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Commissioned Report on Indiana Fair Tragedy
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<blockquote data-quote="Phil Graham" data-source="post: 50627" data-attributes="member: 430"><p>Re: Commissioned Report on Indiana Fair Tragedy</p><p></p><p></p><p></p><p>Matt,</p><p></p><p>Aluminum alloys exhibit "low cycle" fatigue life behavior, but they don't really have a fixed degradation with age. Aluminum is reasonably chemically stable against corrosion, so there's not a huge chemical reaction component.</p><p></p><p>I forget the gory details of aluminum fatigue life, but I do remember that welds for common alloys like 6061 can be susceptible to it on comparatively low number of loadings (<10e4).</p><p></p><p>Routine truss inspection by standard metallurgical means would be a very good idea for the industry.</p></blockquote><p></p>
[QUOTE="Phil Graham, post: 50627, member: 430"] Re: Commissioned Report on Indiana Fair Tragedy Matt, Aluminum alloys exhibit "low cycle" fatigue life behavior, but they don't really have a fixed degradation with age. Aluminum is reasonably chemically stable against corrosion, so there's not a huge chemical reaction component. I forget the gory details of aluminum fatigue life, but I do remember that welds for common alloys like 6061 can be susceptible to it on comparatively low number of loadings (<10e4). Routine truss inspection by standard metallurgical means would be a very good idea for the industry. [/QUOTE]
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