Ductile damage evolution under triaxial state of stress: theory and experiments

Bonora, Nicola; Gentile, Domenico; Pirondi, A.; Newaz, Golam

doi:10.1016/j.ijplas.2004.06.003

Cited by 273 publications

(131 citation statements)

References 39 publications

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“…By comparing the impact response of an elastic composite sheet with visco-elastic composite sheet, it was shown that the viscoelastic properties of materials improve the ability and resistance of such materials against damages induced by impact loading. The results of this research in conjunction with the similar studies published by Dear and Brown (2003), Bonora et al (2005) and FEM analyses of Lin and Schomburg (2003) suggest that visco-elastic materials are suitable candidate materials as load absorbers in critical industries.…”

Section: Discussionsupporting

confidence: 75%

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Impact damage simulation in elastic and viscoelastic media

Ghoreishi¹,

Pourhosseini²

2013

10.5267/j.esm

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Collide of two objects or impact, is one of the main damage initiation reasons. In this paper, impact and damage behavior of elastic and visco-elastic bodies are investigated numerically using the finite element analyses. The results showed that visco-elastic materials, distribute stresses to the edge of model after the impact with a solid body. Furthermore, the impact of elastic and visco-elastic composite materials are analyzed and the variations of stress, displacement, damage energy and the damage patterns during a time period are compared for the two material models. The reduction in the values of stress, displacement and damage energy of visco-elastic material is also determined relative to the elastic composite material.

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Section: Discussionsupporting

confidence: 75%

“…4 shows the schematic of a simply supported composite sheet subjected to impact loading. This configuration of loading has also been used by Bonora et al (2005) to study the damage process. The composite sheet contains 6 symmetric plies with angle of 90,-90 and 0.…”

Section: Damage Analysis For Elastic and Visco-elastic Composite Matementioning

confidence: 99%

Impact damage simulation in elastic and viscoelastic media

Ghoreishi¹,

Pourhosseini²

2013

10.5267/j.esm

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“…This is evident from Fig. 8, that the coalescence of the cavities, the growth of microvoids for an increasing plastic deformation progressively reduces the material capability to support the mechanical loads up to complete failure [18].…”

Section: Failure Analysis (Fractography)mentioning

confidence: 87%

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

2013

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. Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests. Materials and Design, Elsevier, 2013, vol. 49, pp. 638-646. <10.1016/j.matdes.2013 OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe aim of the presented investigations is to perform an analysis of fracture and instability during simple and complex load testing by addressing the influence of ductile damage evolution in necking processes. In this context, an improved experimental methodology was developed and successfully used to evaluate localization of deformation during uniaxial and biaxial tensile tests. The biaxial tensile tests are carried out using cruciform specimen loaded using a biaxial testing machine. In this experimental investigation, Stereo-Image Correlation technique has is used to produce the heterogeneous deformations map within the specimen surface. Scanning electron microscope is used to evaluate the fracture mechanism and the micro-voids growth. A finite element model of uniaxial and biaxial tensile tests are developed, where a ductile damage model Gurson-Tvergaard-Needleman (GTN) is used to describe material deformation involving damage evolution. Comparison between the experimental and the simulation results show the accuracy of the finite element model to predict the instability phenomenon. The advanced measurement techniques contribute to understand better the ductile fracture mechanism.

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“…Bao and Wierzbicki (2004) carried out 15 tests of aluminum alloy to cover stress triaxiality ranging from -1/3 to 1, including uniaxial tension, notched specimens, specimens with a central hole, simple shear (SS) specimens, tensile tube, and cylindrical bars for upsetting tests. In order to obtain the threshold strain at different stress triaxialities, notched round bar and image processing methodology were used to calibrate the Gurson-Tvergaard-Needleman (GTN) model under multiaxial stress states (Bonora et al, 2005;Li et al, 2011;Yoshida and Ishikawa, 2011). A novel specimen geometry designed by Shouler and Allwood (2010), allowing proportional shear loading paths across the strain ratio (À1 " 2 =" 3 À Á 1=2), can be performed using classical universal tensile machine.…”

Section: Introductionmentioning

confidence: 99%

Identification of fully coupled anisotropic plasticity and damage constitutive equations using a hybrid experimental–numerical methodology with various triaxialities

Yue

Soyarslan

Badreddine

et al. 2014

International Journal of Damage Mechanics

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A hybrid experimental-numerical methodology is presented for the parameter identification of a mixed nonlinear hardening anisotropic plasticity model fully coupled with isotropic ductile damage accounting for microcracks closure effects. In this study, three test materials are chosen: DP1000, CP1200, and AL7020. The experiments involve the tensile tests with smooth and notched specimens and two types of shear tests. The tensile tests with smooth specimens are conducted in different directions with respect to the rolling direction. This helps to determine the plastic anisotropy parameters of the material when the ductile damage is still negligible. Also, in-plane torsion tests with a single loading cycle are used to determine separately the isotropic and kinematic hardening parameters. Finally, tensile tests with notched specimens and Shouler and Allwood shear tests are used for the damage parameters identification. These are conducted until the final fracture with the triaxiality ratio lying between 0 and 1= ffiffi ffi 3 p (i.e. 0 1= ffiffi ffi 3 p ). The classical force-displacement curves are chosen as the experimental responses. However, for the tensile test with notched specimens, the distribution of displacement components is measured using a full field measurement technique (ARAMIS system). These experimental results are directly used by the identification methodology in order to determine the ''best'' values of material parameters involved in the constitutive equations. The inverse identification methodology combines an optimization algorithm which is coded within MATLAB together with the finite element (FE) code ABAQUS/Explicit. After optimization, good agreement between experimental and numerically predicted results in terms of force-displacement curves is obtained for the three studied materials. Finally, the applicability and validity of the determined material parameters are proved with additional validation tests.

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Ductile damage evolution under triaxial state of stress: theory and experiments

Cited by 273 publications

References 39 publications

Impact damage simulation in elastic and viscoelastic media

Impact damage simulation in elastic and viscoelastic media

Failure analysis based on microvoid growth for sheet metal during uniaxial and biaxial tensile tests

Identification of fully coupled anisotropic plasticity and damage constitutive equations using a hybrid experimental–numerical methodology with various triaxialities

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