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#290948 - 10/24/18 01:36 PM Re: Arizona Mine Rescue [Re: hikermor]
chaosmagnet Offline
Sheriff
Carpal Tunnel

Registered: 12/03/09
Posts: 3691
Loc: USA
Tjin: “Fatigue” is certainly the correct English term for how metal parts gain small stress fractures over time and lose strength as a consequence.

I’m no metallurgist but I believe you’re correct that aluminum suffers from fatigue at almost any loading (albeit small amounts).

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#290950 - 10/24/18 02:44 PM Re: Arizona Mine Rescue [Re: Tjin]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 7690
Loc: southern Cal
While not practical for mountaineering situations, my favorite rappel device is the rappel rack;

https://www.rocknrescue.com/product/smc-nfpa-long-6-bar-rappel-rack/

Developed in 1967 and enhanced/improved since then, it is safe and relatively foolproof.

Most of my rappels lately have been down sea cliffs abd canyon walls to retrieve fossils, which I suppose is a relatively specialized use - also used by window washers, etc...
_________________________
Geezer in Chief

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#290954 - 10/24/18 06:17 PM Re: Arizona Mine Rescue [Re: hikermor]
clearwater Offline
Old Hand

Registered: 03/19/05
Posts: 1174
Loc: Channeled Scablands
Here is one of the first dog leg carabiners. They were a marvel on quick draws when they first came out. Notice how a gate pin at the notch just fell out. I got rid of the batch after that happened.

[img:left]https://blog.owareusa.com/#jp-carousel-1627[/img]

Can't seem to get the image to show. Anyone have suggestions?


Edited by clearwater (10/24/18 06:19 PM)

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