Effect of Loading Rate on Fracture Morphology in a High Strength Ductile Steel

[+] Author and Article Information
A. Venkert, P. R. Guduru, G. Ravichandran

Graduate Aeronautical Laboratories, Mail Code 105-50, California Institute of Technology, Pasadena, CA 91125

J. Eng. Mater. Technol 123(3), 261-267 (Nov 17, 2000) (7 pages) doi:10.1115/1.1371231 History: Received March 01, 2000; Revised November 17, 2000
Copyright © 2001 by ASME
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(a) Schematic of impact loaded three-point bend precracked steel specimen (thickness, t=10 mm, precrack length, ao=30 mm, notch width=0.25 mm); (b) crack tip coordinate system
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Comparison of tunneled regions of the fracture surfaces of 2.3Ni-1.3Cr-0.17C steel under (a) quasi-static, (b) dynamic loading by drop weight (5 m/s), and (c) dynamic loading by impact using gas gun (50 m/s) conditions
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SEM micrographs of void structure in (a) tunneled area and (b) shear lip region. (c) Is a high magnification image of the shear region showing a 0.1 μm size particle (arrowed) that nucleated a microvoid.
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Micrograph of shear dominated area at the crack initiation site
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Molten zones at the tunnel-shear lip interface: (a) 50 m/s impact experiment, (b) 5 m/s impact experiment and (c) 5 m/s impact experiment, at higher magnification.
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Schematic illustration of hydrostatic stress (σkk/3) distribution, (a) along x1 axis and (b) in the thickness direction
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Schematic illustration of shear failure of the ligament at the crack tip: (a) ligament between the blunted crack tip and the voided region subjected to tensile stretching. Illustration of failure modes in plate geometries: (b) a thin strip subjected to tension undergoes shear failure along 45 deg planes and (c) a thick plate subjected to tension undergoes shear failure at the edges and fracture by void growth and coalescence in the interior.



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