Abstract:

In order to quantify the relationship between the local defect of the aluminum alloy wire and the resistance heating, and explore the influence of the resistance heating on the ignitability of the wire, this paper simulates the situation that the AA8176 aluminum alloy wire is partially damaged by mechanical damage. Powering on overcurrent, observe the smoke and heat phenomenon of the wire, and study the heating law at the local defect of the aluminum alloy wire induced by mechanical damage. It is found that the temperature at the local defect of aluminum alloy wire is negatively correlated with its line diameter and cross-sectional area when 1.5 times and 2 times of overcurrent are applied. The average time of fume emission and insulation carbonization of aluminum alloy wires is shorter than that of original wires and damaged wires of upper insulation, which indicating that the fire risk is increased. 

Key words: fire protection, fire investigation, resistance heating, aluminum alloy wire, mechanical damage