PSI charts

[seanr9ne]

i heard u guys sayign that the PSI rating for shafts isnt very valid....why is that?

because i have a friend wanting to buy a kpro because its 20 grams lighter and 9,000 psi stronger than a klite and im trying to talk him into not wasting his money

sooo why doesnt it matter

[LaxMVP25]

lets see if i can get this right,

because the psi is measured when you stand the shaft up tall not laying on its side wich would be relavent to lacrosse. but i think that as long as you compare psi's of the same metals your fine

[WestSideLa X eR]

because i broke a levitation with an f15

I dont think psi is measured in a way thats relevant to lacrosse, but im not sure

[RockStar]

I I think they just measure tensile yield stress to get that PSI number (i.e. they pull on the shaft until it yields and won't return to its original length).

Although that number gives a decent idea of the strength of the material, it doesn't necessarily reflect real toughness. That's a function of both the material, the size and shape of the cross section, and the length of the stick.

Lacrosse sticks are very rarely stressed in pure tension under game conditions. What would be better numbers would be

-compressive flexural stress at failure (i.e. how hard can I crosse check someone before it turns into a U), or,

-hardness and impact resistance (i.e. how hard can I slash someone's stick before I get a severe dent or crack).

The moral of this story is save your money and just get a solid, basic shaft that's fairly light. Think about it - for the price of some of the designer alloys, you can get like 3 F-15s.

[statboy2]

Here's the deal. The PSI is a measure of how strong the alloy used to make the shaft is, not how strong the actuall shaft is.

For instance, if you look at the texlax table, you can see that the Brine F22, made of c405, weighs 6.4 ounces where as the warrior klyte c405 weighs 5.8 ounces. This is because Brine used more c405 to make the F22 than warrior did to make the klyte, so the F22 is heavier and stronger.

The kpro is made of c555, which has a PSI of 98000 where as the klyte is made of c405, which has a psi of 89,000. This does not necessarily mean the kpro is stronger because different amounts of each alloy are used to make each shaft. Overall, you can't really determine which one is stronger unless you ask warrior, but the klyte is probably a better deal.

[stxlcr18]

i dont look at psi i look at strenght to weight ratios

[LSMiddie]

Originally posted by seanr9ne
i heard u guys sayign that the PSI rating for shafts isnt very valid....why is that?

because i have a friend wanting to buy a kpro because its 20 grams lighter and 9,000 psi stronger than a klite and im trying to talk him into not wasting his money

sooo why doesnt it matter

means nothing on the field

[LaxGoalieLZ]

dont go with a klyte or a kpro go with a db803, once you get one you never go back

[Alex]

See thread: Lightest known shaft

[statboy2]

The reason why the 803 is so light is that debeer makes certain part of the shafts thinner (so less alloy is used and the shaft is lighter). This makes for the lightest shaft on the market but it also makes for a shaft that is very weak in certain spots.

[RYU]

Originally posted by stxlcr18
i dont look at psi i look at strenght to weight ratiosI hope you haven't taken HS Physics yet, because tensile strength is a measure of a material's strength to weight ratio. I.e. One oz/kg/ton of Ti 3Al-2.5V alloy will fracture at 135K PSI. One oz/kg/ton of Alcoa CU31 7000 series Al alloy will fracture at 82K PSI.

As has been brought up in previous threads, tensile strength numbers don't mean a whole lot to us laxers, because the tensile strength tests are conducted by pulling and stretching metal apart like taffy.

I recommend going over this thread from a few days ago:
Thread - Strength and Weight of Shafts (http://www.lacrosseforums.com/showthread.php?s=&threadid=6079)

Mods, can we make a sticky out of this or something?

[lzlax09]

Originally posted by RYU
I hope you haven't taken HS Physics yet, because tensile strength is a measure of a material's strength to weight ratio. I.e. One oz/kg/ton of Ti 3Al-2.5V alloy will fracture at 135K PSI. One oz/kg/ton of Alcoa CU31 7000 series Al alloy will fracture at 82K PSI.

As has been brought up in previous threads, tensile strength numbers don't mean a whole lot to us laxers, because the tensile strength tests are conducted by pulling and stretching metal apart like taffy.

I recommend going over this thread from a few days ago:
Thread - Strength and Weight of Shafts (http://www.lacrosseforums.com/showthread.php?s=&threadid=6079)

Mods, can we make a sticky out of this or something?

check mate b!otch:bye