Some Properties of burnt Electric-Wires

Abstract

In this papaer, some mechanical properties of the electric-wires burnt by a fire were examined to know whether it is possible to use them for construction works, and the relations between the properties and the annealing temperatures or times for the cold-worked copper-wires were investigated to deduce the temperatures and states in which the burnt electric-wires had been exposed. Then the following conclusions were drawn. Regardless of the condition of fire, the properties of the burut electric-wires remained almost unchanged, and the cold-worked copper-wires concluded the recrystallization even after the very short-time annealing, and after recrystallization the properties were remarkably reduced. Velocities of cooling after heating, and the methods of heating did not influence to the properties. And therefore, we learnt that it is impossible to deduce the temperatures and states of a fire from the strength-results of the burnt e1ectric-wires.