In today’s structural design, fatigue and damage tolerance analysis have become most important and challenging task for the designers because of failure of structure due to different type of damages. Some of these damages have caused a loss of entire structure i.e. Whole Aircraft Itself. Modeling of different type of damages like Cracks, Dents, Nicks, Gouges, and Scratches, Estimation of Strength, Life using Fatigue Analysis and Crack Growth using Lefm approach of components with defects is very essential for their acceptability for the desired function.

This paper presents details of the types of damages that are expected to occur during manufacturing and in service induced damages. In this presentation, TCS shares its experiences in carrying out the Allowable Damage Limit (ADL) analysis of metallic material of a transport aircraft.