PSI - Issue 12

Andrea Mura et al. / Procedia Structural Integrity 12 (2018) 52–57 Mura et Al./ Structural Integrity Procedia 00 (2018) 000 – 000

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Fig. 4. Pressure distribution in case of misaligned shafts at 400Nm torque.

Fig. 4 shows in the top side the unloaded flank of the spline teeth and in the bottom side the loaded flank in the simulation with 0.5° misalignment. The unloaded flanks do not show any contact pressure, this demonstrate that no interference between engaging teeth is created by the misalignment. It is possible to appreciate that the misalignment brings to not uniform contact pressure distribution among engaging teeth. In particular, the maximum load is shared by teeth from #5 to #14. This loading distribution justify the generation of tilting moment.

Fig. 5. Deformation of misaligned shaft at 400Nm torque

Fig. 5 shows the deformation of the misaligned shaft due to the transmitted torque. As expected, the maximum deformation is located near the spline coupling.

Table 1. Comparison between numerical and theoretical results. Misalignment Angle [°] Torque [Nm] M1 [Nm] M2 [Nm] Mt [Nm]

Numerical Mt [Nm]

Diff. %.

0.50

400

1.113

0.014

1.114

2.495

-124%

0.50

800

2.227

0.038

2.228

2.561

-15%

Simulations results have been compared to tilting moment values obtained by theoretical model. The results are shown in Table 1. It is possible to observe that theoretical model gives values closer to numerical model with high torque, while with lower torque the theoretical value is less than half of the simulated one.