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Making Spherical Tanks Through Explosive Hydroforming

eric3579 says...

From YouTube videos description..

Explosive hydroforming, also known as HERF (High Energy Rate Forming) or exploform, is a striking alternative to the more traditional process of metal hydroforming. Unlike this older method, which shapes metal using pressurized hydraulic fluid pumped into a forming chamber, HERF techniques utilize an explosive charge to create the necessary pressure. Although the charge is relatively small, it is capable of generating enough force to mold the associated metal into the die.

The explosive charge is typically positioned at a specific distance from the workpiece, and both are immersed in fluid, usually hydraulic fluid or simple water. Certain facilities may also use oil, gelatin, liquid salts, or regular air as the transmission medium. However, water is the most commonly used medium as it is the least expensive, excellent for creating uniform peak pressure, and readily available. Once the charge and workpiece are properly positioned, the charge is detonated, pressing the workpiece into a die. The part is then removed and the process is repeated if necessary.

Explosive Hydroforming Methods
Explosive hydroforming techniques fall into two basic categories. Although both methods function according to the same general principles, they rely on very different placement of the explosive charge within the forming chamber.

Standoff Method: With the Standoff Method, the explosive charge is used in conjunction with an intervening medium. In most hydroforming applications, the intervening material is typically water, oil, or air. The required deformation level dictates how far the explosive charge is placed from the piece of metal to be formed. When the charge detonates, the ensuing force is transmitted through the fluid and pressures the metal into the die. Detonations used in the Standoff Method can often reach several thousand pounds per square inch (psi).

Contact Method: In the Contact Method, an explosive charge is placed in direct contact with the forming metal. This process generates far more pressure than the more conventional Standoff Method. By placing the explosive charge in close proximity to the surface material, the detonation can result in as much as several million psi.

How to Control Stress in Real-Time

bobknight33 (Member Profile)

BSR says...

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bobknight33 said:

Just more fake news to keep you leftest stirred up.

Nothing happened worse on Jan 6 than any leftest anarchy event ( portland) last 4 years.

How Marvel Actually Makes Movies Years Before Filming

Khufu says...

It's not the VFX that bore you, it's the design of the shots/action. You would feel the same way if the same busy, over-designed novelty shot was done with traditional special fx techniques. Just making the distinction because people often blame vfx for stuff that is really a design/filmmaker issue.

cloudballoon said:

Super busy VFX bores me to death...

How Fiona Apple's video for Shameika was animated

How bridges were built in Medieval times

oritteropo says...

The language is Czech, and more details about the animation are in BSR's post.

Water wheel powered pumps like the one used to empty the dam have been used for 6000 years, and all of the techniques shown here were used in the ancient world.

SFOGuy said:

*promote

Also: I guessed that the language is Swedish--will happily accept corrections

Biggest World War Two bomb found in Poland explodes

oritteropo says...

The bomb was actually too large for a controlled explosion, with 2,400 kg of explosive, so instead the navy divers used a technique that was supposed to cut open the casing and burn the explosives inside. This was the successful result

Whipping a massive chain

bobknight33 (Member Profile)

newtboy says...

Bob o Bob o Bobby bob....
All 3 of those issues are caused by Republicans....Trump specifically.
Not one is technically voter fraud, although the point is to deny as many citizens their right to vote. If you call that cheating, and I agree it is, it's more Republicans cheating, not Democrats.

Trump and his crony he installed as postmaster have intentionally hobbled the usps, removed sorting machines around the country, and cut overtime to zero among other mail slowdown techniques in preparation for the massive mailings of the election. This is causing a backlog of mail nationwide, and is why so many ballots arrived late in NY....many weren't sent to voters until the day before the election, thousands more simply weren't postmarked at all. Our post office is filling up with undelivered mail NOW because of Trump's scheme to deny votes by deconstructing the mail service....very Trumpian to destroy an essential service for his own personal gain, just like he didn't mind the military wasting tens upon tens of millions per year on foreign fuels and foreign airport fees to stay at his expensive failing hotel in Ireland (Scottland?) instead of American military bases like they did before Trump because it made HIM money.

The post office requested $3 billion for election preparations, Trump refuses to give them a dime, and actually said publicly that he won't so they can't help with mail in voting, because it's bad for Republicans.

Now, wanna try again?
You said you know cases of Democrats committing vote fraud...cheating. This ain't one. These are three articles about how Trump is already cheating this election by denying most Americans a safe way to vote, and since polling places will be largely closed or under staffed, that means the entire election is defunct by Trump's design.
I get why you refused to answer if it's all you could produce after two months, one Republican ploy to deny millions of Americans their right to vote. Jesus Fucking Christ.
🤦‍♂️

bobknight33 said:

For someone who has the answer on all matter you are suddenly dumbfounded in finding such issues.
Gather that fake news does not mention such things. brian stelter and Rachel Maddow are doing you wrong.

https://abcnews.go.com/Politics/ballots-pile-mail-potential-nightmare-looms-election-night/story?id=71719232

https://www.washingtonpost.com/politics/scattered-problems-with-mail-in-ballots-this-year-signal-potential-november-challenges-for-postal-service/2020
/07/15/0dfb8b42-c216-11ea-b178-bb7b05b94af1_story.html

https://nypost.com/2020/08/05/84000-mail-in-ballots-disqualified-in-nyc-primary-election/

That's some dope ass bass playing (super funky)

wtfcaniuse says...

Very cool. I was impressed with tweaking the dial between slaps. Playing slap on a RH bass left handed would be extra difficult because there will always be a delay when moving the wrist to pluck above the slap.

Would be cool to see slo-mo footage of his technique.

How Ancient Palestinian Soap Is Made

WmGn says...

nice, but also somewhat painful to see them using manual labour: how much better could they do, using more modern techniques to make the same soap?

Lamplocked

BSR says...

THE GRAPE VINE
A restraint technique used by special forces in WWII.

“After a while in this position, 10 to 15 minutes, you start getting cramps in your legs, which becomes unbearable. The natural reaction is to let go of your hands to relieve the pain, which forces you to fall backwards. This unnatural position places pressure on your rib-cage, and your breathing is restricted. Eventually, you pass out, and your lungs may collapse if you are not pulled out…

Caution. - To release your prisoner: Two persons are necessary, one on either side. Take hold of his legs and lift him up the tree; then unlock his legs.”

https://criminalwisdom.tumblr.com/post/324640171/the-grape-vine-a-restraint-technique-used-by

Key & Peele - Rap Album Confessions

Demonstrating Quantum Supremacy

moonsammy says...

Have you by chance read Ender's Game? It's been a while for me, but I believe those books used this technique for interstellar communication, think it was called the Ansible.

newtboy said:

Wow. Awesome.
*doublepromote *quality science.....a potentially exponential computing advancement, great until it becomes sentient and murderous.

Next, can they tackle Entangled Quantum Particle computing and communication. If we go to Mars, it would be great to have instantaneous communication instead of a varying delay each way.

Jim Says Christian Leaders Will Be Murdered If Trump Loses

BSR says...

Religion needs love.
Love doesn't need religion.

God needs love.
Love doesn't need God.

----------------------

Create.

cre·ate
/krēˈāt/

verb

bring (something) into existence.
"he created a thirty-acre lake"

synonyms: generate, produce, design, make, fabricate, fashion, manufacture, build, construct, erect, do, turn out;

----------------------
Job Description of an Artist. Fine artists use different techniques to create art, such as weaving, painting, glass blowing, or sculpting. They strive to develop new methods or ideas for making art. ... Only the most successful fine artist is able to support themselves from their art work.

"The bleeding hearts and artists
Make their stand" -Pink Floyd

cloudballoon said:

American church leaders dying left & right? yeah... I'd chalk them up as God smiting them for being false prophets.

I'm a Christian (Canadian), but I see American Christianity as a beast of its own. Nuts cases everywhere that rather get in bed with the NRA and the military complex than practice anything Christ says. Total madness.



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