what is the stress and strain for nichrome wire?
Modulus is 2.2 × 10^11Pa
Not sure what exactly you need, but you can calc. a lot of what you need.
Nichrome wire is the preferred wire, because it has known electrical properties (resistance per foot, heat to amperage ratio, etc etc). But there is a bit of sag that occurs with nichrome wire, that is really difficult to eliminate at lengths greater than 2-3 feet....
Wrap the wire around the cylinder to form a loop:
Finally, twist the wire around itself and you now have an inoculating loop:
You can stick your inoculating loop in a cork or use a wooden clothespin for a holder.
To make the borax bead you’ll need some borax (sodium tetraborate) and a flame from an alcohol lamp or stove. Put a few grams of borax on a nice clean surface—you can use a blank sheet of computer printer paper, watch glass, or evaporating dish. Heat the inoculating loop in your flame until the loop is red hot. Then dip the loop in the borax. This will coat the loop in borax. Put the loop back into the flame. The borax will swell and then shrink to a white, glassy bead. It may take a few tries, but repeat the process until you have a bead that is at least 3 mm in diameter.Custom EMI Shield Mfr for +68 Years and Worldwide Mfr. of Mu Metal ®.