DESIGN OF SHAFTS

MATERIAL USED FOR SHAFT (Alloy steel such as nickel ,nickel- chromium ,chrome vanadium)MANUFACTURING OF SHAFT (HOT ROLLING)TYPES OF SHAFT (TRANSMISSION AND MACHINE SHAFT)STANDARD SIZES (5m,6m,7m)STRESSES IN SHAFT (SHEAR ,BENDING AND COMBINED)

DESIGN OF SHAFTS

• # SHAFT SUBJECTED TO TWISTING MOMENT ONLY

• # SHAFT SUBJECTED TO BENDING MOMENT ONLY

• # SHAFT SUBJECTED TO COMBINED TWISTING &BENDING MOMENT

• # SHAFT SUBJECTED TO AXIAL LOADS IN ADDITION TO COMBINED TORSION AND BENDING LOADS

SHAFTS SUBJECTED TO TWISTING MOMENT ONLY

SHAFTS SUBJECTED TO TWISTING MOMENT ONLY

HOLLOW SHAFT

SHAFTS SUBJECTED TO TWISTING MOMENT ONLY

TWISTING MOMENT FROM POWER TRANSMITTED

FOR BELT DRIVE ,THE TWISTING MOMENT IS GIVEN BY:

SHAFTS SUBJECTED TO BENDING MOMENT ONLY

HOLLOW SHAFT :

SHAFTS SUBJECTED TOCOMBINED TWISTING &BENDING MOMENT

• Maximum shear stress theory or Guest's theory. It is used for ductile materials such as mild Steel

• . Maximum normal stress theory or Rankine’s theory. It is used for brittle materials such as

cast iron..

shear stress theory or Guest's theory.

• τ = Shear stress induced due to twisting moment, and

• σb = Bending stress (tensile or compressive) induced due to bending

• moment.

shear stress theory or Guest's theory.

MAX NORMAL STRESS THEORY

EQUIVALENT TWISTING MOMENT:

SHAFTS SUBJECTED TOCOMBINED TWISTING &BENDING MOMENT

IN CASE OF HOLLOW SHAFT :

PROBLEMS

SOLUTION

EQUIVALENT TWISTING MOMENT

EQUIVALENT BENDING MOMENT:

PROBLEM

PROBLEMS

SHAFT SUBJECTED TO FLUCTUATING LOADS

EQUIVALENT TWISTING MOMENT:

EQUVALENT BENDING MOMENT:

RECCOMENDED VALUE FOR SHOCK AND FATIGUE FACTORS