• 0 Posts
  • 53 Comments
Joined 1 year ago
cake
Cake day: June 17th, 2023

help-circle




  • There is only once context of actual use where this is true: jousting. And this is because it was a sport that the competitors expected to walk away from.

    Apart from that, what you said is a complete myth. Mobility what highly important on the battlefield, and armorers had to keep that in mind throughout the middle ages. There are many instances where troops acquire or are given pieces of armor that they later discard because it was too heavy or hindered them, and the weight you’re imagining is not all that great. And this is not a problem unique to the middle ages - it still happens up to the modern day

    As for full plate, it’s not actually as heavy as you think it is because there are a lot of shaping techniques used to gain the maximum amount of strength for the least amount of weight. Generally Late Medieval full plate harness weighed 35-55lb Source

    There are medieval reenactment groups such as the Society of Creative Anachronism (SCA) or Historical Medieval Battle (HMB) where people will regularly wear armor and fight. I myself do this, and my kit fluctuates between 40-55lb depending on what I’m fighting with that day. Adding that to my body weight results in a total of about 200lb, and dare you to claim that people at that weight can’t move around.

    What’s even funnier is that groups like HMB tend to have armor that’s significantly heavier than the medieval period because they need their armor to last a lot longer. In period, men at arms only needed their armor to last a few battles, while reenactors look to use their armor on a weekly-to-monthly basis for years











  • mnemonicmonkeys@sh.itjust.workstoScience Memes@mander.xyzAluminum
    link
    fedilink
    English
    arrow-up
    2
    ·
    edit-2
    1 month ago

    Head’s up, referring to it as a “limit” like your article did is incorrect. In engineering you have what’s called an S-N diagram, which plots out the average time to failure based on average cyclic stress. Basically, a lower avaerage stress results in a higher average life. Also, this plot uses a logarithmic scale for both axis, because then all of the plots are straight lines.

    For steel, the S-N diagram has what’s called the “knee”, which is where you have two distinct lines in the S-N curve: one horizontal and one at an angle, with the two intersecting at 1 million cycles. Referring to the knee as a limit (like in the article) is wrong because it’s not a limit; it’s the threshold where if you design a part to last beyond that (aka less cyclic stress than would get 1 million cycles) then it practically lasts forever.

    In reality, the part won’t actually last forever, since the S-N curve beyond 1 million cycles isn’t perfectly horizontal. It’s just that reducing your cyclic stress quickly increases your predicted life into billions or even trillions of cycles. This is known as ultra-high cycle fatigue, and it’s generally impractical to do all the testing required to model because each sample would take months to test on the low end. Plus, there’s little demand for such models in the industry, though there are a handful of PhD students and post-docs working on it