SPRINGs - anamesin.lecture.ub.ac.idanamesin.lecture.ub.ac.id/files/2015/06/9-Springs.pdf · ELEMEN...
Transcript of SPRINGs - anamesin.lecture.ub.ac.idanamesin.lecture.ub.ac.id/files/2015/06/9-Springs.pdf · ELEMEN...
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SPRINGSELEMEN MESIN I
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PendahuluanSpring An elastic body, whose function is to
distort when loaded and to recover its original shape when the load is removed.
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Pendahuluan1. To cushion, absorb or control energy due to either shock or vibration as in car springs,
railway buffers, air-craft landing gears, shock absorbers and vibration dampers.
2. To apply forces, as in brakes, clutches and spring loaded valves.
3. To control motion by maintaining contact between two elements as in cams and followers.
4. To measure forces, as in spring balances and engine indicators.
5. To store energy, as in watches, toys, etc.
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Types of Springs Helical Springs
Conical and Volute Springs
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Types of Springs Torsion springs
Laminated or leaf springs and Disc or bellevile springs
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Spring Materials
High fatigue strength
High ductility
High resilience
Should be creep resistant
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Spring Materials
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Terms used in Compression Springs
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Terms used in Compression Springs Spring index
Spring rate
Pitch
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End Connections for Compression Helical Springs
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End Connections for Compression Helical Springs
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Stresses in Helical Springs of Circular Wire
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Stresses in Helical Springs of Circular Wire
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Stresses in Helical Springs of Circular Wire
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Stresses in Helical Springs of Circular Wire
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Deflection of Helical Springs of Circular Wire
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Buckling of Compression Springs
Buckling The free length of the spring (LF) is more than four times
the mean or pitch diameter (D)
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Buckling of Compression Springs
Table 23.4. Values of buckling factor
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Surge in Springs
Stress propagate along the spring wire
The applied load is fluctuating Resonance
Very large deflections and stresses of the coils and
correspondingly very high stresses
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Surge in SpringsThe natural frequency of spring should be at least twenty times the
frequency of application of a periodic load in order to avoid resonance with all harmonic frequencies up to twentieth order.
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Surge in Springs1. By using friction dampers on the centre coils so that the wave
propagation dies out.2. By using springs of high natural frequency.3. By using springs having pitch of the coils near the ends different
than at the center to have different natural frequencies.