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Ductile Damage Evolution and Strain Path Dependency
AIP Conference Proceedings, 2007Forming limit diagrams are commonly used in sheet metal industry to define the safe forming regions. These diagrams are built to define the necking strains of sheet metals. However, with the rise in the popularity of advance high strength steels, ductile fracture through damage evolution has also emerged as an important parameter in the determination ...
Tasan, C.C. +5 more
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Strain‐Softening Behavior of Granular Soil in Strain‐Path Testing
Journal of Geotechnical Engineering, 1992The strain-softening response of a granular soil along a wide spectrum of strain paths is investigated experimentally. Direct strain-path control is achieved by controlling the ratio of volume to axial strain increment using a digital pressure/volume controller. The questions associated with the definition of strain softening are examined.
J. Chu, S.‐C. R. Lo, I. K. Lee
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Stress and plastic strain increment after corners on strain paths
Journal of the Mechanics and Physics of Solids, 1975Abstract The direction and the magnitude of the stress vector were determined for the plastic deformation along the strain path with a corner by subjecting thin-walled tubular specimens made of brass to combined axial load and torsion or to combined axial load and internal pressure. The influence of the comer angle on the strain path and of the pre-
E. Shiratori, K. Ikegami, K. Kaneko
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Internal elastic strains in an IF steel following changes in strain path
Acta Materialia, 1996Residual elastic strains present in an IF steel following rolling and subsequent tensile deformation have been evaluated using X-ray diffraction. It was possible to decompose diffraction profiles into two symmetrical components notionally corresponding to dislocation walls and cell interiors and so estimate the volume fractions and mean elastic strains
D.V. Wilson, P.S. Bate
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Influence of Strain Path on Forming Limit Strains in Aluminum
Materials Science Forum, 2000The purpose of this research is to reveal the influence of preceding straining on the subsequent deformation behavior in sheet metal forming of aluminum. Three types of two stage strain paths were tested in the present study; (1) uniaxial tensile straining followed by orthogonal uniaxial tensile straining, (2) equibiaxial tensile straining followed by ...
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On the influence of strain-path changes on fracture
Metallurgical Transactions A, 1987Abrupt 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 ...
S. C. Kestner, D. A. Koss
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2011
A non-straight strain path can both raise and lower the formability, depending on the character of the strain path changes. Abrupt changes create a stress overshoot that may cause premature fracture. The transient stress effect on the other hand can create a situation of quasi-hardening that creates additional formability.
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A non-straight strain path can both raise and lower the formability, depending on the character of the strain path changes. Abrupt changes create a stress overshoot that may cause premature fracture. The transient stress effect on the other hand can create a situation of quasi-hardening that creates additional formability.
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On Deformation under Strain Path with a Corner
ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, 1990AbstractCk15 steel tubular specimens were subjected to two straight line strain paths making an angle of 0° to 90° with each other and typical histories of stress and strain are presented. A comparison with the predictions of generalized theory developed by Lehmann [1] in the frame of continuum mechanics and thermodynamics has been made with a view to ...
N. K. Gupta, H.‐A. Lauert, U. Zdebel
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The effects of combined strain-path and strain-rate changes in aluminum
Metallurgical Transactions A, 1993The effect of changes in both the direction of tensile stress and the strain rate upon the plastic behavior and microstructure of aluminum has been investigated. The reduction in strain-hardening rate following a strain-path change was influenced by the strain rate prior to and after the change; higher strain rates in the first stage and lower rates in
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Microstructure and strain path in deep-drawing
Acta Metallurgica, 1977Abstract Dislocation cells in cold rolled mild steel sheets submitted to uniaxial tension and equibiaxial tension have been studied in the transmission electron microscope. Their differences have been taken into account to explain how strain paths influence forming limit diagrams.
François Ronde-Oustau, Bernard Baudelet
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