Abstract
Abstract Strain distribution is an important indicator of stress concentration, damage initiation and evolution. Many dielectric materials sustain very large strain before failure. In this paper, a near-field microwave high-resolution imaging (NMHI) system is presented to estimate very large deformation. The sensitivity of the microwave imaging system to the dielectric property and geometric changes have been utilized in the present work. A multi-modality data fusion technique is applied to experimentally evaluate the strain in ASTM-D638 standard dog bone structure made of Polyamide 11 (PA-11) material. Plastic strain in the range of 0.3–0.7 has been successfully correlated to the microwave probe response in PA-11 materials. The comparison of strain distribution obtained from NMHI and digital image correlation (DIC) indicate the potential of NMHI as a fast, non-contact method to estimate large mechanical strain.
Published Version
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