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Title: A unified model for metal failure capturing shear banding and fracture

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
International Journal of Plasticity
Additional Journal Information:
Journal Volume: 65; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-14 19:43:40; Journal ID: ISSN 0749-6419
Country of Publication:
United States

Citation Formats

McAuliffe, Colin, and Waisman, Haim. A unified model for metal failure capturing shear banding and fracture. United States: N. p., 2015. Web. doi:10.1016/j.ijplas.2014.08.016.
McAuliffe, Colin, & Waisman, Haim. A unified model for metal failure capturing shear banding and fracture. United States. doi:10.1016/j.ijplas.2014.08.016.
McAuliffe, Colin, and Waisman, Haim. 2015. "A unified model for metal failure capturing shear banding and fracture". United States. doi:10.1016/j.ijplas.2014.08.016.
title = {A unified model for metal failure capturing shear banding and fracture},
author = {McAuliffe, Colin and Waisman, Haim},
abstractNote = {},
doi = {10.1016/j.ijplas.2014.08.016},
journal = {International Journal of Plasticity},
number = C,
volume = 65,
place = {United States},
year = 2015,
month = 2

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ijplas.2014.08.016

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Cited by: 16works
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Web of Science

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  • The Brazilian disk specimen is used to measure the fracture toughness of an epoxy resin material under mode-I and mode-II loading conditions. It is found that even though the apparent fracture behavior seems to be brittle for both loading modes, the mode-II fracture toughness is more than three times higher than the mode-I fracture toughness. Such a substantial increase in fracture toughness is more than three times higher than the mode-I fracture toughness. Such a substantial increase in fracture toughness under mode-II loading contradicts the prediction of the maximum hoop stress criterion, which has been validated for most brittle fractures.more » Results of unidirectional tension and compression tests of the epoxy resin indicate that under the mode-II loading, shear banding can develop ahead of the crack tip before the brittle fracture occurs. The substantial increase of the mode-II fracture toughness can be accounted for by including the contributions of the shear banding. A mechanical model was developed to study the effects of the shear band on the mode-II fracture toughness. This model suggests that the extension direction of a mode-II crack is still controlled by the orientation of the maximum hoop stress; however, the critical energy-release rate should include contributions from both the maximum hoop stress and the shear band. The effect of different stress distribution profiles inside the shear band is studied with the model as well.« less
  • The instability of biaxial stretching leading to the development of shear bands in viscoplastic materials with both isotropic hardening and kinematic hardening is examined. The main issues are to evaluate the effect of anisotropy and inertia on the onset of instability and to examine the development and evolution of an inhomogeneous deformation structure, using both a linear analysis and a nonlinear finite element analysis. It is shown that the back stress and plastic spin, modeling deformation induced anisotropy and texture development, have a significant influence on the critical state at which the first instability occurs. The corotational rate of themore » back stress and its relation to the spin of the substructure produces apparent softening, causing instability at positive strain hardening (in the absence of back stress and corotational rates instability occurs at zero hardening). When decreasing the magnitude of the spin of the substructure by varying the plastic spin parameter the critical value of the hardening parameter decreases towards zero, illustrating again the softening effect of the spin. It is also shown that at the onset of instability, the linear analysis predicts the development of a periodic structure of square cells, implying that although the deformation has become inhomogeneous it is far from being localized. The nonlinear finite element analysis also predicts the formation of a square cell pattern at the onset of instability. This pattern however evolves into localized shear bands far into the post localization regime as shown by the nonlinear analysis. 34 refs., 9 figs.« less
  • Several plasticity phenomena display a size effect where the smaller the size is the stronger its response. This effect relates to the plastic gradients, appearing in plastically inhomogeneous material. The present paper describes results of an experimental meso-scale study using the specimens having rectangular cross section made of FCC polycrystal of pure Aluminum and OFHC Copper under the tensile or compressive loading. Experimental measurements are carried out to investigate thickness effect and grain size effect in connection with size effect, and the internal mechanism of plastic flow in the specimens is also discussed.
  • The present study is concerned with a correlation between dynamic deformation properties obtained from the dynamic Kolsky bar test with the adiabatic shear banding behavior developed in Al-Li alloys upon ballistic impact, and then with the ballistic performance. The selected materials were a 2090 Al-Li alloy, a WELDALITE 049 alloy, and a 7039 Al alloy, to allow a comparative study of different strengths and microstructures. After the ballistic impact testing, the amount and the distribution of adiabatic shear bands were examined using optical and scanning electron microscopes. In the front side of the impacted area, many thin delaminated sheets andmore » a large amount of fragmentation were observed in the 2090 alloy and the WELDALITE alloy, respectively. Near the impacted region, a large amount of plastic flow also existed, and adiabatic shear bands were hardly observed in the 2090 and the WELDALITE alloys, whereas they easily formed in the 7039 alloy. Since adiabatic shear bands usually deteriorate the impact resistance of target materials, the ballistic performance of each alloy was discussed by comparing the adiabatic shear banding behavior with microstructure, strength level, and dynamic torsional properties.« less
  • Severe plastic deformation is observed within adiabatic shear bands in iron-carbon steels. These shear bands form under high strain rate conditions, in excess of 1000 s{sup -1}, and strains in the order 5 or greater are commonly observed. Studies on shear band formation in a ultrahigh carbon steel (1.3%C) are described in the pearlitic condition. A hardness of 11.5 GPa (4600 MPa) is obtained within the band. A mechanism is described to explain the high strength based on phase transformation to austenite from adiabatic heating resulting from severe deformation. Rapid re-transformation leads to an ultra-fine ferrite grain size containing carbonmore » principally in the form of nanosize carbides. It is proposed that the same mechanism explains the ultrahigh strength of iron-carbon steels observed in ball-milling, ball drop tests and in severely deformed wires.« less