Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Fan, Jinghong; Horstemeyer, M.F.; Gall, Ken

doi:10.1016/s0013-7944(02)00097-8

Cited by 141 publications

(101 citation statements)

References 17 publications

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“…This was the case for the gravity sand cast material investigated by Koutiri et al [12,13] for which it was found that the final failure was typically caused by fatigue cracks that originated from large micro-shrinkage pores. Conversely, for a very similar material treated by the HIP post-casting process, so that micro-shrinkage porosity is dramatically reduced, the fatigue strength is controlled by the first fatigue damage mechanism [32] (see Figure 11). …”

Section: Cast Aluminium Alloysmentioning

confidence: 99%

A mechanistic approach to the Kitagawa–Takahashi diagram using a multiaxial probabilistic framework

Pessard

Bellett

Morel

et al. 2013

Engineering Fracture Mechanics

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. AbstractThe aim of this paper is to propose a flexible multiaxial modelling framework that is capable of combining two fatigue damage mechanisms so as to continuously describe the KitagawaTakahashi diagram. It is proposed that this diagram represents two distinct fatigue damage mechanisms: one associated with crack initiation (or microstructurally small cracks) and the other with crack propagation (or long cracks). It is further postulated that these damage mechanisms are more appropriately modelled using different fatigue criteria. A probabilistic modelling framework is proposed in which any two suitable fatigue criteria can be combined in order to simultaneously model both damage mechanisms and the transition between them. This framework is based on the weakest link hypothesis and results in a probabilistic Kitagawa-Takahashi type diagram.

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Section: Cast Aluminium Alloysmentioning

confidence: 99%

A mechanistic approach to the Kitagawa–Takahashi diagram using a multiaxial probabilistic framework

Pessard

Bellett

Morel

et al. 2013

Engineering Fracture Mechanics

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“…Much research has been reported in the scientific literature concerning the fatigue behaviour of cast aluminium-silicon alloys [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17] and [18]. This body of work is generally related to uniaxial loads at low R-ratios (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…silicon particles in the eutectic zones, intermetallic phases or oxides) [6], [4] and [5]. The concept of elastic shakedown at the mesoscopic scale is then sometimes used to evaluate the fatigue life, as per certain multiaxial fatigue criteria like the Dang Van[1], [19] and [20], Papadopoulos [21] or the Huyen and…”

Section: Introductionmentioning

confidence: 99%

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. shown that two different coexisting fatigue damage mechanisms occur in this materials, depending on the presence of different microstructural heterogeneities (i.e. micro-shrinkage pores, Si particles, Ferich intermetallic phases, DAS of the Al-matrix, etc.). In order to take into account both of these damage mechanisms, a probabilistic approach using the weakest link concept is introduced to model the competition between the two mechanisms. This approach leads naturally to a probabilistic Kitagawa type diagram, which explains the relationship between the fatigue behaviour of the material and the different casting processes or post-treatments (e.g. gravity casting and HIP).It is shown that the sensitivity to the different loading modes (i.e. uniaxial with and without mean stress, torsion and equibiaxial tension) depends on the microstructural heterogeneities responsible for crack initiation. For a porosity-free alloy, the predictions are very good for combined tension-torsion loading modes. When pores are present and control the fatigue strength, the predictions are very satisfactory for the uniaxial loads with different R-ratios and slightly conservative for multiaxial loads (i.e. torsion and equibiaxial tension). Never-the-less, they are much better than the predictions of theHighlights ► High cycle fatigue modelling of AlSi7Cu05Mg03 for complex loading conditions. ► Modelling of two coexisting fatigue damage mechanisms. ► A probabilistic approach is proposed to model the competition between these mechanisms. ► The approach leads naturally to a probabilistic Kitagawa type diagram.

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“…The shear friction driving model was used for the friction between the contact surfaces of the billet and the die. All of the initial parameters in numerical simulation are shown in Table 1 [9][10][11][12].…”

Section: Numerical Simulation Of Continuous Extrusion and Rollingmentioning

confidence: 99%

Continuous extrusion and rolling forming of copper strips

et al. 2016

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-Continuous extrusion and rolling technology was proposed as a new strip production technology. It conducts a hot rolling process using waste heat after continuous extrusion. The continuous extrusion and rolling forming was simulated with DEFORM-3D T . Influences of extrusion wheel velocity and rolling reduction on the continuous extrusion and rolling forming were analyzed. It was shown that as extrusion wheel velocity increases, torque of extrusion wheel, chamber force and rolling force, will drop; temperature of the billet in the area of abutment which is highest will increase. As the rolling reduction is increased, torque of the extrusion wheel and force acting on the chamber decrease, while torque and force of the rolls increase. The experimental results showed that a homogeneously distributed and equiaxed grains microstructure can be formed in copper strip billets with an average grain size of about 80 lm, after continuous extrusion. Grains of the copper strips are stretched clearly, during rolling, along the rolling direction, to form a stable orientation. Nevertheless, the grain boundaries are still relatively clear to see.

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Cyclic plasticity at pores and inclusions in cast Al–Si alloys

Cited by 141 publications

References 17 publications

A mechanistic approach to the Kitagawa–Takahashi diagram using a multiaxial probabilistic framework

A mechanistic approach to the Kitagawa–Takahashi diagram using a multiaxial probabilistic framework

A probabilistic model for the high cycle fatigue behaviour of cast aluminium alloys subject to complex loads

Continuous extrusion and rolling forming of copper strips

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