-The SAE Fatigue Design Handbo

-The SAE Fatigue Design Handbook (Rice, 1997) gives the following equation as being useful in fitting da/d N versus
K curves:   -The SAE Fatigue Design Handbook (Rice, 1997) gives the following equation as being useful in...                                                                                                                                        The quantities C4 and m4 are new material constants, and Kc and
Kth are material constants as previously defined, with
Kth being a function of R. (a) Describe the shape of the resulting curve on a log–log plot of da/d N versus
K. Qualitatively, how is it affected by changing R? By changing
Kth? By changing Kc? (b) Assume that Kc is known, and also that
Kth is known for various R. How could values for C4 and m4 then be obtained by using a log–log plot of data from crack growth tests at several different R-ratios?

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