Abstract
To more effectively quantify constraint effects on crack-tip fields and fracture resistances in ductile materials, a modification of the J-Q theory (O'Dowd and Shih, 1991) is proposed by introducing a parameter Q*. Results show that Q* is a load-independent constraint parameter under LSY or fully plastic deformation. The validity of J-Q* description has been demonstrated by three applications to: (a) predict crack-tip fields without further FEA calculations; (b) rank constraint levels for different fracture specimens; (c) predict constraint-corrected J-R curves.
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