Model of Static Destruction of a Copper Conductor during Current Overload

The results of experimental and theoretical studies of the formation of a crack in a copper conductor under the influence of current overload are presented. The conductor was examined using a JSM-6390L scanning electron microscope. A refined mathematical model of the static stress–strain state and destruction of a copper rod under conditions of inelastic bending at temperatures up to 700°C has been obtained. The limiting values of the bending moment and curvature of the copper conductor, causing its rupture after the formation of a crack, have been determined. The calculation algorithm has been brought to the final analytical dependences, allowing them to be used when conducting forensic fire-technical examination or designing electrical wiring.