Class 2 (2nd Engineer) MEKG 📅 Feb 2018

Exam Question

(a) Explain the action of EACH of the following metallurgical mechanisms:

(i) Creep:

(ii) Brinelling

(iii) Fretting

(iv) Fretting corrosion

(b) State with reasons, where EACH of the four mechanisms in (a) above may occur in a ship's propulsion system.

Reference Answer

(a) (i) Creep:
Creep is the slow, time-dependent deformation of a material when it is subjected to a constant stress, particularly at high temperature. Over time, the material slowly elongates or deforms permanently under the applied load, even if the stress is below the material's yield strength.
Action:
Creep occurs because the material's atomic structure gradually shifts under stress, especially at elevated temperatures where atomic movement is more pronounced.

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