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The use of precision, continuous modulus measurements to detect the initiation and growth of cracks in a number of experimental conditions will be reported on. The nucleation of cracks in a material will cause a decrease in the elastic modulus of that material. Correlation between the initiation and growth of cracking with a simultaneous decrease in modulus have been obtained. Modulus measurements have been carried out using a modified composite Marx oscillator with specially designed samples. The modulus was calculated from the resonant frequency of the composite oscillator. Comparisons of experimental data with theoretical treatments given in the literature will be provided.
crack detection, crack growth, modulus measurements, stress corrosion cracking, cathodic charging, exfoliation
Professor of Physics, University of Denver, Denver, CO