Question

with the ne ed to determine the malllum I You are an engineer at company XYZ, and you are dealing you can apply to a set of bolted/clamped plates, such that you get infinite life. a) (1.5 pt) If you have an coarse thread M12 x 1.75 bolt of SAE Class 5.8, what would you recommend as the initial tightening force in the bolt? Is this initial foree in the bolt the same as the elamped members?Hint: Use F0.9A Sp (2 pt) If the clamped members have an cffective stiffness twice that of the bolt and an external separating load varies between 0 and 5 kN, what are the alternating and mean forces on the bolt? What are the mean and alternating stresses in the bulk of the bolt? (1.5 pt) If the fatigue stress concentration factor is K-2.2 for the threads and we account for a yield strength of 400 MPa, what are the effective alternating fatigue stress and the effective mean fatigue stress in the threads? c) (2 pt) Please draw a constant fatigue-life diagram, including the yield line and infinite Goodman line with a calculated endurance limit. Please assume the endurance limit in this case is d) equal to the endurance limit associated with the R. R. Moore test. Please also label the axes. c) (3 pt) With the altenating stresses associated with the intersection of the yield line and the infinite life line, along with alternating stress calculated in part (c), would we expect infinite life? If so, what is the safety factor with respect to having infinite fatigue life? TAME 10.2 Basie Dimensions of ISO Metric Seres Threads Coarse Threads Fine Threads Stress Area Diameter d (mm) P (m) d, (mm) A, (mm Minor Diameter Stress Area Nominal linor Diameter Pitch Pitch p(mm) d, (mm) A, (mm2) 05 0.6 07 2.39 2.76 3.14 5.03 6.78 878 3.5

Answer 1

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