Depleted Uranium Sword

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Depleted Uranium Sword May 9, 2009 3:00:39 GMT

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Post by Deleted on May 9, 2009 3:00:39 GMT

May 9, 2009 0:05:44 GMT @monkeybear said:

How dose gluing carbon fiber to the sides of the blade make it any stronger or lighter? More importantly how dose it increase speed?

I believe he glued it to the sides and spine.

Carbon fiber is about as good as you can currently get with strength/stiffness per unit weight. But it's brittle. So he used something light but tough, like titanium, for the cutting edge that sees the highest stress loading and then reinforced it with a carbon fiber spine to take most of the actual structure load that passes down the length of the sword.

It's ok for a fancy piece, but probably not the greatest design. Titanium doesn't actually hold an edge very well and carbon fiber doesn't take impact well. You start wacking that sword into things and you're going to be creating microfractures all through that composite wrap. You can't generally see them with the naked eye, but they show up beautifully under something like ultrasonic non-destructive evaluation. No thanks.

kidcasanova
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Depleted Uranium Sword May 9, 2009 21:56:06 GMT

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Post by kidcasanova on May 9, 2009 21:56:06 GMT

May 5, 2009 12:17:28 GMT Marc said:

Titanium is a poor choice for swords....

swordforum.com/metallurgy/titanium.html

Is Titanium stronger than steel, then? If the word "weight" is disregarded, many may conclude that titanium is indeed stronger due to its "superior strength-to-weight" ratio. However, except where weight is an issue such as in aircraft parts, steel is in most cases still a structurally superior material. In most applications, weight is somewhat less important than other factors. In knives, you want the material to be hardenable, so that it can hold an edge and cut. If the material you choose can't be hardened, then it doesn't matter what its other properties are like. For example, like titanium, aluminum also has a better strength-to-weight ratio than steel, but you certainly don't want a knife made out of aluminum! Aluminum and titanium are simply not the right materials for the purpose.

As mentioned above, where these materials are of use are in applications where weight is paramount and other properties are less important. But forgetting this for a moment, here's an example using some average values for titanium alloys and high carbon steels: A steel when hardened to RC 60 has tensile yield strength of 1,500 units/cross-sectional area (there are other more appropriate measures of strength for swords/knives, but we'll stick to tensile strength as an example), it also weighs 7,800 units per volume; an alpha-titanium alloy can be hardened to RC 40 and has yield strength of 850 units/cross-sectional-area and it weighs 4,500 units per volume. So, for a given volume of material at the hardnesses mentioned, the titanium is about half as strong and twice as light as the steel.

So you see that in order to have the same strength, the titanium bar must be made much larger in cross section than the steel, but because of its good strength-to-weight ratio, the much larger titanium bar would still lighter than the steel bar. Or, in other words, if the bars were exactly the same size, the titanium bar would be much weaker than the steel!! Ti alloys have superior strength/weight, but nobody said anything about strength/size!!

***Sword Forum Magazine Online

So, what you're saying is, Buster-sword fanboys should make it out of titanium? ;D ;D ;D

"Water buffalo, I like to use water buffalo for cutting targets and the goo goes everywhere." -- BrotherBanzai

What would Gimli do?

sbgswordforum.proboards70.com/index.cgi?board=designs&action=display&thread=8210
-My design thread. Check it out. ;D

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Depleted Uranium Sword May 11, 2009 3:58:03 GMT

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Post by Deleted on May 11, 2009 3:58:03 GMT

May 9, 2009 21:56:06 GMT kidcasanova said:

May 5, 2009 12:17:28 GMT Marc said:

Titanium is a poor choice for swords....

swordforum.com/metallurgy/titanium.html

***Sword Forum Magazine Online

So, what you're saying is, Buster-sword fanboys should make it out of titanium? ;D ;D ;D

In that case Buster-sword fanboys better have a good bit of money. How does one even work Titanium into something, anyway?

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