Investigation of plastic zone development in dynamic tear test specimens - Phase III

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Authors
  1. Koko, T.S.
  2. Gallant, B.K.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
This study is a continuation of efforts to investigate plastic zone development in three-point bend fracture specimens to provide an understanding of crack tip blunting (stretch zone) to plastic zone size (radius), in order to be able to predict the upper limit where elastic plastic fracture becomes invalid. Finite element analyses of an 8 mm specimen made of 350WT steel were performed with the aim of investigating the effects of various modeling (mesh) parameters on the behaviour of 2-D finite element models, and 3-D modeling to investigate shear lip behaviour. The ABAQUS finite element code was used to perform incremental elastic-plastic analysis of the specimens. The results computed included the progression of plastic strain, plastic radius (ry), stretch zone width (SZW), and the ry/SZW ratio with plastic displacement. It was found that the plastic radius and maximum plastic strains were not too sensitive to the mesh size around the crack tip, whereas the SZW is highly sensitive to mesh size around the crack tip. Thus the ry/SZW ratio also depends on mesh configuration. In creating meshes around the tip, it is necessary to ensure that the sizes of the elements around the tip are such that several elements are contained in the region from the crack tip to the side of the crack where the yield line intersects the side of the crack. TRUNCATED

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Keywords
350WT steel;Dynamic Tear Transition Curve;Elastic Plastic Fracture Toughness;Fracture transition;Plastic Zone Radius;Stretch Zone Width
Report Number
DREA-CR-2001-121 — Contractor Report
Date of publication
01 Sep 2001
Number of Pages
64
DSTKIM No
CA020202
CANDIS No
516903
Format(s):
Hardcopy;Document Image stored on Optical Disk

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