We use Vickers indentation method for estimation of the fracture toughness. We use the following formula, Fig. 1. The calculation requires the average length of cracks. If there is only one 8 μm crack (Fig. 2), then we take the average 8 μm? Or (8+0+0+0)/4 = 2 μm?
Dear Andrey Leonov ,
I think the load of indentation, you have used, was not high enough to induce the radial cracks at all corners of indenter's impression. I recommend you to increase the load and repeat the test for 3 or 4 times. In my opinion, you can not rely on only one indentation as well as on the length of only one crack instead of four cracks.
Dear Andrey Leonov ,
I think the load of indentation, you have used, was not high enough to induce the radial cracks at all corners of indenter's impression. I recommend you to increase the load and repeat the test for 3 or 4 times. In my opinion, you can not rely on only one indentation as well as on the length of only one crack instead of four cracks.
I also think that the charge must be higher for more accurate reproducibility of cracking.
First of all，the Vicker's indetation method has raised some criticism in terms of measuring fracture toughness. Despite of its simplicity, you should take extra care to excute such experiments. In this case, I would suggest you to increase the applied load.
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