SEDL / STP / STP601-EB / STP28647S

Note on the Dependence of Crack Velocity on Driving Force for an Epoxy Adhesive

Mostovoy, S
Senior project director, senior project director, and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

Crosley, PB
Senior project director, senior project director, and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

Ripling, EJ
Senior project director, senior project director, and director of research, Materials Research Laboratory, Inc., Glenwood, Ill.

Pages: 11    Published: Jan 1976

Download this paper for $25 PDF (212K)          View License Agreement
Abstract

The dependence of crack velocity, ˙a, on driving force for an adhesive system was shown to be described by a curve having the shape of an inverted L. That is, at high values of ˙a, large increases in G caused small increases in ˙a while at low velocities, small increases in G cause large increases in ˙a. Since the data in the literature on polymethylmethacrylate (PMMA) and mild steel can also be represented by such a curve shape, the inverted L may represent the general dependence of ˙a on driving force.

The high velocity branch appears to be associated with rough fracture surfaces and the low velocity branch, with smooth fracture surfaces.