Shape memory alloys for power connector applications

Abstract

A study evaluating the use of a Shape Memory Alloy (SMA) as an active force actuator in power connectors has been conducted. The work consisted of three parts: 1) A selection of a suitable candidate for evaluation; 2) Laboratory testing of relevant properties of the selected SMA; 3) Experimental verification of the proposed function. The findings of the work are the following: 1) A commercial CuAlNi Shape Memory Alloy was selected to be tested as an active force actuator in bolted power connectors; 2) The use of such a SMA washer as an active force actuator significantly lowers and stabilises the contact resistance in a bolted connector, in accordance with the predictions.