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Inspecting Standing Rigging
GBM wrote:
"cavelamb" wrote Just a suspicion, but it seems to me that the problem here is a result of the swaging process itself. When the swage is squeezed, there should be uneven compression which would cause the material to yield unevenly - leading to rather high localized stress concentrations. In-service vibration, over time, should lead to exactly the kind of cracks described by GBM. FWIW, for highly stressed aircraft cables, the terminals (ends) are *Rolled* rather than squoze... Richard Could be, but experience shows that this type of failure does not occur in fresh water. The experts advise that it is the presence of chlorides in crevices with an oxygen deficient atmosphere and stress that cause the failure. The whole swage and the wire strands are stressed to various degrees. GBM Capillary action would draw water up the wires and into the fittings. Sea water there would be a bad thing (tm) that would aggressively attack the small surface fractures in the fitting. Your point about sealing the swedged fitting with epoxy should reduce the susceptibility quite nicely just by sealing the open end of the wire and fitting. Keep the nasty old sea water out of those tender places... Richard |
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