PSI - Issue 14

Vamsi Inturi et al. / Procedia Structural Integrity 14 (2019) 937–944 Vamsi, Sabareesh, Vaibhav/ Structural Integrity Procedia 00 (2018) 000–000

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As the tooth thickness of the pinion is 4.5 mm, the crack is cut up to 1.9 mm, which is assumed to be 50% faulty case (F1) in the current investigation. Similarly, another crack along the axial direction is seeded up to 3.8 mm, which is presented as 100% faulty case (F2). Table 1. Details of experimental test rig S.No. Name of the parameter Description/Value 1 Model of gearbox Three-stage parallel spur gearbox 2 Number of teeth on pinion (HSS, ISS & LSS) 20, 20 & 20 3 Number of teeth on gear (HSS, ISS & LSS) 80, 80 & 60 4 Pressure angle 20 0

Fig. 1. Bench top of the experimental test rig

Fig. 2. Schematic diagram of experimental test rig Similarly, another type of local fault, tooth chip (axial direction) is created on one of the pinion teeth’s face. Since the whole depth of the pinion is 6 mm from the root, the portion up to 1.5 mm is removed, which is assumed to be 25% faulty case (F3). Again, the whole depth of the pinion (6 mm) along the face width is removed, which is presented as 100% faulty case (F4). The fault dimensions are specified in Table 2 and are as shown in the Fig. 3.