Extremely durable plate?

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Extremely durable plate?

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Hatvan Kilenc	Hatvan Kilenc posted 9 Years Ago HOT Topic Details
Group: Forum Members Posts: 6, Visits: 91	Hi all! Any ideas how to construct an extremely durable plate (19,5 x 30 cm)? I have made few tests with different methods and the results have very promising but not good enough. The plate has to be so strong that it won´t break under a direct hit of an 170 g object hitting it in a speed of 180 km/h, impact energy will approx. 200 J. So far i have done plates from carbon and kevlar, few layers of carbon to give rigidity and to keep the plate in shape, in top few layers of kevlar to add strength. The question is should i put the kevlar only in top or also between carbon layers? Is 200 g carbon and kevlar strong enough? Should i put layers kevlar/carbon/kevlar/carbon/kevlar or kevlar/kevlar/carbon/carbon/kevlar on some other way? Plate will take hits only on the other side, so maybe more kevlar on that side? What about if i use some glass fibre instead of carbon fibre, Kevlar/kevlar/glass/carbon/glass?
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Fasta	Fasta posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 468, Visits: 3.5K	I would say either all Kevlar or a mix of Kevlar and fibreglass. Then it's just a matter of how thick? Carbon fibre is kind of like an ultimate stiffness material but it will not take shock and impacts as well as Kevlar or fibre glass. Fastacraft Facebook page
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D3O Phil	D3O Phil posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 22, Visits: 498	That is quite an impact 170g at 50m/s At those energies and velocities you will cause damage to anything therefore your 'plate' will be a one hit deal, I suspect your definitiaon of break should mean it won't penetrate through the plate to the other side? is your object pointy or blunt? as this makes a big difference as to the impacted area and load spread meaning you could get away with a thinner layup for what it's worth this sort of protection is typically 2 layers of fibre glass to create a rigid outer shell and approximately 15 layers of aramid behind to stop penetration.
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Hatvan Kilenc	Hatvan Kilenc posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 6, Visits: 91	Thanks for answers, the object is ice hockey puck, so it won´t penetrate through (i hope ). Thickness should be (or can be) 2-3 mm.
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D3O Phil	D3O Phil posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 22, Visits: 498	Ahh I wasn't expecting a hockey puck! Have you thought about creating the puck as a spiral like a snail or liquorice wheel rather than in layers? I suspect it might be more robust as you wouldn't be impacting the edges of the laminate
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Dravis	Dravis posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 592, Visits: 1.9K	Gneek ... I think you misunderstod the original poster .. Phil .. The Icehockey pPuck is the "projectile" -- What he wants to make is something that will stop the puck when fired at max velocity .. Because of the rather large and rounded "contact area" from the puck (The edges are the worst) What you need is something that is stiff enough to spread the impact over a larger area, so a combination of Kevlar and CF does not seem like such a bad idea .. "Sapere Aude"... Dare to KNOW! The written word is the only truly efficient vehicle for transmitting a complex concept from mind to mind... 103% of all people do not understand statistics... Do not adjust our mind, theres a fault in reality :-)
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D3O Phil	D3O Phil posted 9 Years Ago HOT Post Details
Group: Forum Members Posts: 22, Visits: 498	Ah Doh! The biggest factor for this would be the padding behind the plate then
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