Machine vision is used to track nodes on the perimeter of a target and associated with a body undergoing cyclic loading. The node movement is related to calculate strain through principles of Finite Element Analysis. The calculated strain is used to determine fatigue damage in the body based on an equation and data obtained using strain-controlled test methods. A finite element analysis fatigue gage includes a sensor to capture the total image of the target and to output data representing the total image; a computer program for isolating the target's perimeter using edging algorithms and the data, tracking the movement of perimeter nodes of the target as the body undergoes deformation and recording the displacement, and manipulating the data on node movement using nonlinear stress analysis, finite element analysis, and material properties and characteristics and an equation based on strain-controlled test methods; and a data display.
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