Micro- and macrostructural factors in DRA fracture resistance

Hunt, Warren H.; Osman, Todd M.; Lewandowski, John J.

doi:10.1007/bf03223363

Cited by 63 publications

(31 citation statements)

References 2 publications

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“…This was shown by Davidson [5][6][7] using a stereo-imaging technique to visualise crack-tip strain fields, and was later qualitatively corroborated by Flom and Arsenault [8]. Other fracture data confirm that a significant plastic zone is formed: K Ic values exceeding 20 MPa m 1=2 have indeed been reported in various studies or reviews [3,[9][10][11][12][13][14][15]. According to elementary fracture mechanics, such toughness values must be associated with significant crack-tip plastic deformation given the moderate yield stress of these materials.…”

Section: Introductionmentioning

confidence: 64%

Investigation of crack-tip plasticity in high volume fraction particulate metal matrix composites

Miserez

Rossoll

Mortensen

2004

Engineering Fracture Mechanics

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Crack-tip strain fields in high volume fraction ceramic particle reinforced metal matrix composites are assessed using photoelastic measurements. It is shown that the size of the significant crack-tip plastic zones that form in these materials depends on the type and diameter of the reinforcement and on the matrix material. This plastic zone size correlates well with the macroscopic toughness values assessed through J -integral testing. The composites are thus ''metallic'' in the sense that their toughness is mostly composed of plastic energy dissipation around the crack tip. Plastic deformation also induces marked constraint effects that influence the shape of the surface strain fields. It is shown that finite element analysis must be three-dimensional to describe these strain fields, as two-dimensional plane-stress analysis fails to reproduce the experimental data.

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Section: Introductionmentioning

confidence: 64%

Investigation of crack-tip plasticity in high volume fraction particulate metal matrix composites

Miserez

Rossoll

Mortensen

2004

Engineering Fracture Mechanics

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“…In what follows, the composites will be designated as follows: the first letter indicates the chemistry of the particles (A for Al 2 O 3 and B for B 4 C), the following number determines the average reinforcement size measured by centrifugal sedimentation. 1 For Al 2 O 3 composites a letter is finally added to differentiate between angular (a) or polygonal (p) particles.…”

Section: Materials Processing and Designationmentioning

confidence: 99%

“…To understand why, the influence of main microstructural variables such as the type and size of the reinforcement, or the composition and heattreatment of the matrix, have been widely examined; several reviews devoted to the fracture of PRMMCs provide an overview of this large body of information [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

Miserez

2004

Acta Materialia

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Model composites of pure Al reinforced with 50% ceramic particles are produced by infiltration. The composite fracture energy is measured by J -integral testing. Marked R-curve behaviour is found. The J-R curves exhibit a break in their slope at a well-defined point. This point is shown to denote the onset of macroscopic crack propagation and is used to assess the composite toughness.Toughness reaches values as high as 40 MPa ffiffiffiffi m p . Quantitative metallography and stereoscopic reconstructions of fracture surfaces are used to estimate the local work of fracture in the process zone. The measured (total) fracture energy is about ten times the estimated local fracture energy, for all composites. The main contribution to their total fracture energy is thus from plastic dissipation around the crack-tip; however, the toughness is still dictated by the local fracture energy. This study hence experimentally substantiates the ''valve'' concept in fracture mechanics.

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“…Such embrittling phases can form at various stages of composite processing: by reaction between the matrix and the reinforcement, during solidification, or during heat-treatment. [7][8][9][10][11][12][13][14] Even small quantities of brittle second phases, particularly if these are located along the matrix/reinforcement interface, are well-documented to affect the toughness and tensile ductility of metal matrix composites, [13][14][15][16][17][18][19] particularly when they exceed a relatively small critical thickness. [20][21][22][23][24] A second factor in matrix selection is the need for strong interfacial bonding, this being especially important in particulate composites.…”

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confidence: 99%

Increasing the Strength/Toughness Combination of High Volume Fraction Particulate Metal Matrix Composites using an Al‐Ag Matrix Alloy

2006

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Ceramic reinforced metals, despite superior properties such as specific stiffness, are often considered as too brittle for structural applications. We show that despite a high ceramic particle content (60 vol.%), aluminium matrix composites can be made to exhibit a fracture toughness matching that of unreinforced aluminium alloys, provided critical microstructural parameters are controlled. We here use an unconventional Al‐Ag matrix to simultaneously increase the strength and the toughness of this class of composite.

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Micro- and macrostructural factors in DRA fracture resistance

Cited by 63 publications

References 2 publications

Investigation of crack-tip plasticity in high volume fraction particulate metal matrix composites

Investigation of crack-tip plasticity in high volume fraction particulate metal matrix composites

Fracture of aluminium reinforced with densely packed ceramic particles: link between the local and the total work of fracture

Increasing the Strength/Toughness Combination of High Volume Fraction Particulate Metal Matrix Composites using an Al‐Ag Matrix Alloy

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