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  • Users: hamsuplo
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  1. hamsuplo

    Material properties of steel for spring

    I have tested heating of springs at different temperatures and duration (i only know my steel is steel grade 70) I have noticed as temperature/duration goes up, the steel color turns from silver -> yellow/brass -> reddish/brown -> purple ->blue -> light blue I would like to know, for my...
  2. hamsuplo

    Hardness testing of spring material

    What are ways to test the hardness or the quality of manufacturing/heat treatment of the spring? The problem with a normal hardness testing machine (eg a rockwell hardness testing) is that these are usually used for flat surfaces and will be difficult to make accurate on a round surface such...
  3. hamsuplo

    Wind vs Mesh/Netting force

    I have a Mesh with a 5mm hole, which during high winds/typhoons can have the effect of a sail. With the area of the net and size of the holes (maybe i can also figure out mesh thickness), speed of wind, how can I find the interaction between the net and wind? What is the approximate force of...
  4. hamsuplo

    Spring stretching

    Hi, below are a few pictures of 4 damaged springs, let's say the spring on the left is 1 to the spring on the right is 4. Spring 2 stretches evenly so I believe it's manufacturing quality is good but has been overloaded. However spring 3 and 4 have irregular stretch in the middle so I think the...
  5. hamsuplo

    Additives and materials for swimming pool noodle

    Swimming pool noodles don't absorb water and are resistant to chemicals in the pool. I have a protective foam tube supplier, whose products deteriorates within weeks in exposure to UV light, but I have swimming pool noodles that seem to last forever. Since they are both foam I would like to...
  6. hamsuplo

    Spring Creep?

    I have an extension spring that is used (theoretically well below its yielding point) and used at room temperature. It is under constant loading (yield load is around 65kg~, constant load is no more than 10-20kg) and within one day it stretched out and didn't return to its original shape...
  7. hamsuplo

    Spring failure reasons

    I have some returned springs that look like picture 3 and 4. There are many ways that the spring user could have misused it so that it turns into picture 3 or 4. But I have to assume that the spring user used it as meant to be used and that the failure is 100% due to the procedures before it...

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