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APPLICATION OF ENERGY DISSIPATION RATE ARGUMENTS TO STABLE CRACK GROWTH
Author(s) -
Turner C. E.,
Kolednik O.
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb01402.x
Subject(s) - dissipation , tension (geology) , materials science , position (finance) , mechanics , energy (signal processing) , r value (soils) , rotation (mathematics) , structural engineering , geometry , composite material , mathematics , thermodynamics , physics , engineering , compression (physics) , finance , statistics , subgrade , economics
— Energy dissipation rate, D , and crack tip opening angle (CTOA) have been related for large amounts of ductile crack growth in a fully plastic two‐dimensional model of real elastic plastic material. Several J ‐type rising R ‐curves have been constructed and related, some based on the cumulative energy dissipated and some as a characterising term that relates closely to the far‐field J contour value. These two meanings co‐exist but the relationship is geometry dependent. For deep notch bend (DNB) cases the non‐dimensional group L α/ r * (where L is normalised load, α is CTOA and r * defines the position of the instantaneous centre of rotation) governs the value of d J . Certain DNB cases where R ‐curves vary with size are resolved by this group rather than by CTOA itself whereas for centre‐cracked tension there is a higher value of CTOA than for DNB.