A microscopic theory of brittle fracture in deformable solids: A relation between ideal work to fracture and plastic work

Jokl, M.L.; Vítek, V.; McMahon, C.J.

doi:10.1016/0001-6160(80)90048-6

Cited by 239 publications

(74 citation statements)

References 19 publications

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“…Rather, w p is a direct and increasing function of the local fracture energy, 2c pz , as pointed out in several earlier works [27][28][29]. Thus, 2c pz directly governs G c , the term w p serving only to amplify variations in this local fracture energy.…”

Section: Introductionmentioning

confidence: 79%

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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Section: Introductionmentioning

confidence: 79%

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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“…These facts can be reconciled through recognition that although the work of fracture is dominated by plastic deformation. yp is not an independent material parameter [31,34].…”

Section: Discussionmentioning

confidence: 99%

“…The maximum tensile stress across the boundary is limited by the local resistance of the grain boundary to shear accomodation. It should be noted here that bond-breaking at the grain boundaries and plastic relaxation are competitive processes and both may occur before one begins to dominate [31][32][33][34]. The magnitude of grain boundary stress concentrations.…”

Section: B Intergranular Eabrittlementmentioning

confidence: 93%

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Control of cryogenic intergranular fracture in high-manganese austenitic steels

Strum¹

1986

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“…Although the last three terms appear to be simply additive, it should be noted that both U f (W A ) and U s (W A ) are functions of the true work of adhesion [7] and in many cases U fric (W A ) will be as well.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of the Precracked Line Scratch Test

2000

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In MEMS packages and silicon devices, the adhesion of interconnects to the substrate is a critical reliability issue. A Precracked Line Scratch Test (PLST) is among one of the available tests to measure the thin line adhesion. In the test, an initial crack is introduced at the interface between the thin line and the substrate. The line is then loaded from the precracked end. The load is recorded continuously while the crack propagates before and after the line buckles. This precracked line scratch test has been applied earlier to tungsten thin lines on silicon wafers [1]. A macroscopic version of the test was also performed to evaluate the analytical model [2]. In the macroscopic tests, polycarbonate lines were bonded to steel substrates with cyanoacrylate.In this paper, finite element analysis is performed for the Precracked Line Scratch Test before line buckling. The energy release rates and phase angles are calculated based on the corresponding load and crack length. The results are then compared to the closed-form solution. Macroscopic experimental model along with the finite element solution has provided a way to derive the interface fracture toughness as a function of the crack length based on the load and crack length history. With the analysis in place, the precracked line scratch test can be used conveniently to study the adhesion of interconnects to passivation layers, MEMS devices and packages on different scales.

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A microscopic theory of brittle fracture in deformable solids: A relation between ideal work to fracture and plastic work

Cited by 239 publications

References 19 publications

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

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

Control of cryogenic intergranular fracture in high-manganese austenitic steels

Finite Element Analysis of the Precracked Line Scratch Test

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