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TECHNICAL PAPERS

A Comparative Study on Various Ductile Crack Formation Criteria

[+] Author and Article Information
Yingbin Bao, Tomasz Wierzbicki

Impact and Crashworthiness Laboratory, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139

J. Eng. Mater. Technol 126(3), 314-324 (Jun 29, 2004) (11 pages) doi:10.1115/1.1755244 History: Received September 15, 2003; Revised January 16, 2004; Online June 29, 2004
Copyright © 2004 by ASME
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References

Figures

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Undeformed specimens: (a) upsetting specimens; and (b) tensile specimens
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Specimens at different stages of compression
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Deformed specimens with different aspect ratios
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Stress-strain curve from upsetting and tensile tests
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Deformed tensile specimens (a) smooth; (b) r=12 mm; and (c) r=4 mm, where r is the radius of the notch
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Evolution of the equivalent plastic strain (upsetting)
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Comparison of force-displacement response (upsetting)
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Evolution of equivalent plastic strain (smooth)
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Comparison of force-displacement response of experiment and numerical simulations for the smooth round bar. Relative elongation is the read of the extensometer divided by the initial gauge length of the extensometer
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Comparison of force-displacement response of experiment and numerical simulations for the notched bar with 12 mm radius of notch
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Comparison of force-displacement response of experiment and numerical simulations for the notched bar with 4 mm radius of notch
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Deformed shapes of tensile test specimens: (a) smooth; (b) R=12 mm; and (c) R=4 mm
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Material constants of fracture criteria for A12024T351, A: upsetting (d=12.5 mm,h=25 mm), B: upsetting (d=12.5 mm,h=12.5 mm), C: standard round, D: notched round (r=12 mm), E: notched round (r=4 mm)
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Fractograph showing dimples in the tensile specimen (r=4 mm)
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Fractograph showing flat fracture surface in the upsetting specimen
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Void nucleation, growth and linkage in the tensile specimen (r=4 mm)
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“Shear fracture” through the matrix in the upsetting specimen
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A fracture curve in the equivalent strain and stress triaxiality space
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A photograph of specimens used to calibrate A12024-T351 for failure locus
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Comparison of the present and Johnson-Cook fracture locus
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A possible mode transition between the void growth dominated mode and “shear fracture” dominated mode

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