J-20 5th Gen Fighter Thread IV (Closed to posting)

[delft]

1. 3D printing seems to limit the sizes of crystals to the size of the granules used in the print.

2. It would seem to be a serious challenge to shape or orient the crystals to maximize strength in the printed product

3. Making the granules adhere would seem to require serious heating that would further effect control over existent crystals in the granules.

4. It would seem to be challenging to control the void spaces between granules.

1. The higher yield strength is often associated with smaller crystalites. Influenced by the alloying elements.
2. If you want more strength in a specific direction you add fibers.
3. Serious heating is very locally provided by lasers. The powder is liquified.
4. How would voids remain after liquifying the metal. Think of the surface tension.

Btw a comparison with a semiconductor fab is quite beside the bridge.

 

[Verum]

3D printing using metal is actually pretty good in terms of strength, especially using EBM or "electron beam melting", according to a credible source quoted by wiki, it is "fully dense, void-free, and very strong".

The melted material is from a pure alloy in powder form of the final material to be fabricated (no filler). For that reason the electron beam technology doesn't require additional thermal treatment to obtain the full mechanical properties of the parts. That aspect allows classification of EBM with selective laser melting (SLM) where competing technologies like SLS and DMLS require thermal treatment after fabrication. Compared to SLM and DMLS, EBM has a generally superior build rate because of its higher energy density and scanning method

Right now 3D printing is in its infancy. But even if the internal structure of the crystals are not as strong as the forged parts, say only 70-80%. The structural improvements enabled by the flexibility of 3D printing, otherwise impossible from forging, could improve the strength of the part, producing equal if not better structural integrity than before, and shed weight at the same time.

 

[Deino]

Sorry guys ... can we PLEASE continue this material science and manufacturing techiques in another tread ??

I'm - and I'm sure a few other too - are eagerly awaiting the 2011's maiden flight and my old heart each time gets a small heart-attack when I notice a new post in this tread ... and even more one again when I see it's not a first-flight image !

Therefore, PLEASE !!!

Deino

 

[Jeff Head]

Deino!

Today !!!!!!!!

​

Not...gotcha.

Hehehe.

 

[Deino]

For a moment You got me !!!

But regarding the tail (not cropped) and the pitot I was sure after a second moment that this is an old one of '2001'

By the way; no news, not even a small romour or eye-witness-report, no VIP-flights to CAC ??? NOTHING

Deino

 

[Air Force Brat]

Deino!

Today !!!!!!!!

​

Not...gotcha.

Hehehe.

Now Jeff, that was MEAN Dude, but Deino did leave you an opening, first thing I looked for was the cropped tail, and Deino, haven't you heard of Chinese water torture?????? Drip,,,,,,,,,,Drip,,,,,,,,,,,,,,Drip,,,,,,,,,,,,,SO, since they like to make a liar out of me, whoever they are, I will predict NO first flight, we don't even know of a run-up or taxi-test till after the New Year, we have been waiting for well over a year for this, and though I am patient, I too am getting a little disgusted, but watch out for Deino, he may put you in time-out Jeff, oh that was mean, so one of you guys should "catalogue" the known changes on 2011, I really don't anticipate a lot of changes to the FCS due to the intakes and clips, but who knows??

Hows that for a run-on sentence????

 

[Deino]

YES, that's torture ... worst torture !!! ... and YES, I have to admit, I'm probably the most impatient man.

Anyway I was indeed thinking about sending him into "vacation" for this joke - to think about his sins - until that long-expected flight had happened. But I'm not sure if a Super Moderator could send another Super Moderator into vacation due to tortures !?

Deino

 

[Air Force Brat]

YES, that's torture ... worst torture !!! ... and YES, I have to admit, I'm probably the most impatient man.

Anyway I was indeed thinking about sending him into "vacation" for this joke - to think about his sins - until that long-expected flight had happened. But I'm not sure if a Super Moderator could send another Super Moderator into vacation due to tortures !?

Deino

Well tomorrow is Sunday, so maybe he will repent or do some penitence as well, I', sure he's feeling pretty bad right now, now Jeff, say you're sorry to your brother Deino, and go to your room to "think about it". Lord knows I've had my share of "whuppins", but you have to earn your nick-name somehow, so brat is prolly fitting???

I was predicting 2003s roll out and first flight last year at this time, so if they don't fly that thing, we'll just have to go over and fly it ourselves. So now 2003 has become 2011, and here we are again, so Chengdu, don't be surprised if brat and Deino arrive on your "doorstep" with our coupla cans of gas and our "flying googles", kinda like the Wright bros.....so lets get that bird in the air!!!

 

[Jeff Head]

YES, that's torture ... worst torture !!! ... and YES, I have to admit, I'm probably the most impatient man.

Anyway I was indeed thinking about sending him into "vacation" for this joke - to think about his sins - until that long-expected flight had happened. But I'm not sure if a Super Moderator could send another Super Moderator into vacation due to tortures !?

Deino

Aw...come on my friend. I mean, heck, I bought and love your book! Surely that almost balances the scales?

Besides...I used a pic with a pitot tube, and with the wrong tail feathers and all...and I knew, with your superior knowledge that you would only be fooled for an instant, if even that...and then only because you want it to be a test flight so badly.

But, if it did cause you any angst or consternation in the least, I hereby sincerely apologize.

...at least until I can figure out a way to do a better one next time! LOL!

Seriously though, I do hope they roll this baby down the runway soon and let it takeoff into its natural environment. Another banner day that will be.

And with that...good night all!

 

[Deino]

Yes ... it was a nice joke and that's what I especially like here at SDF ! Thanks Jeff.

And now CAC let this baby fly !!

Deino