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windsurfing - Materials Selection and Failure Analysis...

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Unformatted text preview: Materials Selection and Failure Analysis Materials Selection and Failure Analysis • 1 - skeg [fin] • 2 - daggerboard • 3 - board • 4 - sail battens • 5 - mast • 6 - uphaul • 7 - sail • 8 -mast foot [universal joint] • 9 - boom [“wishbone’] Materials Selection and Failure Analysis Materials Selection and Failure Analysis Performance Criteria for Windsurfer Masts Performance Criteria for Windsurfer Masts International Mast Check System [IMCS] • IMCS Number = L/ δ , where L = length of mast and δ is the deflection produced by suspending a 30 kg weight from the mid-point of the mast which is supported at its ends • L is typically 4.6 m • IMCS values vary between 20 [soft] and 32 [hard] • masts typically weigh between 1.8 and 3 kg Materials Selection and Failure Analysis Materials Selection and Failure Analysis Three Point Bending Test Three Point Bending Test for a circular cross section: for a circular cross section: • A = π r 2 • M = FL/4 • c = r • I o = π r 4 /4 = π 2 r 4 /4 π = A 2 /4 π • σ max = flexural strength or MOR = [FL/4][r]/[ π r 4 /4] = 3 F [30 kg] L = 4.6 m I Mc = σ σ Materials Selection and Failure Analysis...
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