LIQUID-INDUCED FRACTURE MARKINGS: AN OVERVIEW

A brief overview of basic types of liquid-induced fracture markings (LIFMs) encountered in glass is presented, based on numerous observations with several glasses and liquids, as well as various specimen geometries and loadings. To accommodate the variety of markings and the range of fractographic evidence, some modifications and reinterpretations of previously defined LIFMs are made, and some new markings included. Subcavitation hackle is interpreted as bands associated with differential liquid transport, seen as fractographic evidence on inhibition of liquid transport to the fracture front in Region I/II transition as well as in Region II of the curve of fracture velocity V(F) vs. the stress intensity factor K(I).