Steel has modulus value equal to 210 GPa at room temperature. When tensile test is conducted (without using extensometer) on the round specimen with gauge length equal to 16 mm. The engg. stress-strain curve slope shows less value (approx 70 GPa) of elastic modulus. Why? Can we report these results on scientific papers. (where extensometer was not used during test, instead of this percentagel elongation was calculated based on marking on gauge length?
How accurate was the marking on the gague length? how did you measure that? When did you measure that?
There might me some inaccuracy in extracting experimental results.
Can you share your Stress vs Strain curve obtained from experimental analysis ?
The result may be due to the method of test or calculation, or the alloy of the metal tested is not in accordance with the standard specifications.
The tensile apparatus and your specimen have similar elastic modulus.
The elastic elongation of the apparatus, together with small gaps which closing at the beginning of the experiments increase the recorded displacement, so the elastic modulus seems much lower.
This is why you don't get this effect when using DIC or extensumeter
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