Development of a Procedure to Measure Failure Strain of Smooth Tensile Specimens at Various Strain Rates

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Authors
  1. Gholipour, J.
  2. Chiriac, D.
  3. Wanjara, P.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);National Research Council, Montreal QC (CAN) Aerospace Manufacturing Technology Centre
Abstract
This contract report describes the development of a method for measuring true facture strain at moderate strain rates that was developed by the National Research Council of Canada. Smooth tensile specimens of CSA 350WT cat 5 steel were tested at displacement rates that corresponded to approximately 0.03 to 5.5 mm/mm/minute. Global and local strain data was collected using ARAMIS optical 3D deformation analysis and global strains were confirmed with a laser extensometer. The data was analysed to produce engineering stress-strain and true stress-true strain curves. The results indicate that it is possible to measure the true local strain at failure, and it is likely the methodology could be applied to specimens with different stress triaxialities (i.e., varying notch severity).

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Report Number
DRDC-ATLANTIC-CR-2013-153 — Contract Report
Date of publication
01 Aug 2013
Number of Pages
82
DSTKIM No
CA039984
CANDIS No
801014
Format(s):
Electronic Document(PDF)

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