Accession Number:

ADA636601

Title:

Investigation of Plastic Zone Development in Dynamic Tear Test Specimens - Phase 2

Descriptive Note:

Contractor rept.

Corporate Author:

MARTEC LIMITED HALIFAX (NOVA SCOTIA)

Report Date:

2000-09-01

Pagination or Media Count:

67.0

Abstract:

The development of the plastic zone in dynamic tear DT specimens and a nonstandard three point bending fracture test specimen used to measure fracture properties was the main focus of the study. The ABAQUS finite element software was used to model the elastic-plastic behaviour of the specimens. For the DT specimen, a crack was induced by pressing the notch, followed by fatigue cracking at a limit load level of 40 of the specimen limit load, whereas, the crack shape for the non-standard specimen was a fatigue crack defined at approximately 30 of the limit load. The shapes of these cracks were adequately modelled in the finite element analysis. The specimens were made of 350WT steel and 304 stainless steel materials. The specimens were loaded until fixed amounts of permanent deformation were recorded. Results were obtained in the form of plots, showing the progression of the plastic zone around the crack tip. For each case, the results provide the following mid point plastic deflection, stretch zone width and plastic zone radius. The finite element results obtained were compared to experimental elastic plastic testing where available, and reasonably accurate agreement was achieved.

Subject Categories:

  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE