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From: WVE~ol.com
Date: Thu, 17 Oct 1996 13:39:33 -0400
Subject: Re: coaxing and strain aging

In a message dated 96-10-14 16:13:35 EDT, jdd writes:

>Which it still might be. I don't think that we have yet devoted
>sufficient attention to the issues of riveting and stamping/finishing of
>the reed plate. I worked for a number of years for a company which made
>a variety of small oscillating mirrors which mounted on ferrous reeds
>vibrating in the 200Hz to 2kHz region. Brinnelling, scraping, spalling
>and possibly even electrochemical effects on the reed at the clamping
>point were nagging problems. Brinneling is likely restricted only to
>ferrous alloys, but scraping of the reed on nearly invisible stamping
>dross could be one possible failure mechanism. Loosening of the rivet
>compression is another candidate. I'm not suggesting anything
>definitive, only that as I'm sure you'll agree there are still
>second/third/fourth order effects to be explored which might account for
>observed reed break-in.
>
You mention problems that might account for failure. Did any of them improve
with gentle cycling when the part was new?

Vern