A pickup truck tailgate cable having a breaking strength of 4000 lb is fabricated from 7 x 19 braided carbon steel wire. To prevent corrosion, the 5-mm-diameter cable is galvanized and covered with a weather resistant heat shrink tube made of cross linked polyolefin. The ends of the tailgate cable are sealed with epoxy during manufacturing. Because of its geometry and specific end fixtures, the cable bends and twists when the pickup truck tailgate is raised and lowered. The twisting and bending opens and closes the seven cable wire bundles located within the polyolefin tube. List and then comment on the possible reasons why the galvanized cable might corrode and break within a few years of initial use and describe what could be done to improve the design (see Figure P9.12D).
