PSI - Issue 46

Adis J. Muminović et al. / Procedia Structural Integrity 46 (2023) 125 – 130 A.J. Muminovi ć et al. / Structural Integrity Procedia 00 (2021) 000–000

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The specimens were produced using Ultimaker 3 FDM (Fused deposition modelling). The drive and driven gears have the same geometry, where the gear design parameters are given in Table 3 and in Fig. 2.

Table 3. Gear parameters Parameter

Value/Type

Type

Spur gear

Modul

4 mm

Number of teeth Pressure angle (α) Tooth and gear width

15

20°

20 mm

Fig. 2. Design parameters of gears

2.2. Experimental Setup The gears are tested using a custom-built gear test rig, shown in Fig. 3. The main parts of the test rig are: a 7.5 kW electric motor (EM) as a power source, a torque and rotational speed sensor, mounted gears, and the braking system. The braking system consists of a mass suspended over a lever. In the experiment, a load torque of 2.4 Nm and a rotational speed of 1200 rpm were applied. The applied torque and speed were measured using the HBM QuantumX data acquisition system. The tests were conducted until the failure of one or both gears occurred. The fatigue life, expressed in the number of revolutions, was recorded.

Lever braking system

Torque and speed sensor

Testing gears

EM

QuantumX data acquisition system (DAQ)

Fig. 3. Custom-made gear-test rig

3. Results and discussion The measured torque for gears with 20% of infill volume is given in Fig. 4. An increase in torque due to the occurring damage to teeth was observed before the failure. Fig. 5a shows the total failure of the drive gear teeth and