Abstract

Resonance ultrasound spectroscopy has been used for material characterization such as measuring elastic constants of single and polycrystalline materials. An extension of this technique which utilizes higher amplitudes and different boundary condition called Nonlinear resonance ultrasound spectroscopy has become popular for understanding dynamic response of materials, specifically, highly nonlinear, hysteretic materials like geomaterials. Recent advances have used this for nondestructive material characterization of metallic and composite structures, along with nondestructive evaluation. NRUS typically looks for a frequency shift with increasing excitation amplitudes. The present work explores the influence of residual stress on NRUS experiments using cold rolled low carbon steel with varying thickness. The acoustic nonlinearity parameter was measured using an analytical inversion approach proposed earlier. A comparison of the beta of samples, showed that they followed a linear pattern. Next, the samples were heat treated for stress relieving but annealing. The beta measurements were repeated and a decrease in beta could be observed. A second round of heat treatment was carried out, and beta was measured again. The post heat-treated betas were all nominally similar irrespective of thickness. The results were also compared against with X-Ray diffraction measurements. The Hikata-Chick-Elbaum dislocation model was further used to study the effect of internal stress

How to Cite:

Huanes-Alvan, G., Chakrapani, S. & Barnard, D., (2019) “Infuence of dislocations and residual stress on nonlinear resonance spectroscopy experiments”, Review of Progress in Quantitative Nondestructive Evaluation .