8. The S-N curve of a material is described by: log N = 20(1 -) max A component made from this material is subjected to 1010 cycles at ơa = 0.40max- Next, it subjected to 1012 cycles at oa = 0.30max If the cyclic load is increased to 0.80max (a) How many more cycles will the material withstand? (b) Point out the limitations of Palmgren-Miner rule.

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