NOTCH EFFECT OF 350WT PLATE STEEL 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)
Abstract
The report describes results of fracture toughness studies performed on compact tension specimens of 350 WT steel with eight different notch configurations. The tests were performed at very high strain rates obtained by using a specially designed swing arm split Hopkinson Bar (SHB) system. The study compared between the effects of the notch acuity on the fracture toughness which was measured in terms of shear lip and stretch zone width. The program, which lasted nine months, involved the following tasks: (i) fabrication of specimens with different notch configurations (ii) fatigue precracking of some of the specimens (iii) testing at high strain rates at room temperature (15C) and at -30C and (iv) measurement of the stretch zone using scanning electron microscopy and the shear lip on the broken specimens. The results indicate that notch acuity has an important effect on the fracture toughness of this steel and has to be taken into consideration in fracture design.
Keywords
Steel plates;Shear lip;Stretch zone;Split Hopkinson Bar;High strain rate;350 WT Steel
Report Number
DREA-CR-96-424;HAL-95-00539-(107) — Contractor Report
Date of publication
01 Mar 1996
Number of Pages
26
DSTKIM No
96-02922
CANDIS No
499452
Format(s):
Hardcopy;Document Image stored on Optical Disk

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