Springs 101: Failing grade - Saab 9-5 Bulletin Board - Saabnet.com
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Springs 101: Failing grade
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Posted by Stephen Goldberger [Email] (more from Stephen Goldberger) on Wed, 12 Jul 2017 11:03:10 Share Post by Email
In Reply to: New springs are not the answer, bobc [Profile/Gallery] , Wed, 12 Jul 2017 10:16:37
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It's not the quality of the steel but the basic design of the spring. Spring design 101: If the proposed design takes a set (i.e., yields) at maximum compression (or forced extension), you must add turns (to reduce the stress at maximum compression to below the yield stress) and either make the spring diameter larger or use larger diameter wire to maintain the required stiffness.

Spring design 102: you can sometimes squeak by on a marginal design by "prestressing" the spring. If the spring is compressed as flat as possible, only the outer portion of the wire goes into yield. Let the spring relax completely and the outer portion is stressed in the opposite direction of the yield strain while the inner part is stressed in the direction of yield. Compress the spring "flat" again, and there is no further yield. But the completely relaxed length of the spring is now smaller than it originally was. Which would require spacers to restore the original function. Or relocated spring mounts.

Note that the spring rate remains the same in all the above scenarios. You would have expected s***t like this to happen back when Saab had a couple or three dozen engineers on the job, not while it was supported by the engineering prowess of GM. But then they did have an art history major put in charge of ignition switch design...

posted by 69.133.17...

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