/sci/ - Science & Math

>>12344297
It is wood that is denser than normal wood. About 2 times denser actually

>>12344297
>the military is very interested
Any idea what application they have in mind?

There was talk a few years ago about building skyscrapers out of it but that doesn't seem to have gone anywhere.

>>12344355
if it still rots like normal wood then it is dumb to use it as a structural element to make scyscrapers imo

Yes, its a very interesting material.

>>12344487

Properly treated wood does not rot.

>>12344487
Huh? Are you not aware of treated wood houses lasting centuries?

>>12344351
Tactical treehouses

>>12344563
sailboats are back.

>>12344487
>rots like normal wood
Pic. related is made from normal wood at a time when tech was not terribly high. And it has lasted longer than most modern buildings ever will.

>>12345347

>>12344351
densified bonfires

>>12344563
>I didn't invent the treehouse, Lana, but I was the first person to realize its potential as a tactical outpost. The tactical treehouse, Lana! The... tactihouse.

>>12344297
It seems it would make excellent loudspeaker boxes.

>>12345369
Nigger

>>12345368
reddit

>>12344543
You mean houses that are rebuilt like Theseus fucking ship.

>>12345347
Put a termite there you fucking nigger.

>>12344355
Does jet fuel melt densified wood?

>>12345368
go away faggot

>>12344297
Ask your mom, anon

>>12345380
Incorrect.

>>12345406
suck my dick faggot

>>12344351
clubs

>>12345406
>faggot
>>12345554
>faggot
Why the double homophobia?

>>12344351

>>12345850
Faggot

>>12345377
That was uncalled for.

>>12345881
Double Nigger

>>12345901
What is your problem with loudspeaker boxes?

>>12344487

Well, I don't really know, but I'm going to go out on a limb and say that since that wood is not porous it won't acumulate water as easily as other wood and neither air will. That means that it won't go through cycles of expansion/reduction nor microorganisms be able to decompose it as easily.

>>12344351
Trenches, and other fortifications, metal is expensive

>>12345912
Nothing, just giving you shit. Actually I've got some really fucking nice ones I inherited from my dad after he moved a few years back. Pair of corner units with built-in subs, six foot, solid oak panels - heavy as fuck, but super durable and look great and the speakers themselves are still in great condition (though I think my old man may have gone a bit deaf from years of blasting tunes).

All-in-all it's a really interesting concept from a material standpoint. If you could successfully densify wood paneling you could probably produce super light or super low-profile furniture (loudspeaker boxes included) without them being cheap and shitty like particle-board flat pack crap. Imagine making a desk, table, bookshelf, etc that's only a few millimeters thick but has the same durability and weight capacity as a slab of steel.

>>12345988
This is wood that has been reduced in volume and treated later. How is, in this day and agen, be less expensive than a simple sheet of metal?

>>12346015
Metal doesn't grow on trees, anon.

>>12346015
>a simple sheet of metal

look into the amount of energy and raw material inputs required to make a 1kg ingot of aluminum or steel from ore

>>12346020

FUCKING Carlos

>>12346020
god dammit

>>12345401
Melt? No, that's only for the World Trade Center. IIRC, the wood could burn but it would be very difficult to do because it is so dense that only the surface can get charred. You'd need some kind of accelerant, like perhaps jet fuel, to keep the fire going. Densified wood on its own won't sustain a fire.

>>12346020
For a country like the US, this is an important point. One thing the US has plenty of is woodlands and they are renewable. The US make about 1/10th as much steel as does China, and 2/3rds of what the US "makes" comes from recycling. The more the US can make itself self sufficient from domestic sources, the better. The military especially wants to be able to source as much as possible from domestic sources. Densified wood is very favorable to US interests.

>>12344297
Question... if you could densify it enough is there any reason you couldn't build a spacecraft out of wood?

>>12346184
It appears that the wood's mass remains roughly the same though the volume is decreased. If this is indeed the case, it would mean the wood is still heavy for its strength which would make it unsuitable for things that need to oppose gravity such as aircraft or spacecraft. Maybe someone else can comment on the weight(mass)/strength ratio.

>>12346354
looked up data on yield strengths and densities of materials

Yield Strength (in MPa)
>Pine - ~40
>Oak - ~60
>Structural steel - ~250
>Aluminum - ~300
>Stainless steel - ~500
Density (in kg/m3)
>Pine - ~500
>Oak - ~650
>Structural steel - ~7800
>Aluminum - ~2700
>Stainless steel - ~8200
Y/ρ (in MPa/(kg/m3))
>Pine - ~0.080
>Oak - ~0.092
>Structural steel - 0.032
>Aluminum - ~0.111
>Stainless steel - 0.061

But, in principal if the OP's image is true, an 80% decrease in thickness (5-fold increase in density) produces an almost 12-fold increase in strength.
>Densified Pine - ~0.184
>Densified Oak - ~0.212

This is all based on the first results I managed to get off google, so it's a very VERY rough gauge, but at a glance that's a REALLY good tradeoff which appears to let the strength/weight of densified woods rival that of typical high strength construction materials.

>>12346695
That looks promising. I wonder if the densification process warps the shape or not. Being able to shape the wood before densification when it is more pliable would be useful.

>>12344297
>>12344305
>>12344355
>humidity sets in
>wood expands and building collapses

>>12346930
Looking up some information on the new techniques being used it *sounds* like there's at least some ability to shape it before or during the densification process.

I remember something abou using cellulose like kevlar or nanotubes because of its high strength potential or something,

>>12346354
people jerk off that silk is stronger than steel but by that logic the same is true for wood.

Since this thread is on the subject of wood does anyone know what this is called? Supposedly 1000 year old churches were built using this technique
https://www.youtube.com/watch?v=76nTzxNxGCs

>>12347134
first take a type of wood with a highly rot resistant heartwood like cedar

>>12347134
Carpentry.

>>12347367
>>12347799
I mean the technique where he cuts the holes in the bark to dry out the sap in the wood. What is it called?

>>12344355
They built a few large buildings in Helsinki recently and made a lot of fanfare about it, but I wouldn't call them skyscrapers.

>>12347134
reminds me a little of the submerged logs they harvest from the old mill ponds, they say because they've been underwater for a century all the sugars and other compounds have leached out

>>12347961
It's called "dwying"

>>12346015
>>12346021
>>12345988
I'd be curious to see which actually is more resource and energy efficient.

https://en.wikipedia.org/wiki/Nanocellulose

>>12345386
just one?

>>12349015
>2020
>not combining nanocellulose with mycelium
I seriously hope you guys don't do this

>>12349253
I saw an article with chitin

>>12345918
>I'm going to go out on a limb
Kek

>>12344297
So they are basically trying to develop an industrialized bog-oak process.

>The shortage of oxygen, and the acidic conditions of peat bogs and riverbeds help to preserve tree trunks from decay. The wood then begins to fossilise, making it significantly stronger.

From experience, I can tell you that a bog-oak is bullet resistant, cut resistant and fire resistant. You have to have industrial equipment to actually process these things. I can see an actualy military use for such a material. I know for a fact that a bog-oak will absolutely deflect all 7.62 rounds and .223.

>>12350517
so will thin steel plate, and cover a larger area, and easier to roll big sheets.

forges can roll out, extrude steel at any size and profile.
20year old or so farmed timber is not a significant diameter, then shrunken.
that leaves a limited profile and size of material, which limits the uses.

if you cant commercially (less than 20 years) get 1m x 40m trunk, like you get steel girders, you cant build sky scrapers

>>12351443
I think biomass deposition is something up to 20T per hectare per year on average probably 18T and below

>>12351464
*that's tonnes of dry matter not fresh

how is it made?

>>12351658

A 500lb person sits on a plank of wood

>>12351698
Do Americans REALLY??

>>12351698
so every wooden american chair is densified?

>>12351751
How else do you think they discovered it?

>>12351874
trying to cut up trees that had snapped and twisted crreating high pressure points that would have been harder to cut or maybe just the age old patter of hitting would and leaving dents

>>12345347
Because it's maintenid witha fuckton ofm oney on top of the fact that for modern buildings they can last that long but there's absolutely no point to because in the future the sheer cost of maintenance, renovating and updating would make it prohibitively expensive.

>>12346695
are we getting wood tanks now

>>12352309
holy shit let me rephrase that. Most of the churches like this are gone barring the ones in Norway. The most well known ones have lot of maintenance and resources put into them to keep them preserved for historical purposes. For modenr buildings they can be built ot last forever but there's no point to because sooner or later you'd need to basically build a new house because the current building is too outdated or a bitch to maintain and renovate (like the PM's house in Canada).

>>12346695
please calculate densified bulsa wood, i love you thanks

>>12344351
maybe something to do with radar reflection

>>12344351
very dense tree

>>12345368
I kekd, fuck these other Cyril Faggots

>>12344351
It is my understanding that the higher-ups desire an absolutely bitchin' treehouse

>>12345347
IS THAT A..
CHURCH????
AAAAAAAAAAAAAAAAAHHHHHHH SAVE ME EURONYMOUS I'M GOING INSANE

>>12344351
im sure there's a way to make it kill brown people in countries you've never heard of

>>12353765
You may have been making a joke but balsa is one of the types of wood that the researchers used. They even called it out specifically as being ideal because it is fast growing, which means they could have lots of production capacity.

>>12344487
>>12344501
I'd think that if you further treated it with an epoxy coating of some sort to completely seal it, it wouldn't rot for quite a long time.

>>12345901
My goodness someone has a bad case of Potty Mouth! Anyone got a bar of soap for Mister PottyMouth over here?

>>12344501
Presure treated still rots