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From: Steve & Anne Price
Date: Wed, 9 Oct 1996 22:51:46 -0500 (CDT)
Subject: Re: Break-in & coaxing

On Wed, 9 Oct 1996 WVE~ol.com wrote:

> "IF a specimen is tested without failure for a LARGE NUMBER of cycles below
> the fatigue limit and the stress increased in SMALL INCREMENTS after allowing
> a LARGE NUMBER of cycles to occur at each stress level, it is found that the
> resulting fatigue limit may be as much as 50 percent greater than the initial
> fatigue limit. This procedure is known as COAXING. An extensive
> investigation of COAXING (G. M. Sinclair, American Society of Testing
> Material, Proceedings vol.52, pp 743-758, 1952) showed a direct correlation
> between a strong coaxing effect and the ability for the material to undergo
> strain aging. Thus, mild steel and ingot iron show a strong COAXING effect,
> while BRASS, aluminum alloys, and heat-treated low-alloy steels show little
> improvement in their properties from COAXING."

THANK YOU for that ILLUMINATING and INTERESTING quotation, VERN. I was,
as you know, CURIOUS about that bit of BUSINESS. I'd still be interested
in an actual EXPLANATION, albeit in lay terms, about how COAXING is
thought to work. What is "strain aging"?

Steve Price