4. Rainflow counting is used to analyze a periodic loading block. Given in the table are the stresses corresponding to the cycles from the rainflow analysis. Using this data, calculate the number of cycles, N, to failure for each cycle of the table. Calculate the number of repetitions of the loading block that can be made before failure, N. All stresses are ksi. The material is 1045 CD. Include surface condition modifier Cycle Ans N. 1077 ?min -50 -20 -55 -20 -20 ?max 85 40 85 85 4 5751 5751 Ans.: 780 4. Rainflow counting is used to analyze a periodic loading block. Given in the table are the stresses corresponding to the cycles from the rainflow analysis. Using this data, calculate the number of cycles, N, to failure for each cycle of the table. Calculate the number of repetitions of the loading block that can be made before failure, N. All stresses are ksi. The material is 1045 CD. Include surface condition modifier Cycle Ans N. 1077 ?min -50 -20 -55 -20 -20 ?max 85 40 85 85 4 5751 5751 Ans.: 780