Shear Lip/Plastic Zone Finite Element Model Development

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Authors
  1. Gallant, B.K.
  2. Koko, T.S.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Abstract
This study focused on the development of shear-lip in DT specimens under quasi-static loading rate. The objective of the study was to demonstrate the feasibility of a numerical simulation of shear-lips for a 25mm base metal DT specimen in three-point bend test. Three real stress-real strain curves representing three different materials with varying degrees of plastic behaviour were considered. These material curves are designated as Curves 1, 2 and 3. Curve 1 represents the actual real-stress- real-strain curve of the 350WT steel material. On the other hand, Curve 2 represents the same curve, but with the fracture strain reduced to half that of Curve 1; while Curve 3 represents a similar curve as Curve 1, but with the yield stress reduced to half the Curve 1 value. Crack advance and element or node release was based on two possible criteria, namely (a) when the average strain in the crack tip elements that occupy a physical surface of 1.25 mm (0.050 inches) exceeds the strain at fracture on the supplied data; and (b) when the strain energy density in elements occupying a volume defined by 1.25 mm (0.050 inches) of free surface at the crack tip and 1.25 mm (0.050 inches) of material depth exceeds the strain energy density calculated from the supplied real stress real strain curves. It was shown that the plastic strain contour patterns obtained from the finite element analyses could be used to estimate the shear-lip sizes. At any given crack size (a/W level), the shear-lip size

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Keywords
Plastic Zone Radius;Dynamic tear;Shear lip
Report Number
DRDC-ATLANTIC-CR-2002-178 — Contractor Report
Date of publication
01 Oct 2002
Number of Pages
50
DSTKIM No
CA022688
CANDIS No
519668
Format(s):
CD ROM

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