Notch Behavior and Fatigue Life Predictions of Discontinuously Reinforced MMCs

Uygur, İlyas

doi:10.2478/v10172-011-0012-1

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…This is due to the fact that the holes created by the 90°drill bit are much sharper with the root radius of 0.585 mm compared to the ones created by the 150°drill bit with the radius of 0.895 mm. The reduction in the root radius increases the stress concentration factor that dramatically reduces the fatigue life [46]. Furthermore, the transition from elastic to plastic state of the material is significantly affected by the root radius size of a defect [47].…”

Section: Residual Stressmentioning

confidence: 99%

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Saklakoğlu

Bolouri

İrizalp

et al. 2021

Int J Adv Manuf Technol

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Shot peening processes are commonly used for improving the fatigue properties of steels. Shot peening introduces a compressive residual stress field in the near surface of steel, which can reduce or stop the growth of fatigue cracks and improve fatigue properties. This study experimentally investigated the effect of shot peening on the fatigue properties of 50CrV4 steel alloys with different artificial surface defects. Drilling tools were used to introduce different artificial defects with root radii of 0.585 mm and 0.895 mm on the surface of unpeened samples. The shot peening was applied to the drilled and undrilled samples. Scanning electron microscopy (SEM) observations, micro-hardness and X-ray diffraction residual stress measurements were conducted to analyse the characteristics of the shot-peened and unpeened samples. The results show that the shot peening leads to the transformation of the retained austenite to martensite in the near-surface microstructure. The hardness rates of the surface and near surface both increase by 8% after the shot peening. The peened samples exhibit compressive residual stresses with a high degree of isotropy in the near surface. The fatigue properties of samples were experimentally evaluated by conducting 3-point bending tests. The results indicate that the shot peening improves the fatigue life of drilled and undrilled samples. For the defects with the root radius of 0.895 mm, the shot peening leads to a 500% improvement in the fatigue life compared to unpeened samples regardless of defect depth. For the defects with the root radius of 0.585 mm, the improvement in fatigue life is 40% for the defect depth of 0.2 mm compared to unpeened samples. The improvement increases to 60% and 200% by increasing the defect depths to 0.4 mm and 0.6 mm. The fatigue properties are linked to the changes in the features of defects mainly caused by the deformation hardening and compressive residual stress after shot peening.

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Section: Residual Stressmentioning

confidence: 99%

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Saklakoğlu

Bolouri

İrizalp

et al. 2021

Int J Adv Manuf Technol

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“…To explain the matrix crack initiation process, Hillberry and Johnson (Ref 22) developed the strain-controlled matrix fatigue data and they modified the Smith-Watson-Topper effective strain parameter to predict cycles to fatigue damage initiation in the matrix material next to a notch. In addition to the above-mentioned studies, several researchers investigate the influence of notch on different kinds of MMCs (Ref [23][24][25]. However, considering the different features of matrix and reinforcement, we believe that the influence of notch on mechanical properties of C f /Mg composite needs to be further studied.…”

Section: Introductionmentioning

confidence: 95%

Influence of Notch on Mechanical Properties of Cf/Mg Composite Fabricated by LSEVI

Zhou

et al. 2015

J. of Materi Eng and Perform

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C f /Mg composite was fabricated by liquid-solid extrusion following vacuum infiltration technique and uniaxial tensile tests were conducted on the notched and unnotched specimens to investigate the mechanical properties of C f /Mg composite. The effects of circular notch on the notched strength, net tensile strength, tensile modulus, and fracture strain of C f /Mg composite were investigated. The notch sensitivity of C f /Mg composite was elucidated through the notch strength ratio (NSR), fracture surface, and fracture mechanism. By comparing the experimental and theoretical NSR, the influences of notch size and stress concentration factor on notch sensitivity of C f /Mg composite were investigated. The results showed that the fracture strain of the notched specimens increased with increasing the notch size. Meanwhile, net tensile strength, notched strength, and tensile moduli had opposite trends. The NSR had a functional relationship with the notch size and stress concentration factor caused by the notch had no influence on the NSR.

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“…The fatigue response of Al-based composites has been received reasonable attention in literature. The tensile responses [2][3][4], high cycle fatigue properties [5,6], low cycle fatigue properties [7,8], notch behaviour and fatigue life predictions [9][10][11][12][13] of Al-SiC p composites were extensively investigated. The fatigue response of the MMCs has been influenced by the type of matrix alloy, type of reinforcement (continuous, whisker or particle), composition of reinforcement, heat treatment, processing methods and volume fraction (V f ) and size of reinforcement (P z ) [1].…”

Section: Introductionmentioning

confidence: 99%

“…Many failures of structural parts in service occur under various loading and environmental conditions where characteristics of reinforcements may change the fatigue crack growth rates and crack initiation. Although, the tensile behaviour and some fatigue of this composites has been studied widely [1][2][3][4][5][6][7][8][9][10][11][12][13], the information available on their fatigue crack propagation is limited. In general, the role of the reinforcements particles are well understood in many studies, but there is no clear understanding of the effects of reinforcement particle size and volume fraction on the fatigue crack propagation rates of these composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of Particle Sizes and Volume Fractions on Fatigue Crack Growth Rates of Aerospace Al-Alloys Composites

Uygur

2024

Archives of Metallurgy and Materials

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Recently, the need to develop fuel efficient transport systems has led to the development of a range of materials of low density, high stiffness and high strength each can be made at a reasonable cost. The aluminium based alloys are particularly important because of their improved mechanical, physical and technical properties. Fatigue failures have been recognised since the early days of the industrial revolution. Fatigue response of most of materials is related with the microstructural variations in the structure. Hence, in this study, influence of particle size and volume fractions on fatigue properties of Al-alloy composites was investigated. It was found that particle size and volume fraction of reinforcement particles play significant role on fatigue propagation rates, stress intensity threshold values, crack tip opening distance and crack tip plastic zone sizes.

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Notch Behavior and Fatigue Life Predictions of Discontinuously Reinforced MMCs

Cited by 5 publications

References 15 publications

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Effects of shot peening and artificial surface defects on fatigue properties of 50CrV4 steel

Influence of Notch on Mechanical Properties of Cf/Mg Composite Fabricated by LSEVI

Influence of Particle Sizes and Volume Fractions on Fatigue Crack Growth Rates of Aerospace Al-Alloys Composites

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