PSI - Issue 34

D. Rigon et al. / Procedia Structural Integrity 34 (2021) 154–159 D. Rigon and G. Meneghetti / Structural Integrity Procedia 00 (2021) 000–000

157

4

∆K th,LC, (R=0 .5 ) = 1.68 · l

0.203 +5.94·HV -0.26 (4) The fitting surfaces are compared with the experimental data in Fig. 2 for each load ratio, together with the residuals. To visualize more clearly the goodness of the estimations, Fig. 3 reports the comparisons between the experimental and e stimated ΔK th,LC,(R) . It is seen that all ΔK th,LC,(R) values relevant to both AM and CM materials are fairly well estimated by equations (2-4) within an error band of ±20%.

R=-1

R=-1

a)

b)

R=0

R=0

c)

d)

R=0.5

R=0.5

e)

f) Fig. 2. (a,c,d) Comparisons between experimental data taken from the literature with estimated ΔK th,LC,(R) for the load ratios R=-1, R=0 and R=0.5; (b,d,f) residuals between experimental and estimated values (from (Rigon and Meneghetti 2020, 2021)).