Goodman FAD, Goodman Fatigue Analysis Diagram, is prepared for engineers and students to solve fatigue strength problems easily.Fatigue, or metal fatigue, is the failure of a component as a result of cyclic stress. When the component is to be designed for infinite life, the endurance limit becomes the criteria of failure. The amplitude stress induced in such components should be lower than the endurance limit in order to withstand infinite number of cycles. Substantial amount of testing is required to obtain an SN curve for the simple case of fully reversed loading, and it will usually be impractical to determine whole families of curves for every combination of mean and alternating stress. Therefore, the Goodman diagram approach, constructed with mean stress as the abscissa and alternating stress as the ordinate, and a straight lifeline from endurance stress point on alternating stress axis, to the ultimate tensile stress point on mean stress axis, is used. Then for any given mean stress, the endurance limit, the value of alternating stress at which fatigue fracture never occurs can be read directly as the ordinate of the lifeline at that value of mean stress. Goodman FAD calculations can be carried with either residual stress method or nominal mean stress method. Goodman Diagram constructed automatically once all parameter are entered. Critical points are calculated and given on diagram and judgement belongs to the user based on these points.Users can save and load basic diagram parameters.