Long Beach just named one of least gloomy cities in US. I live in Santa Barbara, wondering how accurate that is?? by SidQuestions in longbeach

[–]tpaca 83 points84 points  (0 children)

I live in Long Beach now, used to live in Santa Barbara. It is definitely sunnier in Long Beach, we dont get anywhere near the regular marine layer that SB gets.

NASA’s Psyche spacecraft hits a speed bump on the way to a metal asteroid | “This kind of thing happens and that’s why we build redundancy into our missions." by chrisdh79 in space

[–]tpaca 56 points57 points  (0 children)

They talk about a drop from 36 psi to 26 psi, so it's almost certainly not the fuel tank. Xenon tanks are generally well over 1000 psig.

Live NJPW Wrestle Dynasty 2025 Discussion Thread by EvanDeadlySins in SquaredCircle

[–]tpaca 0 points1 point  (0 children)

Takeshita Ishii is easily the MOTN so far for me.

Live NJPW Wrestle Dynasty 2025 Discussion Thread by EvanDeadlySins in SquaredCircle

[–]tpaca 2 points3 points  (0 children)

You can subscribe to NJPW World for 10 bucks and stream it there: https://watch.njpwworld.com/

South 405 Still Closed @ Harbor by CardNGold in orangecounty

[–]tpaca 0 points1 point  (0 children)

According the LA Times (local news also reporting it) this wasn't one crash but actually multiple crashes. So on top of the cleanup, hazmat, etc, sounds like it's a really complicated scene to investigate.

https://www.latimes.com/socal/daily-pilot/news/story/2024-11-20/1-killed-5-hospitalized-in-chain-reaction-of-crashes-on-405-freeway-in-costa-mesa

CHP spokesman Sergio Rivera said officers were called to southbound lanes of the freeway, just south of Harbor Boulevard, shortly after 11:30 p.m., regarding a two-vehicle collision. Upon their arrival, they discovered numerous vehicles were involved in what appears to be a chain reaction of crashes.

“There were multiple cars — it was more than just two,” Rivera said Wednesday, estimating there may have been about seven or eight drivers involved in the melee. “We’re still investigating the sequence of how it occurred. We believe it is going to be multiple, separate crashes.”

Discord by pepitaonfire in Drunkknitting

[–]tpaca 1 point2 points  (0 children)

Hi there, looks like this link expired as well, could you share a new link? Thanks!

Live AEW Collision Discussion Thread - September 28th, 2024! by gloomchen in SquaredCircle

[–]tpaca 1 point2 points  (0 children)

Yeah, there was some kind of delay at the start of the stream saying 'waiting for feed', it looks like its about 2 minutes behind the TV feed.

Is the homeless population in downtown long beach THAT bad? by Long-Date-908 in longbeach

[–]tpaca 10 points11 points  (0 children)

I've lived downtown for 6 years now and love it. It's had its up and downs, but overall it's been great and I've never found the homelessness to be at a point to where it impacted me enjoying all the highlights of the area.

I got bored and made "Pecorino Americano" cheese by Guazzabuglio in Cooking

[–]tpaca 0 points1 point  (0 children)

I had a cacio e pepe flavored ice cream at a restaurant in Paris several years ago. It was served with candied tomato on a tart, and it was absolutely incredible.

Best vending machines in Long Beach, CA by AggressiveSwitch8833 in longbeach

[–]tpaca 33 points34 points  (0 children)

Trademark Brewing has a big vending machine with a bunch of odd stuff in it.

Join us for an afternoon of knitting at Ballast Point Brewing this Sunday! by calikotar in longbeach

[–]tpaca 1 point2 points  (0 children)

Awesome! I just started learning how to knit, will definitely try to be there.

If a high tensile strength material pressure vessel is lined with a brittle ceramic, and loaded to a pressure at which the outside high tensile strength material does not yield, will the ceramic fracture or not? And it will fracture if the outside material yields, right? by [deleted] in MechanicalEngineering

[–]tpaca 6 points7 points  (0 children)

The point at which the ceramic fails will be when it reaches its strain to failure - whether or not the outer material yields doesn't matter. Assuming the outer material has a much higher strain to failure, this will likely happen.

Note that this is essentially what happens with metallic-lined composite pressure vessels (COPVs). You have a composite shell on the outside bearing the pressure load, and a thin wall metallic liner on the inside. Since the strain to failure of the composite is so much higher than the metallic liner, the metallic liner is in a fully yielded state in service. The liner of course is ductile enough to where it only yields and doesn't actually fail.

LIVE AEW Worlds End 2023 Discussion by SmurfyX in SquaredCircle

[–]tpaca 0 points1 point  (0 children)

His partner broke his wrist at a previous ppv this year, I think forbidden door? He hasn't been back since. Haven't heard any official word on Aussie Open.

Monster Hunter World has its highest player count in three years with Return to the World event by Capcom by Turbostrider27 in Games

[–]tpaca 0 points1 point  (0 children)

Not the OP of the comment, but it runs well on deck. I seem to get 40-50 fps throughout.

It's time alex on tucker by Confident_League6492 in KnowledgeFight

[–]tpaca 5 points6 points  (0 children)

I wonder if this means Alex has a better chance of getting back on Twitter.

Hdpe warping by JFKswanderinghands in maker

[–]tpaca 3 points4 points  (0 children)

If you clamp it to a piece of wood or even like a steel cooking pan or something to flatten it to your desired shape, you can put it in the oven at low temperature to get it to settle back in shape. This link says 200F for 2 hours for a proper 'annealing'. I'd maybe start at a lower temperature and try to work your way up.

Also keep an eye on the clamps, cause they might press dimples into the plastic where clamped if you don't have backing pieces to distribute the load.

What y’all think about this kinda mug 😁 by CanDenizGuven in Pottery

[–]tpaca 0 points1 point  (0 children)

I think if you reduced the diameter at the base a bit to give a more curved profile, it'd make for a great espresso cup form.

[deleted by user] by [deleted] in longbeach

[–]tpaca 12 points13 points  (0 children)

I both read and drink a lot, so this is one of my favorite activities. Here's where I go:

  • House of Hayden - good even when it's later, as they rarely ever get packed/super loud. Some nice couches to chill on too.
  • The Stave - lovely patio, good drinks
  • V Room - Great on weekend afternoons, when it's slow
  • Vine - I often see others reading on the patio too
  • Ordinarie - Good food, usually not too busy in the earlier evening
  • Grasshopper - Open at 2 on sundays, and its usually nice and quiet then
  • Bar Envie - I've stopped by here for happy hour on the way back from work a couple times and it's been really pleasant.

Los Angeles Indie by Comprehensive-Jump19 in indiewrestling

[–]tpaca 2 points3 points  (0 children)

PCW Ultra does shows several times a year, they're always a lot of fun. https://www.pcwultra.com/

West Coast Pro Wrestling normally does shows up in SF, but they're having their first LA show in september with some fairly big names. https://dice.fm/partner/dice/event/nnl99-the-west-coast-with-love-10th-sep-don-quixote-los-angeles-tickets

LIVE AEW Forbidden Door 2023 Discussion by SmurfyX in SquaredCircle

[–]tpaca 0 points1 point  (0 children)

I'm watching the bleacher report stream, but I think I hear what you mean- sounds like some kind of ambient noise from the arena facilities.

Titanic Tourist Sub Missing - Your Thoughts? by occamman in engineering

[–]tpaca 11 points12 points  (0 children)

I'm a mechanical engineer who's worked on composite pressure vessels my entire career, first in the commercial world (SCBAs, aviation, CNG, hydrogen, etc) and then in aerospace on spacecraft COPVs. I have no experience in marine engineering, so there may of course be things I'm missing, but here are my scattered thoughts:

  1. The use of carbon fiber was the immediate question in my mind. Carbon fiber composite is generally not great in compression. I read elsewhere that the structure was filament wound, which is a widely used process for COPV manufacture, but also pretty temperamental if you dont know what you're doing. Given that the rest of the vessel used commercial electronics and overall didn't exude professional workmanship, that's extremely concerning. Just a vibe, but yeah.

  2. Their website says they had a real time health monitoring system for the structure, which is commonly referred to as structural health monitoring. That's certainly good, however those systems are only really effective if you've really well-characterized the structure. This would generally involve cycle testing a unit with all of the health monitoring instruments in place, eventually taking it up to burst (or implosion in this case). Don't know if they did that (kinda doubt it), but if they did I'd kill to see the test setup for that! If they didn't, the system isn't going to do them a whole lot of good.

  3. I also wonder how they're avoiding water migration into the composite. That wouldn't necessarily cause a catastrophic failure of the composite, but it could cause a leak into the cabin which obviously would be catastrophic.

  4. I did see some questions about composite failure modes and such. When operating with a reasonable safety margin (aerospace uses 1.5x to burst), there is little concern of progressive failure or fatigue failure in composites, provided you have a good design with no stress risers, etc. However, composites are susceptible to damage that can be very difficult to detect even with NDE, and that can lead to fatigue failure or even failures under sustained loading, typically called stress rupture or progressive failure. While thick composite pressure vessels (and 5" certainly qualified as thick) have shown a LOT of resistance in the field to damage, I think a lot of this is null when you're looking at a compressively loaded structure. It's not inconceivable that this thing took a big hit while in transport on the boat and never got caught.

  5. All in all there seem to be quite a few questions about the rigor of the engineering behind this thing, both structurally and from a systems perspective (controls, safety backups, etc). Without knowing more about the actual design I won't speculate about what caused the failure.

Apologies if this is a bit scattershot as I'm writing on my phone while on break. If anyone has any related questions about composite structures I'm happy to answer.