Accession Number:

ADA270068

Title:

Fracture Study of a Polyacetal Resin

Descriptive Note:

Journal of Materials

Corporate Author:

MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)

Report Date:

1992-01-01

Pagination or Media Count:

9.0

Abstract:

Fracture experiments have been carried out with unnotched and notched tensile specimens of polyacetal resin at room temperature at various rates of extension. An increase of approximately 13 in yield stress was observed in the unnotched tests with increased deformation rates from 1-1000 mmmin. Whilst strain to failure was reduced from about 85 to approximately 0.05. In all specimens, failure appeared to have taken place by initiation of a microscopic flaw upon yielding, and this flaw then slowly grew into a critical size when catastrophic fracture set in. In the slow-growth region, the mechanism of failure was by void growth whereby the lamellar texture was transformed into a fibrillar one. However, on the rapid fracture surface, there was evidence of lamellar texture being retained, but with small voids in the stacks of lamelae.

Subject Categories:

  • Organic Chemistry
  • Polymer Chemistry
  • Plastics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE