PSI - Issue 46

A. Wetzel et al. / Procedia Structural Integrity 46 (2023) 10–16 Anna Wetzel et al. / Structural Integrity Procedia 00 (2019) 000–000

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The tensile tests are performed with the materials testing machine ME-8236 from Pasco as depicted in Fig. 6.b). In order to obtain reliable results, the displacement is measured with the tactile extensometer DD1 from Hottinger Baldwin Messtechnik (HBM). Special rope grips are used to minimize the preload force of the gripping jaws. Due to the usage of a tactile extensometer, the tensile tests were stopped before reaching the fracture limit to prevent damaging the extensometer. The setup of the bending tests is shown in Fig. 6.a). The strand is fixed on one side in a gripping jaw. A thin wire is wrapped around the other end to create a loop to which a mechanical force sensor is connected. Using a video analyzing tool, the displacement in the y-direction is measured. The torsion tests are performed on a self-constructed setup. A simplified sketch is depicted in Fig. 6.c). One end of the strand is fixed, the other end is fixed in a gripping jaw that can rotate around as well as translate along the z-axis. A torque sensor of the type 8641 from Burster and a force sensor from HBM of the type U3C is also integrated.

a)

b)

c)

Fig. 6. Experimental setup of a) bending test, b) tensile test, c) torsion test.

5. Results The following graphs of Fig. 7. compare the experimental results of the three load cases applied to the core strand with the two FE-models. Although all experimental tests were performed at least three times, only one representative test, respectively the mean values, are shown in the graphs.

a) tension

b) bending

c) torsion

Fig. 7. Results for a) tension, b) bending, and c) torsion tests of the two FE-models and the experiments.