Dear all,
I am using a universal testing machine for fracture toughness of epoxy resins via single-edge notched bending test. The maximum load displayed on instrument is in N (newton). According to ASTM D5045-14, for calculation of KIC (fracture toughness) the maximum load should be in kN. I get a value of 186 N for epoxy resin. After conversion to kN it becomes 0.186 kN. The formula for fracture toughness according to D5045-14 is
KIC = (PQ/BW^1/2) * f(x)
where PQ is maximum load
B is thickness of the sample in cm
W is with of the sample in cm
f(x) is dimension less
Now my question is, how can i convert it to Mpa. m^1/2 because it is the standard unit for fracture toughness. Kindly, help.
It is the unit conversion.
Kic = [Pic/B(W)1/2] * f(x)
since f(x) is dimensionless, so I just ignore it during the unit conversion.
The unit for Pic is N; B is m; W1/2 is m1/2
So, the unit becomes N/m(m)1/2 and become N/m3/2
N/m3/2 = N/[m2/m1/2] = N (m1/2/m2) = Pa * m1/2 since (N/m2) = Pa.
Hope this information is helpful for you.
You can get Kic in desired dimension if you insert value of PQ in N .
Also agree with recommandations.
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