An unnotched solid beam with a square cross-section is made of SAE 4142 steel (450 HB)...

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An unnotched solid beam with a square cross-section is made of SAE 4142 steel (450 HB) - See Table 9.1 (Appendix). The beam is loaded in cyclic bending between Mmin = 0 and Mmax = (20) kN. m. The expected service life is 130,000 cycles. Determine length a of the cross-section if the safety factor on life is equal to 18. Assume that Goodman's rule applies to this problem. a An unnotched solid beam with a square cross-section is made of SAE 4142 steel (450 HB) - See Table 9.1 (Appendix). The beam is loaded in cyclic bending between Mmin = 0 and Mmax = (20) kN. m. The expected service life is 130,000 cycles. Determine length a of the cross-section if the safety factor on life is equal to 18. Assume that Goodman's rule applies to this problem. a