# design of machine elements

**Question description**

1)A hollow shaft of 0.5 m outside diameter and 0.3 m inside diameter is used to

drive a propeller of a marine vessel. The shaft is mounted on bearings 6 metre apart and it transmits

5600 kW at 150 r.p.m. The maximum axial propeller thrust is 500 kN and the shaft weighs 70 kN.

Determine :

1. The maximum shear stress developed in the shaft, and

2. The angular twist between the bearings.

A hollow steel shaft is to transmit 20 kW at 300 r.p.m. The loading is such that

2)the maximum bending moment is 1000 N-m, the maximum torsional moment is 500 N-m and axial

compressive load is 15 kN. The shaft is supported on rigid bearings 1.5 m apart. The maximum

permissible shear stress on the shaft is 40 MPa. The inside diameter is 0.8 times the outside diameter.

The load is cyclic in nature and applied with shocks. The values for the shock factors are Kt = 1.5 and

Km = 1.6.

## Tutor Answer

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors