yeah why not make something good for the environment out of an oil product oOWhy not plastic cardboard so sweat and rain would not be an issue?
http://www.alibaba.com/product-gs/554653777/Plastic_Polypropylene_PP_Cardboard.html?s=p
You act like a friggin' expert on cardboard. As if......PFffffftttt!bad idea. corrugate yields under load in a much different manner than expanded foams do. corrugate doesn't deform under load until within about 5-10% of its maximum strength. up until that point it just transfers the load without absorbing any of it.
You know I'm a package engineer right?You act like a friggin' expert on cardboard. As if......PFffffftttt!
Is that what you say to all the guys?You know I'm a package engineer right?
Perhaps a empty bucket and a can of expanding spray foam insulation?What about bubble wrap? Packing peanuts?
F'ing brilliant.Perhaps a empty bucket and a can of expanding spray foam insulation?
absolutely no oil was used in connection with the production of paper products. go make yourself a recycled soy organic hemp fair trade reclaimed paper hockey puck.yeah why not make something good for the environment out of an oil product oO
americans...
Am I actually about to just agree with something you've said..no....can't....do ...it...I'll just say I don't disagree instead..bad idea. corrugate yields under load in a much different manner than expanded foams do. corrugate doesn't deform under load until within about 5-10% of its maximum strength. up until that point it just transfers the load without absorbing any of it.
I learned it from a book... you can agree with the bookAm I actually about to just agree with something you've said..no....can't....do ...it...I'll just say I don't disagree instead..
Books can wrong as easily as they are right.I learned it from a book... you can agree with the book
It would be better the not deform until buckling begins from a head impact point of view. It is better to have a square wave deaccelleration verses time curve assuming limited distance because the peak deaccelleration is lower.bad idea. corrugate yields under load in a much different manner than expanded foams do. corrugate doesn't deform under load until within about 5-10% of its maximum strength. up until that point it just transfers the load without absorbing any of it.
Indeed it would be useful to not expend any potential energy absorption until a certain deemed acceleration is reached for the skull, BUT, buckling is an unstable phenomenon, once it buckles, it offers almost no resisting force=no energy absorption.It would be better the not deform until buckling begins from a head impact point of view. It is better to have a square wave deaccelleration verses time curve assuming limited distance because the peak deaccelleration is lower.
I'm sure the ribs are there to promote buckling. Other than that, I can't comment on the safety of this helmet without data. Is there something to keep it waterproof?
Indeed it would be useful to not expend any potential energy absorption until a certain deemed acceleration is reached for the skull, BUT, buckling is an unstable phenomenon, once it buckles, it offers almost no resisting force=no energy absorption.
So there'll be no energy absorption before it buckles (no movement, no energy expended), then it'll buckle during which there'll be a very quick transient in force, then it'll come right back up again as your skull bangs the inside of compacted cardboard while your still in the process of banging in to the ground.
What I'd really like to see is the acceleration/time graph from their tests, that's really what matters.
That's essentially what foam does I suppose, lots of local instabilities. A cardboard rib seems to just have a global buckling mode.I agree, I would like to see the graphs.
However, column buckling is one of the best methods of absorbing energy without mechanical storage of that energy. The absorber needs to be designed to continuously buckle rather than one buckle.
You won't get actual proper column buckling, the fluting doesn't function independently. It will buckle all at once, not continuously.I agree, I would like to see the graphs.
However, column buckling is one of the best methods of absorbing energy without mechanical storage of that energy. The absorber needs to be designed to continuously buckle rather than one buckle.
Which only illustrates the problems with the test standards.Whether its the ideal material or not, it passed the tests/standards for bike helmets.
Apparently it's 'good enough'.
Go try one out and report back to us, assuming you still have the cognitive function for speech.Let me know when your aspirin boxes pass bike helmet standards. Or moto (like this helmet did).
LOL So lots of head injuries eh?....... I'm beginning to understand now.Every time I have "used" my helmets I have had local bruising and abrasions. The cardboard helmet seems to have some pads but during a crash that thing would chew your head up something awefull.
You've not noticed my Barbie in a box jokes over the years? I'm gonna need to be a little less subtle.You know I'm a package engineer right?
Try not to be so transparent with your jealousy.yeah why not make something good for the environment out of an oil product oO
americans...