Computation of fracture toughness of giant magnetostrictive material


  1. Koko, T.S.
  2. Rushton, P.A.
  3. Norwood, M.E.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);MARTEC Ltd, Halifax NS (CAN)
Magnetostrictive materials such as Etrema Terfenol-D are classified as smart materials, which, when subjected to a magnetic field, experience internal strains, and conversely, when subjected to mechanical strains, experience a magnetic field. The most limiting factor impeding the use of magnetostrictive materials lies in their inherent susceptibility to brittle fracture. Previous studies at DREA have led to the development of a new mechanical device for mode II fracture testing of magnetostrictive matrials in the presence or absence of a magnetic field. The test specimen is cylindrical in shape, 6.35 mm in diameter, 25.4 mm in length, with a 20 mu m wide EDM notch extending through its diameter for a distance of 6.35 mm along its length. The present study applies finite element technology to support these epxerimental investigations, thereby lending assistance in the assessment of mode II fracture toughness for magnetostrictive materials. This is an initial exploratory effort, in which the fully coupled non-linear behavior of the material is not considered. Rather, a methodology for converting the applied magnetic field to an equivalent mechanical load, based on the material's magnetostrictive properties, is devised and applied. The DSA-VAST finite element software was employed to produce a model comprised of conventional solid elements, and also featuring DSA's enriched twenty-noded solid fracture element. TRUNCATED

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Terfenol;Magnetostrictive materials
Report Number
DREA-CR-2001-090;MARTEC-TR-01-07 — Contractor Report
Date of publication
01 May 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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