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On the Influence of Strain-Path Changes on Fracture.
PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Abrupt changes in strain path between uniaxial and equibiaxial tension are shown to have a large effect on plane-strain ductility. Data for titanium sheets, both with and without hydrides, show that a significant ductility enhancement occurs at a final strain state of plane-strain tension following multi-stage deformation sequences comprised of uniaxial and equibiaxial tension. While the dependence of ductile fracture on both accumulated damage and strain hardening suggests that failure strains should be sensitive to a nonproportional strain-path history, the detailed causes of the present effect is not known. Keywords FractureMechanics, Strain paths, Plane strain, Uniaxial tension, and Titaniumalloys.
APPROVED FOR PUBLIC RELEASE