Effects of constituent particle clusters on fatigue behavior of 2024-T3 aluminum alloy

DeBartolo, Elizabeth; Hillberry, B. M.

doi:10.1016/s0142-1123(98)00041-3

Cited by 39 publications

(23 citation statements)

References 11 publications

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“…Even if detailed LEFM solutions are used for local crack geometries forming at lower scale inclusions and growing away from them (cf. [5,18,33]), the ductile nature of the matrix material calls into question the validity of LEFM since even in the HCF regime the local cyclic plastic strain at notches is often substantial. In fact, this point likely renders an overly detailed analysis of stress intensity factors for cracks growing from Si particles or moderate size gas-driven or shrinkage-driven pores more of an academic than practical exercise; even if interaction effects of the crack with other adjacent inclusions are considered, LEFM is based on linear elastic solutions that invoke the small scale yielding assumption.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

334

207

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High cycle fatigue (HCF) life in cast Al-Mg-Si alloys is particularly sensitive to the combination of microstructural inclusions and stress concentrations. Inclusions can range from large-scale shrinkage porosity with a tortuous surface profile to entrapped oxides introduced during the pour. When shrinkage porosity is controlled, the relevant microstructural initiation sites are often the larger Si particles within eutectic regions. In this paper, a HCF model is introduced which recognizes multiple inclusion severity scales for crack formation. The model addresses the role of constrained microplasticity around debonded particles or shrinkage pores in forming and growing microstructurally small fatigue cracks and is based on the cyclic crack tip displacement rather than linear elastic fracture mechanics stress intensity factor. Conditions for transitioning to long crack fatigue crack growth behavior are introduced. The model is applied to a cast A356-T6 Al alloy over a range of inclusion severities.

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Section: Introductionmentioning

confidence: 99%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

334

207

View full text Add to dashboard Cite

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“…These latter cases correspond to the widely met and examined reinforced-matrix structures [DeBartolo and Hillberry 1998;Estevez et al 1999;Martin et al 2003;Ricotti et al 2006]. Conversely, perfect phase cocontinuity symmetry even for only two phases is only realizable in a very limited set of manners which are not isotropic [Burt and Korren 1996].…”

Section: Typical Cocontinuous Two-phase Structures and Phase Continuimentioning

confidence: 68%

Effective property estimates for heterogeneous materials with cocontinuous phases

Franciosi

Brenner

Omri

2011

J. Mech. Mater. Struct.

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This work concerns heterogeneous multiphase materials which may exhibit omnidirectional full or partial cocontinuity of several or all phases. The estimate of their effective (mechanical or physical) properties is not yet well handled as compared to those for well-defined aggregate or reinforced-matrix structures, especially in the context of homogenization methods. We propose in this framework a modeling scheme which aims at accounting for such phase cocontinuity features. In the mechanical application field, the modeling validity restricts to elastic properties of unloaded materials or in load situations as far as bending and torsion effects of possibly strut-like phase parts are not essential. For other physical properties (dielectric, magnetic, etc.), the modeling applications concern those for which homogenization approaches are relevant. The modeling is based on a material's morphology description in terms of a generalization of so-called "fiber systems" that were introduced in early literature reports. Using parameters that describe the clustering characteristics of the individual phases and of their assemblage, we have considered these fiber systems both within a layer-based approach of the material structure and within an aggregate-like one. By these two routes, we have obtained two estimate forms that differ only slightly in definition. The presentation uses the elasticity formalism, in simple cases of isotropic mixtures of two-phase materials with isotropic phase behavior but the modeling extends to n-phase anisotropic materials as established separately. Our estimates are compared with basic variational bounds and homogenization estimates, with some literature data and with homogenization results obtained with the fast Fourier transform approach on numerical structures. All data are matched with different parameter sets corresponding to different types of phase organization. The two estimates remain nearly equal for all of the examined structures regardless of phase contrast and with only slight differences consistent with their definition difference.

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“…Compared with the crack size, the inelastic region of the crack tip is very small, so linear elastic fracture mechanics (LEFM) can be applied to solve the fatigue problem. Rice proposed that the issue of three dimensional surface crack can be simplified to the plate and shell structure with line spring model.The line spring model is a simple and effective method to solve the problem of co-plane multiple cracks [3,14,15].…”

Section: The Line Spring Model Of Multi Coplanar Cracksmentioning

confidence: 99%

Research on coalescence and probabilistic failure physics modeling of coplanar semiellipse cracks

Sun

et al. 2018

MATEC Web Conf.

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Abstract. Multiple fatigue cracks, causing transient fatigue fracture and resulting in great loss of life and property, are very commen in engineering structures. In order to predict the fatigue life of engineering alloys more accurately, the interaction and coalescence of adjacent cracks was investigated and the four stages of cracks growth were discussed in this paper. The SIF(stress intensity factor) value was found to growth rapidly in the ligament failure, and simulation method was used to find out the coalescence point. Then, the Paris' law was chosen to discribe the crack growth process. Taking random factors like structure size, material properties, environment stress parameter into account, the probability physical of failure model of alloys can predict the failure life more accurate. Accordingly, the uncertain parameters of the Paris' law were updated via Bayesian update method. The posterior distributions of uncertain parameters were obtained by the MCMC-Gibbs sampling. Finally, the probabilistic failure life models before and after coalescence were established by Monte Carlo simulation method. The probabilistic modeling method, which can greatly reduces the historical data or experimental data needed for the reliability evaluation of small sample products, can also be applied to other aspect of physic of failure , effectively saving time and cost. IntroducitionFatigue failures, which occures at stress below the tensile strength or yield strength of alloys is hard to be detected. Since most engineering components are or similarly are subjected to alternating stress. Multiple fatigue cracks causing transient fatigue fracture and resulting in great loss of life and property, are very commen in engineering structures. Crack mainly initiats in localized areas of stress concentratin or material defects [1,2]. Then these initial cracks grow together by interacting with each other, meanwhile shortening the fatigue life with an accelerated crack growth rate [3]. Interaction and coalescence processes of adjacent cracks is the key issue in the study of coplanar fatigue cracks.Various theories have been propounded to assess the growth of adjacent surface cracks growth. The British Standard Institution[4] proposed a prediction method assuming cracks to be indepentend. However this idealize simple model mainly considering the geometric condition of cracks, turned out to be too conservative [5]. Iida [6] assumed that when the cracks touch, a semi-elliptical crack immediately drawn through the outer tips of the two adjucent cracks and through the deepest point of the deeper crack. The study neglected the interaction in calculation between adjucent cracks(the interaction factors γA to F =1) and proposed a simple realistic prediction method. However the a Corresponding

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Effects of constituent particle clusters on fatigue behavior of 2024-T3 aluminum alloy

Cited by 39 publications

References 11 publications

Microstructure-based fatigue modeling of cast A356-T6 alloy

Microstructure-based fatigue modeling of cast A356-T6 alloy

Effective property estimates for heterogeneous materials with cocontinuous phases

Research on coalescence and probabilistic failure physics modeling of coplanar semiellipse cracks

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