Meaning of symbols in tensile test?

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Ahmad Zafari

Hi Xinfu,

What materials are you talking about here? Sometimes subscript "m" stands for "material", sometimes "maximum", or even "matrix" in case of composite materials. R can be resistance. I personally do not think these symbols are commonly used. Normally Ys, UTS, σY, σf are used to show stresses.

Cheers,

Ahmad

Xinfu Gu

Dear Ahmad :

These symbols are used in the international standard of tensile test. In China, our standard of tensile test has been modified to be consistent with the international standard. I just wonder why use the letter R, Z etc. in the standards. Thank you.

Best regards,

Xinfu

I do not know about Z, but I'm pretty sure that R stands for resistance and "m" maximum. A very misleading symbol though. First thing crossed my mind when I saw R, was the stress ratio in fatigue.