The bar shown below is subjected to a repeated tension The b

The bar shown below is subjected to a repeated tension. The bar is AISI 4430 steel with S_ut = 1230 MPa, S_y = 860 MPa, and K_IC = 99 MPa Squareroot m Material tests on various specimens of this material with identical heat treatment indicate worst-case constants of C = 1.36(10^-10) (m/cycle)/(MPa Squareroot m)^m and m = 3.0. A defect/crack/nick of size 0.20 mm has been found on the tensile of the bar. The stress range on bottom at the defect is Delta sigma = 750 MPa. Also, the effective stress intensity modification factor was determined to be 1.2 Estimate the number of cycles of life remaining. 237 cycles 9 cycles 7 cycles 198 cycles

Solution

The answer of following question is as follows.

The number of cycle of life remaining is woo cycles .