A Fatigue Model for Discontinuous Particulate-Reinforced Aluminum Alloy Composite: Influence of Microstructure

McCullough, R.R.; Jordon, J.B.; Brammer, A. T.; Manigandan, K.; Srivatsan, T. S.; Allison, P. G.; Rushing, Timothy W.

doi:10.1007/s11665-013-0766-x

Cited by 12 publications

(11 citation statements)

References 40 publications

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“…The last stage, N LC , is the number of cycles required for the advancement of a long crack to ultimate fracture. The MSF model has been modified and extended for a variety of materials and applications since its development [31][32][33][34][35][36][37][38][39][40].…”

Section: Multistage Fatigue Modelmentioning

confidence: 99%

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Cisko

Jordon

Avery

et al. 2019

Metals

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An extensive experimental and computational investigation of the fatigue behavior of friction stir welding (FSW) of aluminum–lithium alloy (AA2099) is presented. In this study, friction stir butt welds were created by joining AA2099 using two different welding parameter sets. After FSW, microstructure characterization was carried out using microhardness testing, scanning electron microscopy, and transmission electron microscopy techniques. In particular, the metastable strengthening precipitates T1 (Al2CuLi) and δ’(Al3Li) seen in the base metal were observed to coarsen and dissolve due to the FSW process. In order to evaluate the static and fatigue behavior of the FSW of the AA2099, monotonic tensile and fully-reversed strain-controlled fatigue testing were performed. Mechanical testing of the FSW specimens found a decrease in the ultimate tensile strength and fatigue life compared to the base metal. While the process parameters had an effect on the monotonic properties, no significant difference was observed in the number of cycles to failure between the FSW parameters explored in this study. Furthermore, post-mortem fractography analysis of the FSW specimens displayed crack deflection, transgranular fracture, and delamination failure features commonly observed in other parent Al–Li alloys. Lastly, a microstructurally-sensitive fatigue model was used to elucidate the influence of the FSW process on fatigue life based on variations in grain size, microhardness, and particle size in the AA2099 FSW.

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Section: Multistage Fatigue Modelmentioning

confidence: 99%

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Cisko

Jordon

Avery

et al. 2019

Metals

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“…The local average maximum plastic shear strain amplitude located around the Si particle can be given by the following formula 25,26 :

\frac{normalΔ ε_{a}^{p}}{2} goodbreak= {[\frac{{((), MPS)}^{2}}{((), NND) ((), GS)}]}^{γ} Y {(ε_{a} - ε_{italicth})}^{q},

where

ε_{a}

is the remote applied strain amplitude and

ε_{th}

is the microplasticity threshold. The parameter Y is used to capture the load ratio effects.…”

Section: Discussionmentioning

confidence: 99%

“…The local average maximum plastic shear strain amplitude located around the Si particle can be given by the following formula 25,26 :…”

Section: The Effect Of Si Particlesmentioning

confidence: 99%

Microstructure characteristics and their effects on fatigue behaviors of the bond zone between Al‐12Si/ABOw composites and Al‐12Si alloys

Tong

Zhang

Cao

et al. 2022

Fatigue Fract Eng Mat Struct

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In order to research the fatigue properties of the bond zone between aluminum borate whiskers (ABOw)-reinforced composites and matrix Al-12Si alloys, specially designed specimens consisted of Al-12Si/ABOw composites and Al-12Si alloys (named C/A specimen for short) were used in fatigue tests at different temperatures. The microstructure evolution of the bond zone of C/A specimen was studied through electronic microscope analysis. The results showed that the aluminum borate whiskers could cause segregation of alloying elements in the Al matrix and formation of numerous microscopic pores. Moreover, whiskers that were perpendicular to the load tended to cause interface between whiskers and Al matrix or Si particles cracking and thus lead to deterioration of fatigue performance. With the change of temperature from 25 C to 350 C, the toughness of Al matrix increased and the strength decreased, which also made the most serious stress concentration site of C/A specimen varied at different temperatures.

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“…The initiation/nucleation life in composite materials is miniscule; however, the short crack growth life is significant. [11][12][13][14][15] The present model provides an insight to investigate the effects of various microstructural descriptors on fatigue life. The novelty of present multistage model is the derivation of complex closed form expression to predict the MSFCG life of DRMMCs on the basis of the nucleation life, and microstructural short fatigue crack growth and long crack growth lives have been carried out in a categorical manner.…”

Section: Discussionmentioning

confidence: 99%

“…Tevatia and Srivastava 35,36 proposed another fatigue crack growth life prediction model on the basis of the modified shear lag theory (model I), 35 including the effect of residual thermal stresses (model II). 36 In the present work, a closed form expression based on the multistage fatigue crack growth (MSFCG) 11,[13][14][15][42][43][44] life is obtained for estimating the total fatigue crack growth life of DRMMCs. It has been reported that FIGURE 1 A, Schematic showing different paths of the crack initiation in discontinuous reinforced metal matrix composites with cyclic plastic zone (CPZ) and fatigue damage zone (FDZ) at the root of the crack initiation.…”

mentioning

confidence: 99%

The energy‐based multistage fatigue crack growth life prediction model for DRMMCs

Tevatia

Srivastava

2018

Fatigue Fract Eng Mat Struct

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A complex closed form expression for the multistage fatigue crack growth life has been developed to predict the fatigue life of discontinuous reinforced metal matrix composites. The multistage fatigue crack growth model includes the microstructural features of composite such as aspect ratio, volume fraction of reinforcement, constraint of fibre in the matrix, and interfacial bonding strength. It characterizes the fatigue damage evolution in various stages of crack nucleation/initiation and the growth of crack culminating in failure. A fatigue crack initiation model is presented, using energy balance equation, considering the nucleation process of phase transformation. The short crack growth life is estimated using the dependency of cyclic crack‐tip opening displacement that is directly correlated with the fatigue crack growth rate whereas the long crack growth life is evaluated using Li and Ellyin model. The sensitivity analysis of crack initiation model is performed to provide in‐depth knowledge on the mechanistic aspect. The sensitivity analysis shows that the little variation in the parameters “cyclic strain hardening exponent” (n′), “cyclic strength coefficient” (K′), and short crack length (asc) significantly affects the total fatigue crack growth life. It is observed that reinforcement increases the cyclic plastic deformation level and cyclic plastic zone size near the crack tip, under the total strain‐controlled conditions. The effect of total fatigue crack growth life is found to be significant in low cycle fatigue applications.

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A Fatigue Model for Discontinuous Particulate-Reinforced Aluminum Alloy Composite: Influence of Microstructure

Cited by 12 publications

References 40 publications

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Experiments and Modeling of Fatigue Behavior of Friction Stir Welded Aluminum Lithium Alloy

Microstructure characteristics and their effects on fatigue behaviors of the bond zone between Al‐12Si/ABOw composites and Al‐12Si alloys

The energy‐based multistage fatigue crack growth life prediction model for DRMMCs

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