PSI - Issue 66

34 Carl H. Wolf et al. / Procedia Structural Integrity 66 (2024) 26–37 Carl H. Wolf, Sebastian Henkel, Christian Düreth, Maik Gude and Horst Biermann / Structural Integrity Procedia 00 (2025) 000–000 9

impeding the movement of the crack edges in the direction of crack growth or rather the crack path, so that the crack growth rate is significantly reduced. However, no comparative FE calculations have yet been carried out for this case. (a) (b)

(c)

(d)

(e)

(f)

Figure 7: Determination of the energy release rate using the example of a #160 specimen, which was loaded with F tension = 2.75  2.25 kN and F compression = 0.5 kN at a number of load cycles of N = 25,000.(a,c,e) Course of the displacements  4, S ,  4 , T and ,  4 for the individual images of the sequence at the respective points in time resulting from (a) the Mode I loading and (c) the Mode II loading as well as (e) the measured total displacement. (b,d,f) Crack growth plot with the determined energy release rates for (b) Mode I energy release rate, (d) Mode II energy release rate and (f) equivalent energy release rate.