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Johny

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Sep 26, 2016
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Aluminium alloys are ligt and traditionally used, crystal dislocatons are locked by adding magnezium, zinc and others, in general they not support concentrated loads, are proned to accelate fatigue, in general they catastrofally fail whith some variations depend on composition, faster in cold atmospere.

I broke apart an experimental piece built in common aviation alloy in less than 3 secounds by scratcing it less ttan 0,3mm deed and 3 mm long by appling ultrasound, the piece craks internally.
In result any scatch must be removed.

Titanium alloys are sturdy, they heat up on dynamic overstress, not fail, the same piece in titanium not fail if it scratched, but titanium is twice heavier than aluminium, but is more than twice stronger, structure can be light as aluminium made one, but is rare and espansive, is poor heat conductor, but is better than composites.

Composites are light and strong and are not proned to fatigue, but fail catastrofally on overload, are poor electric conductors and can cath fire and burn.

Probably titanim, aramide or even long fiber asbest mashes can improve behaviour, aluminum mashes are allredy used to improve conductibility.
Aramide can be used as internal layers, not only as external reiforcement, probably it works better together long fiber asbest, mashes of carbon nanotubes are a great promise.
Also some organic polimers eg bilirbin based are exceptionally strong and can be used as mashes.

A sugestion of sanwitch: a core of carbon fiber, two layers of aramide and asbest, an envelope of carbon fiber and metalic mashes.

Composite can cath fire and burn, aluminium not withstand fire, but titanium withstand fire preety well.
 

Zsolt

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OK,
@Johny la primul mesaj nu am zis nimic, insa la al doilea simt ca trebuie sa intervin.
Ai ceva de transmis, esti doar un nou tip de bot, sau care este mesajul tau?

Ai timp pana luni sa raspunzi acestui mesaj, sau sa ma contactezi, in caz contrar contul tau va fi limitat.
 

Johny

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Sep 26, 2016
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Experimentul cu duraluminiul de aviatie si titanul este real si personal, am primit un ghid acustic de ultrasunete din duraluminiu cu suprafata lustruita si din gresala l,am lovit si s-a produs o mica zgarietura, in momentul cand am vrut sa-l folosesc s-a fisurat si s-a rupt in doua, de atunci am zis ca nu ma mai sui intr-un avion.

Concetratorul de ultrasunete era insotit de documente privind fabricarea si provenienta materialului, din curiozitata am dus fragmentele la analiza cristalografica la universitatea din Timisoara si le,am comparat cu alte mostre din acelasi aliaj, specialistii mi-au comunicat ca nu au gasit diferente structurale si nici defecte localizate.
Mai am si acum mostra din materialul respectiv, trebuie sa caut sa vad daca mai gasesc unul din fragmentele concentratorului caci unul l-am pastrat dar sunt vreo 12 ani de atunci totusi daca dau de el vi-l trimit sa-l studiati.

Am facut rost si de titan dar din pacate nu aliaj ci de inalta puritate am reprodus acel ghid acustic si am testat in aceleasi conditii, nu am reusit sa il fisurez in sute de ore de teste chiar si imersat in azot lichid.
Am si mostra din titan din care am facut concetratorul, dar concetratorul l,am donat Universitaii pentru un experiment, mai am unul mai mic facut din acelasi material.

A fost foarte scump, pe 500 g am dat 100 de dolari.
 
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Johny

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Sep 26, 2016
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Asa este, nu ma-m suit si nici nu ma voi sui in avion vreodata, am instalat o protectie cuantica pentru asta, si nimeni nu risca pagube majore in subconstientul colectiv pentru o treaba asa minora, fiecare cu optiunea lui, multumesc oricum ca v-ati purtat frumos cu mine la revedere.