Fatigue behavior of A356/357 aluminum cast alloys. Part II – Effect of microstructural constituents

Wang, Q.G; Apelian, Diran; Lados, Diana A.

doi:10.1016/s1471-5317(00)00009-2

Cited by 262 publications

(152 citation statements)

References 18 publications

Supporting

Mentioning

138

Contrasting

Unclassified

Order By: Relevance

“…R = À1 or 0.1) [3][4][5][6][7][8][9][10][11][12][13][14]. The porosity, the secondary dendrite arm spacing, the Al-matrix, Si-particles, and Fe-rich intermetallic phases have been experimentally identified as the major factors affecting the alloys resistance to fatigue.…”

Section: Uniaxial Loadsmentioning

confidence: 99%

“…An extensive literature review has highlighted the fact that there exists a large amount of uniaxial fatigue data for this material, for example in rotating bending, plane bending or uniaxial tension-compression loading conditions [3][4][5][6][7][8][9][10][11][12][13][14]. However, this data is often limited to load ratios of either R = À1 or R = 0.1 and very little, if any, data is available for biaxial tensile loads and torsion.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

View full text Add to dashboard Cite

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. b s t r a c tThis article is dedicated to the high cycle fatigue behaviour of cast hypo-eutectic Al-Si alloys. In particular, the AlSi7Cu05Mg03 alloy is investigated. It presents the results of a vast experimental campaign undertaken to investigate the fatigue behaviour, and more specifically the fatigue damage mechanisms observed under complex loading conditions: plane bending with different load ratios, fully reversed torsion and equibiaxial bending with a load ratio of R = 0.1. A specific test set-up has been designed to create an equibiaxial stress state using disk shaped specimens. A tomographic analysis is also presented with the aim of characterising the micro-shrinkage pore population of the material. It is shown that two distinct and coexisting fatigue damage mechanisms occur in this material, depending on the presence of different microstructural heterogeneities (i.e. micro-shrinkage pores, Silicon particles in the eutectic zones, Fe-rich intermetallic phases, etc.). Furthermore, it is concluded that the effect of an equibiaxial tensile stress state is not detrimental in terms of high cycle fatigue. It is also shown that the Dang Van criterion is not able to simultaneously predict the multiaxial effect (i.e. torsion and equibiaxial tension) and the mean stress effect for this material.

show abstract

Section: Uniaxial Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Koutiri

Bellett

Morel

et al. 2013

International Journal of Fatigue

View full text Add to dashboard Cite

show abstract

“…Fracture surfaces of the formed material were also found to be more irregular than the undeformed, which indicates that crack path deflection was more prominent. This latter observation is likely due to eutectic particle refinement as smaller particles have been found to increase fatigue limits in this alloy system [3].…”

Section: Resultsmentioning

confidence: 74%

Fatigue characterization of flowformed A356-T6

Roy

Maijer

Zhao

2014

MATEC Web of Conferences

View full text Add to dashboard Cite

Abstract.Flowforming is an incremental rotary forming technology consisting of deforming a cylindrical workpiece through contact between a roller and a rotating mandrel. This process delivers significant local compressive plastic strain to the workpiece. The effects on fatigue resilience of a common aluminum foundry alloy (A356) processed in this manner at an elevated temperature has been shown to improve post heat treatment. Fatigue properties of material processed with a standard heat treatment following casting is compared to material which has been cast and flowformed to varying degrees and then heat treated. Flowformed material with varying degrees of rotary deformation have been tested. Endurance limits have been found to be generally governed by porosity and maximum principal stress for high cycle fatigue on undeformed material. Fatigue properties have been quantified employing stress-life relationships derived from uniaxial fatigue tests. A 30% increase in the high-cycle endurance limits of flowformed compared to non-deformed material has been observed and is linked to the extent of deformation. Fractographic examination shows that this increase in endurance limit can be attributed primarily to the mitigation of porosity. Microstructural changes due to processing appear to be a secondary factor.

show abstract

“…It has been found that increasing the SDAS decreases the local fatigue limit as shown in fig. 14, because there is a correlation between SDAS and level of porosity [15]. Stress concentrations by pores cause a dramatic reduction of fatigue limit and change of fatigue prediction results [16].…”

Section: Sand and Permanent Mold Aluminum Castingmentioning

confidence: 99%

Regarding Influences of Production Processes on Material Parameters in Fatigue Life Prediction

Aichberger¹,

Riener²,

Dannbauer³

2007

SAE Technical Paper Series

View full text Add to dashboard Cite

Fatigue life prediction has reached a high level in respect to practical handling and accuracy in the last decades. As a result of insecure or lacking input data unacceptable deviations between numerical results and test results in terms of cycles till crack initiation are possible. On the one hand, the accuracy of Finite Element results gets better and better because of greatly increasing computer power and mesh density. Whereas on the other hand, the situation is much more critical regarding load data and especially regarding local material properties of the components (compared to specimen data).But in the last few years also the possibilities of process simulation have improved in such, that at least a few local material properties or quality indicators can be predicted with sufficient reliability. While for instance the detailed simulation of the welding process is still difficult during the common development process, sheet-metal forming and casting simulations are already widely applied to optimize properties of components and manufacturing processes in an early stage of development.Both simulation technologies represent a current state of the art. Therefore it is reasonable to integrate the results of process simulation into fatigue analysis to improve the accuracy of fatigue life prediction. For forming simulation of steel sheet-metal as well as for sand and die casting of aluminum and magnesium this integration has recently been implemented.As an output of forming simulation the effective plastic strain can be used as an indicator for local material changes. Using the distribution of the sheet metal thickness in FEA and fatigue life prediction is already possible because the required interfaces are available.With today's cast simulation tools distributions of local material parameters (e.g. ultimate strength, yielding point) can be predicted. Further the secondary dendrite arm spacing (SDAS), whose distribution is an output from casting simulation, correlates significantly with porosity and endurance limit. For die casting, a pore free surface layer can be accounted for.All those parameters can be used as an input for fatigue analysis and practical examples demonstrate the influence on the predicted results.

show abstract

Fatigue behavior of A356/357 aluminum cast alloys. Part II – Effect of microstructural constituents

Cited by 262 publications

References 18 publications

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

Fatigue characterization of flowformed A356-T6

Regarding Influences of Production Processes on Material Parameters in Fatigue Life Prediction

Contact Info

Product

Resources

About