The Physical Mechanisms Responsible for the Weathering of Epoxy Resins and GFR Epoxy Resins.
Abstract
Ultrasonic photoelasticity experiments have been used to detect the occurrence of plasticisation of the matrix of polymer matrix composites during water uptake. The experimental programme on steel, soda glass, quartz, epoxy resin system 1009, and a polyester resin composite has now been completed and it has been demonstrated that small changes in bulk properties, such as those resulting from plasticisation caused by water uptake by epoxies, can be detected and distinguished from localised defects such as cavities. The latter are readily identified by the interference patterns which they generate. A program has been developed to give computed images which closely resemble the fringe systems observed experimentally. A novel experiment, designed to permit precise exploration of the interfacial bond between silica and epoxy resin during water uptake, has been developed. In another experiment, dimensional changes which occur in the matrix of fibre reinforced plastics as water is absorbed, are being mapped by measurement of the stress birefringence in the resin between closely packed fibres. Conclusions are drawn from the work reported herein, and from the work described in the 1st Annual Technical Report, October, 1977.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1978
- Accession Number
- ADA062799
Entities
People
- K. H. G. Ashbee
- T. W. Turner
Organizations
- University of Bristol