Attacks done with a max damage, no +damage mod axe at 12 axe mastery.
With Sundering = 10% Sundering = 10 Strength = 10% Sundering
Without Sundering = 0 Strength
60 armor;
48 - critical hit without sundering
53 - critical hit with sundering
damage increase - ~10%
80 armor;
34 - critical hit without sundering
39 - critical hit with sundering
damage increase - ~15%
100 armor;
24 - critical hit without sundering
28 - critical hit with sundering
damage increase - ~17%
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Tests done on a 100 armor target
#1
in ten hits, the damage done was as follows
16, 15, 7, 15, 7, 6, 8, 9, 9, 24
total damage - 116
low - 6
high - 24 (critical)
average - 11.6
now if a Sundering (+10% chance 10%) Axe was used instead of a non-sundering:
say the sundering was on the low.
6*.17=1.02
so it would have hit for ~7 damage instead of 6, increasing the average by .1 (damge of 116 raised to 117, average of 11.6 raised to 11.7)
say the sundering was on the high.
24*.17=4.08
so it would have hit for ~28 damage instead of 24, increasing the average by .4 (116 to 120, 11.6 to 12)
say there were two sundering hits, one on the high and one on the low.
+5.1 damage (4.08+1.02), increasing the average by .5 (116 to 121, 11.6 to 12.1)
more trials to come, more trials on different armors to come
enjoy!