Author(s)

I. Cerny, M. Kneifl & V. Linhart

Abstract

Measurements of critical parameters of fracture and fatigue crack growth under mono- and biaxial loading, parameters of leak-before-break, performed usually on laboratory specimens, are often needed to be verified on large scale samples, components or structures. For these measurements, exact information on crack length and profile is an essential condition for performing valid and reproducible tests. As optical methods do not provide any information on internal crack profile, indirect methods have to be used A modification of direct current potential drop (DCPD) method has been proposed and experimentally verified for: (i) cracks in rectangular specimens of great thickness, (ii) surface fatigue cracks in thick pipes, (iii) through-thickness cracks in pipes with placement of electrodes near crac

Keywords