length, several lengths should be tested
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ASTM Standards :flag-us:
Flexural Stiffness
Ski is placed on two rollers at 'contactpoints', force applied to deflect point M by 1cm
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Same process can be applied to from and rear of ski, with centre clamped and force on edges
Torsional Stiffness
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Subject to torsional force of 20N.m, resulting angle recorded
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Wax chemical structures
Petrolatum
Low Tm @ 50C, C20-C28, straight chain
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High Tm @ 100C, C25-C35, Branched chain
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Mode shapes, resonant frequencies and claming geometry
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