Figure 1 shows the shaft of a disc sander, made of steel, which has a tension of failure ou-900 MPa and a yield stress oyp=750 MPa. The axis goes from having a diameter of 16 mm to another of 18 mm through an agreement radius of 5 mm. The limit of shaft fatigue is 290 MPa. The most severe loading occurs when an object (which is considered punctual) near the periphery of the disc (100 mm from the center of the axis), with force enough to develop a frictional torque of 12 Nm on the shaft. The coefficient Friction between the object and the disk is 0.6. For these conditions described, it is requested calculate the safety coefficient of the shaft at infinite life. objeto 100mm objeto 5mm 50mm empotramiento WWW.

Figure 1 shows the shaft of a disc sander, made of steel, which has a tension of failure ou-900 MPa and a yield stress oyp=750 MPa. The axis goes from having a diameter of 16 mm to another of 18 mm through an agreement radius of 5 mm. The limit of shaft fatigue is 290 MPa. The most severe loading occurs when an object (which is considered punctual) near the periphery of the disc (100 mm from the center of the axis), with force enough to develop a frictional torque of 12 Nm on the shaft. The coefficient Friction between the object and the disk is 0.6. For these conditions described, it is requested calculate the safety coefficient of the shaft at infinite life. objeto 100mm objeto 5mm 50mm empotramiento WWW.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

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Figure 1 shows the shaft of a disc sander, made of steel, which has a
tension of failure ou-900 MPa and a yield stress oyp=750 MPa. The axis
goes from having a diameter of 16 mm to another of 18 mm through an
agreement radius of 5 mm. The limit of shaft fatigue is 290 MPa. The most
severe loading occurs when an object (which is considered punctual) near
the periphery of the disc (100 mm from the center of the axis), with force
enough to develop a frictional torque of 12 Nm on the shaft. The
coefficient Friction between the object and the disk is 0.6. For these
conditions described, it is requested calculate the safety coefficient of the
shaft at infinite life.
objeto
100mm
0+
objeto
d=16mm
re5mm
50mm
Figura 1. Esquema de la lijadora de disco.
empotramiento
D=18mm

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