Fracture mechanism maps in stress space

Teirlinck, D.; Zok, Frank W.; Embury, J.D.; Ashby, Michael F.

doi:10.1016/0001-6160(88)90274-x

Cited by 109 publications

(44 citation statements)

References 19 publications

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“…Different weighting functions f yield several well-known fracture models, e.g Teirlinck et al (1988), the ductile fracture is caused by certain combinations of the strain and stress states rather then either of these states separately. The plastic work prior to fracture has been argued to be an important factor.…”

Section: Ductile Fracturementioning

confidence: 99%

“…Several different phenomena may contribute to the failure process. In Teirlinck et al (1988) four failure phenomena observed in uniaxial tension specimens are described: (1) plastic failure, (2) ductile fracture, (3) shear fracture and (4) cleavage and brittle intergranular fracture. It should be noted that failure type (4), cleavage and brittle intergranular fracture, is considered as a brittle fracture, which is not covered here.…”

Section: Introductionmentioning

confidence: 99%

“…The first three failure types presented by Teirlinck et al (1988) are also identified for sheet metals in Hooputra et al (2004), but the term plastic failure is generalised to represent any sheet instability. Prediction of sheet instability due to localisation was studied early in analytical models by Hill (1952) and Swift (1952).…”

Section: Introductionmentioning

confidence: 99%

“…Continued shear increases the area of the voids until separation occurs. Furthermore, as stated by Teirlinck et al (1988) "Voids which extend in shear need not increase in volume, so shear fracture is less pressure-dependent than ductile fracture, though it remains more pressuredependent than purely-plastic failure". Models for predicting shear fracture in sheet metals are presented, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Failure of high strength steel sheets: Experiments and modelling

Björklund

Larsson

Nilsson

2013

Journal of Materials Processing Technology

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Failure in sheet metal structures of ductile material is usually caused by one of, or a combination of, ductile fracture, shear fracture or localised instability. In this paper the failure of the high strength steel Docol 600DP and the ultra high strength steel Docol 1200M is explored. The constitutive model used in this study includes plastic anisotropy and mixed isotropic-kinematic hardening. For modelling of the ductile and shear fracture the models presented by Cockroft-Latham and Bressan-Williams have been used. The instability phenomenon is described by the constitutive law and the finite element (FE) models. For calibration of the failure models and validation of the results, an extensive experimental series has been conducted including shear tests, plane strain tests and Nakajima tests. The geometries of the Nakajima tests have been chosen so that the first quadrant of the forming limit diagram (FLD) were covered. The results are presented both in an FLD and using prediction of force-displacement response of the Nakajima test employing element erosion during the FE simulations. The classical approach for failure prediction is to compare the principal plastic strains obtained from FE simulations with experimental determined forming limit curves (FLC). It is well known that the experimental FLC requires proportional strains to be useful. In this work failure criteria, both of the instability and fracture, are proposed which can be used also for non-proportional strain paths.

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Section: Ductile Fracturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Failure of high strength steel sheets: Experiments and modelling

Björklund

Larsson

Nilsson

2013

Journal of Materials Processing Technology

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“…The variety of fracture mechanisms for aluminium alloys have been investigated for more than thirty years, and fracture maps were presented by Teirlinck et al (1988). Hahn and Rosenfield (1975) pointed out that two populations of particles of different magnitude are involved in the fracture process at different levels.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic failure modes of high-strength aluminium alloy under various stress states

Fourmeau

Børvik

Benallal

et al. 2013

International Journal of Plasticity

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The influence of stress state and plastic anisotropy on the fracture behaviour of a rolled AA7075-T651 aluminium plate under quasi-static loading conditions is studied both experimentally and numerically. Material tests in different directions of the plate were carried out using specimens with various shapes to provide a wide range of stress states. The strain to failure and the failure modes were found to vary strongly with the stress state, but also with the loading direction due to the complex microstructure of the alloy. Finite element simulations adopting an anisotropic plasticity model were used to obtain local values of stresses and strains and to define the strains at fracture for the various stress states. The numerical simulations show that due to the heterogeneous stress and strain fields in the specimens, it is very difficult to accurately locate the point where fracture initiates and thus to determine the local fracture strain as a function of stress state and loading direction.

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Damage and Fracture of Perforated Aluminum Alloys

Öchsner¹,

Winter

Kühn

2000

Adv. Eng. Mater.

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Phase and pore phenomena substantially influence the macroscopic flow of an alloy and the formation of macroscopic cracks. Experimental investigations on aluminum alloys show that pores can develop during plastic deformation, depending on the microstructure. Here perforated Al‐alloys were used to develop a model of micropores in Al‐alloys, and so to have a physical basis for understanding their behavior during ductile fracture.

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Fracture mechanism maps in stress space

Cited by 109 publications

References 19 publications

Failure of high strength steel sheets: Experiments and modelling

Failure of high strength steel sheets: Experiments and modelling

Anisotropic failure modes of high-strength aluminium alloy under various stress states

Damage and Fracture of Perforated Aluminum Alloys

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