Determination of the high strain rate fracture properties of ductile materials using a combined experimental/numerical approach

Barton, D.C.

doi:10.1016/j.ijimpeng.2004.01.006

Cited by 18 publications

(18 citation statements)

References 14 publications

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“…Tables 4 and 5 present the results of tests for the specimens with notches in different shapes as well as the averaged values of the four specimens: the maximum displacement u c and critical force F c . Figures 6,7,8,9,10,11,12 and 13 show the dependence of the tensile force F and extensometer displacement u for constant radius r K , while Figs. 14, 15 and 16 present the above dependence for the constant diameter at the root of the notch K .…”

Section: Fracture Tests Of the Notched Specimensmentioning

confidence: 99%

“…Enami [1] studied the influence of initial strain (caused by compression) on the ductile fracture of a material using two types of steel specimens: cylindrical with radius notches with four round notch radii and flat specimens. Barton [8] used cylindrical specimens with four round notch radii made from Ti6Vn4 titanium alloy to describe the process of ductile fracture depending on the rate of strain. Bao [9] used three types of specimens for analysis of ductile fracture in conditions of triaxial state of stress caused by tension: cylindrical specimens with notches (two round notch radii), flat ones and flat-grooved ones, made from EN-AW 2024 T351 aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Research into Fracture of EN-AW 2024 and EW-AW 2007 Aluminum Alloy Specimens with Notches Subjected to Tension

Derpeński

Seweryn

2010

Exp Mech

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The paper presents the results of experimental tests of elasto-plastic fracture of axially symmetric specimens with circumferential notches with various round notch radii at the notch's root. The tests were conducted for two materials: EN-AW 2024 and EN-AW 2007 aluminum alloys. The specimens were subjected to monotonic uniaxial tensile test. Special attention was paid to the shape of the fracture surface, the change of critical force value and the maximum displacement, depending on the shape of the notch. Additionally, hardening curves are presented for the adopted materials and the results of Finite Element calculations of stress and strain fields in the specimens with different notch radii.

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Section: Fracture Tests Of the Notched Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Research into Fracture of EN-AW 2024 and EW-AW 2007 Aluminum Alloy Specimens with Notches Subjected to Tension

Derpeński

Seweryn

2010

Exp Mech

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“…All quasi-static fracture tests were conducted on a computer controlled servo-hydraulic Dartec universal testing machine whereas a dynamic tensile testing machine known as the "flying wedge" (Barton, 2004) was used for all tests at elevated strain rates. This machine is capable of imparting simultaneous symmetrical loading at both ends of a tensile specimen over a wide range of loading speeds.…”

Section: Testing Equipmentmentioning

confidence: 99%

“…Facilities exist both to heat and cool the specimen before testing. Thus the flying wedge is capable of testing specimens over a wide range of strain rates (10 2 − 10 4 s −1 ) and temperatures (−196 − 600 o C) (Barton, 2004).…”

Section: Testing Equipmentmentioning

confidence: 99%

Anisotropic ductile failure in free machining steel at quasi-static and high strain rates

et al. 2005

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Leaded Free Machining Steel (FMS) specimens were tested in tension at quasi-static and high strain rates in both the longitudinal and transverse directions with respect to the axis of the bar material. For the quasi-static tests, a high degree of anisotropy of fracture behaviour was observed for both plain (unnotched) and notched specimens. However the difference in fracture strains for longitudinal and transverse directions was significantly reduced for the high stress triaxiality conditions produced by the sharper notches. Plain specimens tested at dynamic strain rates (10 3 s −1 ) failed at somewhat higher strains than those tested quasi-statically. For the notched specimens tested dynamically, there was a transition to a brittle mode of failure and there was no statistically significant anisotropy in the very low strains to failure recorded. These experimental results were linked to numerical predictions of the local stress, strain and strain rate conditions in the specimens carried out using a modified Armstrong-Zerilli constitutive model for the FMS. Changes in the percentage area and aspect ratio of the lead inclusions which act as sites for void growth under ductile failure conditions were measured for both longitudinal and transverse directions of loading. It was found that the apparent area of inclusions increases with degree of deformation due to void growth but that the aspect ratio decreases due to the inclusions/voids becoming more spherical. This effect was greater for loading in the transverse direction indicating that voids grow more readily from inclusions when the latter are aligned perpendicular to the direction of loading.

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“…The application field of CDM theory is very extensive: the theory has been used to describe fatigue [25], creep [27], biomechanical problems [28], brittle or ductile fracture [29][30][31][32][33][34][35] or fracture related to impact [36] problems. In this paper, we focus on ductile damage for which there are a lot of damage models (a more detailed bibliographical study of macroscopic ductile damage models can be found in Jeunechamps [37]): let us cite for example Lemaitre's model [21,[38][39][40][41], Goldthorpe's model [42][43][44], Geers' model [45-50], Cochran and Banner's model [51-53], Bonora's model [54, 55], Johnson-Cook's model [56-58] modified by Borvik and Langseth [36, 59-62] and Longere's [63, 64], Omerspahic's [65] and Zhu's [66] anisotropic models.In such a context, the choice of a generic damage formulation is by no means trivial. From a theoretical point of view, following Besson [1], it is clear that phenomenological models do not represent plastic volume variation and consequently void growth.…”

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confidence: 99%

An efficient 3D implicit approach for the thermomechanical simulation of elastic–viscoplastic materials submitted to high strain rate and damage

Jeunechamps

Ponthot

2013

Numerical Meth Engineering

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SUMMARYThis paper aims at presenting a general consistent numerical formulation able to take into account, in a coupled way, strain rate, thermal and damage effects on the behavior of materials submitted to quasistatic or dynamic loading conditions in a large deformation context. The main features of this algorithmic treatment are as follows: A unified treatment for the analysis and implicit time integration of thermo‐elasto‐viscoplastic constitutive equations including damage that depends on the strain rate for dynamic loading conditions. This formalism enables us to use dynamic thermomechanically coupled damage laws in an implicit framework. An implicit framework developed for time integration of the equations of motion. An efficient staggered solution procedure has been elaborated and implemented so that the inertia and heat conduction effects can be properly treated. An operator split‐based implementation, accompanied by a unified method to analytically evaluate the consistent tangent operator for the (implicit) coupled damage–thermo‐elasto‐viscoplastic problem. The possibility to couple any hardening law, including rate‐dependent models, with any damage model that fits into the present framework.All the developments have been considered in the framework of an implicit finite element code adapted to large strain problems. The numerical model will be illustrated by several applications issued from the impact and metal‐forming domains. All these physical phenomena have been included into an oriented object finite element code (implemented at LTAS‐MN 2L, University of Liège, Belgium) named Metafor.Copyright © 2013 John Wiley & Sons, Ltd.

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Determination of the high strain rate fracture properties of ductile materials using a combined experimental/numerical approach

Cited by 18 publications

References 14 publications

Experimental Research into Fracture of EN-AW 2024 and EW-AW 2007 Aluminum Alloy Specimens with Notches Subjected to Tension

Experimental Research into Fracture of EN-AW 2024 and EW-AW 2007 Aluminum Alloy Specimens with Notches Subjected to Tension

Anisotropic ductile failure in free machining steel at quasi-static and high strain rates

An efficient 3D implicit approach for the thermomechanical simulation of elastic–viscoplastic materials submitted to high strain rate and damage

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