Increased Fatigue Strength of Powder Forged Connecting Rods by Optimised Shot Peening

Chernenkoff, Russell A.; Mocarski, S.; Yeager, David A.

doi:10.1179/pom.1995.38.3.196

Cited by 12 publications

(4 citation statements)

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“…However, with the increases in Almen intensity (>0.10 mmN), more severe defects such as overlaps and microcracks occur, and the life improvement dramatically decreases; that is, ZK60 magnesium alloy shows a marked overpeening effect. Similar overpeening effects have also been observed in various materials by other researchers [7,8,26,27]. In addition, the fatigue performance improvement of the ZK60-T5 alloy by SP is slightly superior to that of the ZK60 alloy; the mechanism is as follows: (a) the β (MgZn) phase in the ZK60-T5 alloy is beneficial to the dislocation tangle and dislocation accumulation during SP, compared to the ZK60 alloy.…”

Section: Discussionsupporting

confidence: 77%

Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

Dong

Liu

Ding

et al. 2011

Journal of Metallurgy

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The current work investigated the effect of shot peening (SP) on high cycle fatigue (HCF) behavior of the hot-extruded ZK60 magnesium alloy. SP can significantly improve the fatigue life of the ZK60 alloy. After SP at the optimum Almen intensities, the fatigue strength at 10 7 cycles in the as-extruded (referred to as ZK60) and the T5 aging-treated (referred to as ZK60-T5) alloys increased from 140 and 150 MPa to 180 and 195 MPa, respectively. SP led to a subsurface fatigue crack nucleation in both ZK60 and ZK60-T5 alloys. The mechanism by which the compressive residual stress induced by shot peening results in the improvement of fatigue performance for ZK60 and ZK60-T5 alloys was discussed.

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Section: Discussionsupporting

confidence: 77%

Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

Dong

Liu

Ding

et al. 2011

Journal of Metallurgy

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“…Shot peening process usually decreases the tensile strength and increases the endurance limit. The effect of shot peening on PM material used for connecting rod is described by Chernenkoff et al (1995). Comparisons of shot peened and unpeened connecting rod fatigue strengths showed a 27% fatigue strength improvement.…”

Section: Literature Reviewmentioning

confidence: 99%

A Comparative Study of Fatigue Behavior and Life Predictions of Forged Steel and PM Connecting Rods

Afzal¹,

Fatemi²

2004

SAE Technical Paper Series

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This study investigates and compares fatigue behavior of forged steel and powder metal connecting rods. The experiments included strain-controlled specimen testing, with specimens obtained from the connecting rods, as well as load-controlled connecting rod bench testing. Monotonic and cyclic deformation behaviors, as well as strain-controlled fatigue properties of the two materials are evaluated and compared. Experimental S-N curves of the two connecting rods from the bench tests obtained under R =-1.25 constant amplitude loading conditions are also evaluated and compared. Fatigue properties obtained from specimen testing are then used in life predictions of the connecting rods, using the S-N approach. The predicted lives are compared with bench test results and include the effects of stress concentration, surface finish, and mean stress. The stress concentration factors were obtained from FEA, and the modified Goodman equation was used to account for the mean stress effect. Fractography of the connecting fracture surfaces were also conducted to investigate the failure mechanisms. A discussion of manufacturing cost comparison and recent developments in "crackable" forged steel connecting rods are also included.

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“…Similar overpeening effects have also been observed in other materials by other researchers. 7,8,[29][30][31] …”

Section: Fractographymentioning

confidence: 99%

Effect of Shot Peening on Surface Characteristics and Fatigue Properties of T5-Treated ZK60 Alloy

et al. 2009

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The effects of shot peening on surface characteristics and high cycle fatigue (HCF) performance of T5-treated high-strength magnesium alloy ZK60 (named after ZK60-T5) were investigated. The glass bead with an average diameter of 0.35 mm was adopted for shot peening and the Almen intensity was arranged from 0.02 to 0.40 mmN. The surface microstructure and texture of ZK60-T5 are greatly changed by shot peening, and residual compressive stress is produced in the surface deformation layer. The magnesium alloy ZK60-T5 shows a pronounced overpeening effect. A marked improvement in fatigue life is obtained at low Almen intensities, namely the fatigue strength (at 10 7 cycles) increases from 150 to 195 MPa at the optimum Almen intensity of 0.05 mmN. The fatigue crack nucleation site of ZK60-T5 is also found from surface regions to the subsurface.

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Increased Fatigue Strength of Powder Forged Connecting Rods by Optimised Shot Peening

Cited by 12 publications

References 1 publication

Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

Surface Characteristics and High Cycle Fatigue Performance of Shot Peened Magnesium Alloy ZK60

A Comparative Study of Fatigue Behavior and Life Predictions of Forged Steel and PM Connecting Rods

Effect of Shot Peening on Surface Characteristics and Fatigue Properties of T5-Treated ZK60 Alloy

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