Why Do Bimetallic Terminals Sometimes Experience Loosening Of Contact After A Period Of Use?

The clamping force of the internal metal contact surface of bimetallic lugs will change with temperature fluctuations. bi metal cable lug During the process of thermal expansion and contraction, due to the difference in the coefficient of thermal expansion of different metal materials, periodic micro-displacements will occur. This repeated variation causes deformation of the fixed component, leading to a decrease in the clamping force at the contact point. This type of thermal cycle combined with mechanical vibration promotes micro-wear at the contact interface, exacerbating the loosening trend.

External environmental factors can also affect the contact status of bi metal lugs connectors. When the bi metallic cable lugs is subjected to external loads such as vibration and impact during long-term operation, these dynamic forces will gradually affect the stability of the fastening structure, causing the originally tight mechanical connection to gradually loosen. Under vibration, "creeping" may occur at the threaded joint, which, after long-term accumulation, manifests as unstable contact.