PSI - Issue 28

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J. Weiland et al. / Procedia Structural Integrity 28 (2020) 1249–1257 Weiland et al. / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 3: Stress-strain-diagram axial direction loading for Asahi Kasei DB-500 - representative curve

Fig. 4: Stress-strain-diagram tensile loading for 3M Scotch-Weld DP 609 - representative curve

3.3. Manufacturing of the single lap joint with integrated POF The specimen material for the single lap joint is S700MC and has the dimension of 120 mm x 25 mm and a thickness of 3 mm. The thickness of the adhesive layer is 1.5 mm and the overlap length is 25 mm, both controlled by PTFE strips. The POF is integrated transversely - 90° to the application of force - in the symmetrical center of the single lap joint. The dimensions are shown in Figure 5. Before bonding, the test specimens were cleaned with isopropanol, mechanically roughened and again cleaned with isopropanol. To integrate the POF exactly in the symmetrical center of the joint, a 3D printing device was used. Before the POF was integrated into the adhesive layer, it was cleaned with isopropanol and pre-treated with a vacuum plasma process. Therefor the Tetra-5-LF (0.1 mbar - 7.5 min – 25 W – O2 as process gas) from Diener electronic GmbH + Co. KG, Ebhausen Germany, was used. The different manufacturing steps to integrate the POF are shown in Figure 5. The curing conditions for the samples were 7 days at room temperature. For this investigation, five single lap joints with integrated POF were produce.