PSI - Issue 5
Daniel Kujawski et al. / Procedia Structural Integrity 5 (2017) 883–888 Daniel Kujawski/ Structural Int grity Procedia 00 (2017) 00 – 000
5
887
Stress, or a
0
Strain, or a
Fig. 2 An illustration of graphical solution for monotonic and cyclic stresses and strains.
It can be noted that for a given material the solution of Eq. (11) depends solely on the product of S a k t .
3.2. Neuber’s “master” curve method Solving simultaneously the Ramberg- Osgood relationship and Neuber’s rule, Eq. 8 and Eq. (10) , and plotting the results in terms of the product of Sk t , versus the actual notch-root strain, , the so called Neuber’s “master” curve is obtained, Fig. 3. For a given value of the product, Sk t , the corresponding notch-root strain, , is determined directly from Neuber’s “master” curve. The related notch-root stress, , is established from the Ramberg-Osgood relationship for the same value of . It is seen from Fig. 3 that Neuber’s “master” curve is solely material dependent.
2500
SAE 1045 steel
2000
Sk t ,
1500
Stress, or Sk t (MPa)
Neuber's master curve
1000
Ramberg-Osgood
500
0
0
0.01
0.02
0.03
Strain,
Fig. 3 Ramberg- Osgood and Neuber’s “master” curve.
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