steel stress-strain graph

You could check with Mr. Google using the search words "GR60 reinforcement stress/strain curves" which would take you here. If you have Power Point, the second item called "Lecture 3" gives you a good stress/strain curve for several steels including GR60.

Just curious, Why do you want the stress strain curve itself, instead of the mechanical properties minima?

milo

Stress strain curves are used in designing in the elastic-plastic range.

What I don't understand is why he's using rebars, which once it goes beyond the elastic limit (assuming a balance strength design) the concrete would have already cracked.

Thats what i was trying to get to.

Seemed like the wrong question to me for the situation.

milo

You can easily draw it yourself.

If you plot stress on the vertical, strain on horizontal axis it's a straight line through the origin, slope = elastic modulus. Straight line only within the elastic range, but I wouldn't think you'd want to work rebars outside that.

Different grades of steels vary widely in strength, but have same elastic modulus about 200GPa. Rebars might be worse as they tend to be made from recycled Skodas, according to a thread a few months back.

Cheers....Codey

i am a noodle

If you are an uncooked noodle, you would have virtually no elongation or reduction in area, and your yield strength would have a very high standard deviation, and be virtually indiscernable from the Ultimate tensile strength. You would have virtually no impact strength. and would have high hardness (resistance to indentation).

On the other hand, if you are a boiled noodle, your resistance to indentation would have declined, you would have a much higher % elongation and % reduction of area.

Interestingly ASTM A370 para.8.4 would allow boiling in water or heating in oil or oven as a means of aging the specimen prior to testing.

Hear is a prefered test apparatus for such testing:

milo

You're both noodles!