Posted: Mon Apr 18, 2005 1:39 pm
Spoken like a wise metalurgical engineer.dhoyne wrote:I think it's a matter of how fast the bolt is loaded. A standard tensile or compression (and even Rick's testing and the UIAA testing) applies fairly slowly. This allows a material to slowly increase its strain until it first hits its yield point, then eventually its ultimate tensile/compression strength. In real life, we don't load bolts slowly; it's a VERY fast load. There is almost no time for a material to deform at its yield point as it is quickly strained to its ultimate(breaking) point.the lurkist wrote:Is it plausible that the "soft" quality of the corbin sandstone actually acts as a buffer or shock absorber, allowing the bolt to fall back on its tensile qualities as it deforms down as the rock crushes under it?
One test we hope to do sometime is to drop a huge load off a cliff with a chain attached to a standard bolted hanger. That would be a worst case scenario for shock loading.
Rick