NOTCH EFFECT OF 350WT STEEL PLATE AT HIGH STRAIN RATES

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Authors
  1. Bassim, M.N.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Manitoba Univ, Winnipeg MAN (CAN) Dept of Mechanical and Industrial Engineering
Abstract
The report describes results of fracture toughness studies performed at very high strain rates, on compact tension specimens of 350 WT. Several notch configurations were used including a saw cut and pressed notch, an EDM notch and a saw cut followed by a fatigue precrack. Two specimen orientations were tested, namely T-L and L-T orientations. The specimens were tested using a specially designed Split Hopkinson Bar equipped with a swing arm mechanism. The testing was performed in the temperature range of -45C to 15C in steps of 15C. The shear lip on the broken specimens was measured as also the stretch zone width using a scanning electron microscope. Whenever the specimens broke totally, shear lip and sketch zone transition curves were obtained. The results clearly demonstrate the effect of notch acuity and crack orientation on the fracture toughness of 350 WT Steel.
Keywords
Split Hopkinson Bar;Shear Lip;SZW;Stretch zone;350WT steel;High strain rate
Report Number
DREA-CR-97-418 — Contractor Report
Date of publication
01 May 1997
Number of Pages
36
DSTKIM No
98-00403
CANDIS No
507002
Format(s):
Hardcopy;Document Image stored on Optical Disk

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