PSI - Issue 42

Stefan Sieberer et al. / Procedia Structural Integrity 42 (2022) 72–79

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S. Sieberer et al. / Structural Integrity Procedia 00 (2019) 000–000

3

10mm 10 mm

Fig. 1. Calculated fibre trajectories and photography of AM layers using research oriented software: left: calculated major (black) and minor (red) in-plane principal strain directions for fibre placement, and right: printed single CCF layer of lug specimen based on calculated principal strain directions.

Fig. 2. Drawing of the test specimens. The hatched area is CCF printed, the outer perimeter is SCFRP only.

fraction in major strain direction φ on the part strength and sti ff ness. Table 1 gives the printed layer settings and calculated fibre volume fractions of the specimens. The values of φ were provided by the manufacturer of the CCF filament and are approximate values.

Table 1. Test specimen characteristics. Specimen

Layer height ( t )

CCF layers ( n )

Fibre vol. fraction ( φ )

Specimen 1 Specimen 2 Specimen 3

0.20 mm 0.30 mm 0.30 mm

26 17 17

0.37 0.27 0.27

2.2. Test Set-up

Figure 3 shows the specimen in the test facility. The static tests were performed on a Zwick-Roell hydraulic cylinder test rig using MTS 647 hydraulic grips for clamping of the shaft. A steel bolt with diameter matching the eye diameter