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Cake day: April 16th, 2026

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  • Plastic and elastic deformation are both terms used to refer to the behavior of a material under stress (such as compression, tension, or torsion).

    For an ELI5 since I don’t feel like cracking open a material science textbook or really getting more nuanced than this for a basic explanation, elastic deformation is generally reversible without permanent changes to the structure of the material, while plastic deformation imparts a permanent change.

    All materials have elastic and plastic deformation modes that can be identified based on their characteristic stress-strain curve. Generally, the linear portion of the curve at lower stresses is the elastic region, and the plastic region begins where the curve becomes nonlinear.

    For example, a wooden beam in a house will bend under normal load. As people move out of the room that beam is in, it will straighten back out- that is elastic deformation. Put too many people or some very heavy furniture in the room, though, and the beam will become permanently bent or even break altogether- that is a plastic deformation.

    Some solid books on this topic are Shigley’s Mechanical Engineering Design and Roark’s Formulas for Stress and Strain

    The colloquial use of elastic and plastic to describe certain groups of materials is based off the behaviors of these modes of deformation. E.g. elastics are stretchy and return to their original shape. If you really want to get into semantics, there are only four types of materials: metals, polymers, ceramics, and composites. Everything else is one of those 4 things.






  • You’re not missing much, it’s a pretty pathetic paragraph suggesting that we should lick billionaire boots because Amazon delivery is fast.

    Here’s what I got with some element zapping in ublock:

    Billionaires Rock

    Kyle Smith

    We ought to build statues of them, not chase them from state to state.

    Free Expression is a daily newsletter on American life, politics and culture from the Opinion pages of The Wall Street Journal. Sign up and start reading Free Expression today.

    Before Amazon came along, ordering anything by mail ordinarily meant waiting six to eight weeks for delivery. Today, for a trivial fee, not only will Amazon bring virtually anything to you with astonishing alacrity, but the final cost of the goods is comparable to, sometimes even less than, the best price you can find at a retailer near your home. During the pandemic, when we were all afraid of crowds, it kept us all going with anything we needed. Thanks, Jeff Bezos.

    Copyright ©2026 Dow Jones & Company, Inc. All Rights Reserved.









  • Machine screws / bolts with a # sign are sized by gauge, not the major diameter of the screw. The gauge system for screws is weird and dumb, but we still use it for small stuff.

    Per fastener direct, gauge can be converted to diameter using the following formula:

    Diameter (inches) = 0.060 + (Gauge number × 0.013)
    

    A #6 machine screw has a 9/64" or 0.138" (approx 3.6mm for our metric friends) major diameter and is offered in standard pitches of 32, 40, 48, and 80 threads per inch (At least, that’s what McMaster Carr stocks. The 80tpi is likely for a specialty application.).

    I’m fairly certain that the unified screw spec stops around 3 or 4" , so 6" is well into custom/non-standard sizing.


  • finalarbiter@piefed.socialtoLemmy Shitpost@lemmy.worldCar lights
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    19 days ago

    Did the Leaf come from the factory with a 50mi range? That’s whack, I remember seeing an eGolf with like 75mi while I was car shopping last year and couldn’t believe that would work for anyone who drives any appreciable amount of time or distance.

    The car I ended up with (2021 Polestar 2) has a nominal ~230mi range and that still feels pretty low compared to newer vehicles with 300+mi ranges.



  • 8gb of ram shouldn’t necessarily be an issue in and of itself, although it’s on the low end these days. The memory is also old enough that it may just be failing.

    Some searching suggests you could use something like Memtest86 to run diagnostics on the memory.

    If it isn’t a hardware issue, you might have luck trying a Linux distro on it. Linux generally runs better on older machines than windows, and some distros are specifically designed to be lightweight and consume as few resources as possible.