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This paper investigates the interdependencies of a cantilever beam modal behavior, its dynamic response and crack growth. A methodology is proposed which can predict the crack growth in a metallic beam by using its dynamic response only. Analytical and numerical relationships are formulated in between the fundamental mode and the crack growth by using the existing literature and finite element analysis (FEA) software respectively. Relationship in between the dynamic response and modal behavior is formulated empirically. All three relationships are further used to predict crack growth and propagation. The load conditions are considered same in all the experiments for model development as well as for the model validation. Predicted crack growth is 2 compared with the visual observations. The overall error is within acceptable limits in all comparisons. The obtained results demonstrate the possibility to diagnose the crack growth in metallic beams at any instant within the operational conditions and environment.

Instant Dynamic Response Measurements for Crack Monitoring in Metallic Beams