Investigation of plastic zone development in dynamic tear test specimens - phase II


  1. Koko, T.S.
  2. Gallant, B.K.
  3. Tobin, S.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
The development of the plastic zone in dynamic tear (DT) specimens and a non-standard 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 elements results obtained were compared to experimental elastic plastic testing where available, and reasonably accurate agreement was achieved.
350WT steel;Dynamic Tear Transition Curve;Elastic Plastic Fracture Toughness;Fracture transition;Plastic Zone Radius;Stretch Zone Width;Plastic zone around the crack tip;Fracture properties;Computer programs (ABAQUS);304 stainless steel
Report Number
DREA-CR-2000-115 — Contractor Report
Date of publication
01 Sep 2000
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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