Keyword: «crack speed»

To experimentally determine the rate of crack branching, a series of tensile tests of PMMA samples were carried out at different temperatures, for fracture by internal pressure of thin-walled cylindrical steel shells (vessels) with crack velocity measurement by the method of rupture of conductive strips. A measuring system has been created based on a precision signal converter for resistance thermometers and thermoparks «Tercon» connected to a computer. The crack velocity was measured during rectilinear crack propagation and during crack branching.