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A ropey issue
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<blockquote data-quote="Cleon" data-source="post: 8144150" data-attributes="member: 57383"><p>Ropes have a yield point beyond which they stretch and weaken too, obviously, but unfortunately my casual internet browsing has failed to find any information on what that is for hemp or manila, so your guess is as good as mine as to when an SRD hempen rope is likely to permanently stretch.</p><p></p><p>Wikipedia's <a href="https://en.wikipedia.org/wiki/Yield_point" target="_blank"><strong>Yield (engineering)</strong></a> page quotes spider silk as yield strength 1150 MPa and breaking strength 1400 MPa. That indicates its resistance to plastic deformation is better than all but the most elastic steels, since it can take up to 82% its breaking load and bounce back to normal. Incidentally, that breaking strength seems a bit high - most sources I've seen quote 1000 to 1100 MPa for typical dragline silk, although a few species can do better than that (like the aforementioned <a href="https://en.wikipedia.org/wiki/Darwin%27s_bark_spider" target="_blank"><strong>Darwin's bark spider</strong></a>).</p><p></p><p>EDIT: Further on the above, I suspect Wikipedia's 1400 MPa spider's silk may be based on the silk of the <a href="https://en.wikipedia.org/wiki/Nephila_pilipes" target="_blank"><strong>giant golden orb weaver</strong></a> (<em>Nephila pilipes</em>), a species noted for particularly strong silk as per <a href="https://bio.biologists.org/content/7/2/bio029249" target="_blank"><strong>this paper</strong></a>. Note that paper also studied the silk of the <a href="https://en.wikipedia.org/wiki/Trichonephila_plumipes" target="_blank"><strong>tiger spider</strong></a> "<em>Nephila</em> <em>plumipes</em>" (now renamed <em>Trichonephila plumipes</em>) whose webs are of more typical strength - the <a href="https://bio.biologists.org/content/biolopen/7/2/bio029249/F2.large.jpg?width=800&height=600&carousel=1" target="_blank"><strong>Strain-Toughness/Stress Diagram</strong></a> shows the golden orb's silk reaching 1600 MPa while the tiger spider barely manages 900 MPa.</p><p></p><p>For comparison, Grade 70 steel can take somewhere between 32% to 36% (159/485 - 221/620); 5160 spring steel can take 63% (yield strength divided by tensile strength is 650/1,025), while Eglin steel can take 85% (1547/1818).</p></blockquote><p></p>
[QUOTE="Cleon, post: 8144150, member: 57383"] Ropes have a yield point beyond which they stretch and weaken too, obviously, but unfortunately my casual internet browsing has failed to find any information on what that is for hemp or manila, so your guess is as good as mine as to when an SRD hempen rope is likely to permanently stretch. Wikipedia's [URL='https://en.wikipedia.org/wiki/Yield_point'][B]Yield (engineering)[/B][/URL] page quotes spider silk as yield strength 1150 MPa and breaking strength 1400 MPa. That indicates its resistance to plastic deformation is better than all but the most elastic steels, since it can take up to 82% its breaking load and bounce back to normal. Incidentally, that breaking strength seems a bit high - most sources I've seen quote 1000 to 1100 MPa for typical dragline silk, although a few species can do better than that (like the aforementioned [URL='https://en.wikipedia.org/wiki/Darwin%27s_bark_spider'][B]Darwin's bark spider[/B][/URL]). EDIT: Further on the above, I suspect Wikipedia's 1400 MPa spider's silk may be based on the silk of the [URL='https://en.wikipedia.org/wiki/Nephila_pilipes'][B]giant golden orb weaver[/B][/URL] ([I]Nephila pilipes[/I]), a species noted for particularly strong silk as per [URL='https://bio.biologists.org/content/7/2/bio029249'][B]this paper[/B][/URL]. Note that paper also studied the silk of the [URL='https://en.wikipedia.org/wiki/Trichonephila_plumipes'][B]tiger spider[/B][/URL] "[I]Nephila[/I] [I]plumipes[/I]" (now renamed [I]Trichonephila plumipes[/I]) whose webs are of more typical strength - the [URL='https://bio.biologists.org/content/biolopen/7/2/bio029249/F2.large.jpg?width=800&height=600&carousel=1'][B]Strain-Toughness/Stress Diagram[/B][/URL] shows the golden orb's silk reaching 1600 MPa while the tiger spider barely manages 900 MPa. For comparison, Grade 70 steel can take somewhere between 32% to 36% (159/485 - 221/620); 5160 spring steel can take 63% (yield strength divided by tensile strength is 650/1,025), while Eglin steel can take 85% (1547/1818). [/QUOTE]
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