Fluid Transport into Crazes under Triaxial Stress.
Abstract
The penetration coefficient of silicon oil (500 cS) into PS during tensile deformation was determined under a range of superposed hydrostatic pressure of 1 to 1200 bars. At atmospheric pressure, the liquid front, driven by a relatively high capillary pressure, was found to lag behind the 'dry' craze tip front. The penetrability was observed to increase as a steep linear function of the pressure up to 80 bars at which the liquid front was forced to reach the craze tip front. At higher pressures, a stage of suppressed penetrability was observed which was associated with a substantial decrease in the craze size and density. The suppressed penetrability is explained on the basis of pressure-induced 'void' reduction competing with its pumping component. An effective axial strain analysis is presented to explain such a reduction. The effect of pressure on the maximum stress at the tip of a flaw, in conjunction with the distribution of surface defects, is found to account for the suppressed craze density at elevated pressures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 25, 1980
- Accession Number
- ADA089193
Entities
People
- Abdelsamie Moet
- Eric Baer
Organizations
- Case Western Reserve University