Subject :- Machine Design -I

Topic :- Spring

Difficulty :- High

• The most suitable material for springs are those which can store up the maximum amount of work or energy in a given weight or volume of spring material, without permanent deformation.

• The selection of material for the spring wire depends upon the following factors:

  (a) The load acting on the spring.

  (b) The range of stress through which the spring operates.

  (c) The limitations on mass and volume of spring.

  (d) The expected fatigue life.

  (e) The environmental conditions in which the spring will operate such as temperature and corrosive atmosphere

The steels most commonly used for making springs and applications are as follows

High carbon steels - These steels are used for laminated springs for locomotives, carriages, wagons, and for heavy road vehicles.

Chrome-vanadium steels- These steels are used for motor car laminated and coil springs for suspension purposes, automobile and aircraft engine valve springs.

Silicon-manganese steels- These are the usual standard quality modern spring materials and are much used for many engineering purposes.