PSI - Issue 23

C. Skotarek et al. / Procedia Structural Integrity 23 (2019) 463–468 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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It can be seen that there are some differences, but that the overall asymmetry is quite similar. The same applies to the total size of the contact area which amounts to 0.13 – 0.15 mm 2 (all 4 contact areas).

100 µm

a) simulation; red area: contact surface

b) experiment, dark area corresponds to contact surface

Fig. 9: Contact area in press-fit connector , edge length of mesh in simulation equals 20 µm

Crack initiation and propagation as shown in Fig. 5b is not directly accessible in a cohesive zone model as explained above, but is summed up in terms of damage variables. Fig. 10 contains simulation results for the damage state in the contact zone as a function of the loading variable. Fig. 10 shows that the damage process starts from the rim of the cold-welded zone as soon as the pin opens (Fig. 10a) and gradually progresses towards total decohesion (Fig. 10b).

a) immediately after pin opening (0.032 mm bore hole opening)

b) just before specimen failure (0.044mm bore hole opening)

Fig. 10: Damage accumulation process in the contact zone , edge length of mesh equals 20µm

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