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#1 | |
Member
Join Date: Dec 2012
Posts: 33
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Wow superb pictures. dont mind if i use them elsewhere, will ya? ![]() |
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#2 |
Member
Join Date: Dec 2004
Posts: 1,247
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I don't know if you can see this thread without being a member of bladeforums, but here's the blade forums link.
The analysis is also posted here on Google Docs, which requires you to have a Google account. In reading the Google version, I'll admit that I was wrong, in that the geometry does matter somewhat. A simple semi-circular cutout reduces the stress the most, and sharp angles bring the stress levels back up, where the sharp angles occur. Hope this helps, F |
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#3 |
Member
Join Date: Dec 2004
Posts: 1,712
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Thanks Fearn interesting,,,A fascinating read.
As the auther says though.... "I did not use real values for the geometry. I used generic structural steel material properties and did not account for the variation in modulus from the differential heat treatment or hardening. I did not check for mesh convergence, or verify my results were in accordance with the beam equations. I did not apply realistic loading conditions. In other words, please take these results with a grain of salt!" As many of those factors are critical in the design & forging of kukris I think his advice to take with a grain of salt is correct. But Many good points raised especialy re. reduction in transmited shock & vibration I think. I hadnt considered that before. I am sure thats a valuable hypothisis. Spiral |
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#4 |
Member
Join Date: Dec 2004
Posts: 1,247
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There's a master's thesis waiting to be written here, really.
A few of things that can be done: 1. Creating a proper model of a khukuri, with the three dimensional shape, bend, and differential hardening of the cutting edge. 2. Playing with the tip angles, blade size, bend angle, thickness, cho shape, etc., to see how these affect the properties of the blade. There's such a variation in khukuri shapes and sizes that someone really could have a lot of fun. If there are simple conclusions, they could even feed these back to the kamis who make those blades, so that the kamis could play with new blade shapes suggested by the model. Best, F |
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#5 |
Member
Join Date: Mar 2006
Location: Room 101, Glos. UK
Posts: 4,215
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fearn,
i fixed the missing tacoma narrows video at bladeforums ![]() |
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#6 |
Member
Join Date: Dec 2004
Posts: 1,712
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Thanks Fearn, Kronckew.
All good stuff! Spiral |
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#7 |
Member
Join Date: Feb 2005
Location: England
Posts: 373
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These three have by far the most common kaudi
But many early kukri didn't have kaudi at all, this kukri of Prithvi Narayan Shah, potentially lends itself to the blood dripping theory near the bolster; ![]() Even the Gurkhas are unsure about its signifigance, check 13.36 in on the vid; Gurkhas 'In the Highest tradition' |
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