Verification and Validation of a Single-Edge Notched Tensile Specimen – Modelling Methods, Weld Geometrical Dependence, Through-Thickness Layers and Induced Bending Moments

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Authors
  1. Bayley, C.
  2. Samsonoff, N.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Victoria Univ, Victoria BC (CAN) Dept of Mechanical Engineering
Abstract
Is the finite element method (FEM) a reliable and convenient method to model fractures? To examine this question, FEM models of single-edge notched tensile specimens were generated based on the geometry of their physical counterparts. A study of the number of through thickness elements was conducted to determine that eight elements provides sufficient mesh convergence with calculation times of approximately one hour. Similarly, different methods of modelling the weld geometry were investigated and show that the bottom weld of the plate should be modelled with a hemispherical weld cap, and the weld on the top of the plate with a flat-topped weld cap. Data collected during the pre-cracking of the physical test specimens reveal relatively poor correlation between the experimental and numerical strains. This poor agreement is believed to originate from inaccurate representation of the initial plate straightening moments due to inaccurate representation of the fixtures.

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Report Number
DRDC-ATLANTIC-TM-2010-215 — Technical Memorandum
Date of publication
01 Oct 2010
Number of Pages
60
DSTKIM No
CA035396
CANDIS No
534927
Format(s):
Electronic Document(PDF)

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