In order to get the 0.2% yield or proof stress, in the load vs extension curve take a point on x-axis at 0.2% of gauge length ( if 50 is GL then this point is 0.1mm on the x-axis ie along the extension). From this point draw a parallel line to the curve obtained by tensile test. This line would meet the curve at a point. Load corresponding to this is the 0.2% proof load and the stress based on this will give 0.2% Proof stress. Since some alloy steel unlike mild steel does not have a specific point of yield, this method is suggested for estimating the yield strength allowing a permanent yield of 0.2%. Software will have this but you have to verify that 0.2% of GL marked is taken for getting the value.
With warm regards
Mohan Ananthanarayanan
DGM QC VSSC
On Fri, 30 Oct 2015 20:28:50 +0400, Harish Kannepalli wrote
> Did u use extensometer or not?
> You have to construct 0.2% offset on the strain axis and get the 0.2% yield strength. Probably ur software would have that option!
>
> 2015-10-29 19:13 GMT+04:00 Padmasanker S <padmasanker87@gmail.com>:
>
> Dear all,
> Please refer to attached stress -strain graph obtained during tensile testing of SA 106 Gr B pipe.
> While performing tensile testing of SA 106 pipes for Div 1 vessels ,we were not getting yield point even though required tensile strength is obtained.
> The specimen were taken in both transverse and longitudinal direction from half thickness.
> Kindly share your experience in finding the root cause..
> Please inform if any further details is required for clarity.
>
> Best regards,
> Padmasanker,
> Quality coordinator,
> Bilfal heavy industries ltd.
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