Abstract
Abstract Composite materials are often used as primary structures in important devices, like transport facilities. However, prediction of their work and damage propagation is not easy. Operating of the structure causes delaminations and fibers cracking which are difficult to detect by visual investigation. The paper presents an experiment in which an electrical resistance change method was used for investigating damage in strongly loaded carbon-fiber reinforced plastic composites, where the conducting carbon fiber was used as a sensor for defect detection. The method is shown by which the electric potential difference was measured at the carbon/epoxy composite beam type specimen exposed to the action of pure bending moment.
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