Identifying fatigue damage under varying environmental conditions

Document Type

Conference Proceeding

Date of Original Version



In this paper, a nonlinear dynamics based damage detection approach developed in previous work is modified and applied to identify fatigue damage under varying environmental conditions. A fatigue crack is initiated by a machined notch in a cantilever beam that vibrates in a magnetic potential field perturbed by two electromagnets. Change of environmental conditions is simulated by altering supply voltages of the electromagnets. Feature vectors corresponding with influence of the varying environmental conditions are located in a damage-tracking matrix. By removing these feature vectors, the influence of the environment is isolated. Then the propagation of the fatigue damage is identified using smooth orthogonal decomposition.

Publication Title

Proceedings of the 2006 SEM Annual Conference and Exposition on Experimental and Applied Mechanics 2006



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