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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - December 26, 1970, Lethbridge, Alberta ICi 'fl-ir IFMIBRIUGP IIEKALB Snlutdny, December 26, w laidiy OTTAWA K'T' A National Research Council Mudy sug- gests current tests for nir- I'l-afl. wheel fatigue overlook important safely factors. "No apparent consideration nas been given iu iJit: (itivtrinc effects of such parameters as landing impact toads, stresses in hubs due to brake ap- plication, landing side loads and excess lire pressure to name a says the study. Cm-rent fatigue tests for air- craft wheels arc mainly "roll tests'1 under which a wheel must be able to roll 1.000 miles without failure nr developing cracks under maximum loads. For military craft, tliis may be 1.500 miles with a scries of landings or continuous roll of I fire and wheel against a rotat-1 The' NRC shirty, by William i Wiebe of the National Asronau- i tical Establishment, says that j substantial fatigue damage' may occur trom kuiding ini- pac't stress and brake applica- tions. Study of wheel fractures with the electron microscope shows that in many instances corro- sion plays a 'significant role in starting cracks and in the early stages of crack growth in the wheel metal. Some airlines are trying to find new types of paints to pro- tect ngainst Ibis corrosion. Testing also is going