Increase of Technical Strength of Mechanically Gripped Fiberglas Rods by Surface Treatment

摘要

Epoxy-matrix fiberglas rods were pulled to fracture in simple tension using standard conical chuck cable grips with serrated gripping surfaces. Failure of the rods always initiated in the grip area. A number of specimens was soaked in a special solution for a short period of time prior to testing. The technical strength of the treated specimens was from 10-15% greater than the untreated ones. The increased toughness and ductility of the treated surface is thought to 'blunt' the stress distribution by material flow in the areas of concentration created by the mechanical grips. In particular, the initiation and propagation of cracks is inhibited by this solution softening of the gripped surface area. (Author)