Skip to main content

Creep vs Fatigue failure of Components

Creep is phenomenon in which time dependent deformation takes place.
Eg. When an wire is installed it is straighten while after sometime due to its own weight sagging takes place.

Fatigue failure is a phenomenon in which components subjected to cyclic stress .
It can be analyzed with SN Curve.
Approx 90% of the machinery failure happens due to this .
Eg. Tie rod of main engine .

Labels:

Comments

Post a Comment

Popular posts from this blog

Wire drawing effect

Wire drawing effect : It is erosion or scoring of valve seat and disc material of the valve . Causes : 1. Due to differential pressure across the valve . 2. Thermal and mechanical damages . Effects : Valve is unable to isolate the line and fails in sealing . Gas and liquid will leak from the wire and scratch like groove .
Post a Comment
Read more

Cross and loop scavenging Disadvantage

Cross scavenging Disadvantage 1. It requires longer  piston skirt to prevent exhaust gas and air leaks from the ports when piston is at TDC . Loop scavenging Disadvantage 1. Both exhaust port and scavenge port are at the adjacent side of the liner which causes temperature differential problem for the liner material . Hence , we are using mostly the uniflow scavenging which is having very lesser mixing and better scavenging efficiency. Source : DA Taylor
Post a Comment
Read more