PSI - Issue 41

A.R.F. Soares et al. / Procedia Structural Integrity 41 (2022) 48–59 Soares et al. / Structural Integrity Procedia 00 (2019) 000 – 000

55

8

parts were machined in a CNC lathe, in all cases following the standard practices (Krar et al., 2011). All the perforations done during the machining were subjected to tolerances (H7), whilst the parts’ roughness was ISO N8. 3.3.3. Final layout Upon completion of all the machining and cleaning of the parts, a black oxide coating was applied to prevent them from rusting. Subsequently, the device was assembled following the design. The assembled prototype is shown in Fig. 6.

Fig. 6. Final device assembled and showing the black oxide coating on the machined parts.

4. Equipment validation After manufacturing the designed equipment, it is necessary to perform different experimental tests and respective data processing to validate its operation, by obtaining several mixed-mode combinations, using only the equipment itself and the same type of test specimen. Thus, the materials to be used and the joint geometry were initially defined, followed by testing and data analysis. 4.1. Geometries and materials Adhesive joints are always manufactured based on two main materials, the adherends and the adhesive, which have different properties, each with different functions in the overall performance of the adhesive joint, either for different environments or loading conditions. The specimen geometry and mechanical properties used in the adherends of the SPECIMEN-DCB component are presented in Fig. 7 and Table 1, respectively.

Fig. 7. Schematic presentation and dimensions of test specimen DCB.