A Phenomenological Theory of Sintering

MacKenzie, J.K.; Shuttleworth, R.

doi:10.1088/0370-1301/62/12/310

Cited by 563 publications

(348 citation statements)

References 10 publications

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“…Mackenzie & Shuttleworth 1952) or are approximate, being based on energy balance arguments with no detailed resolution of the flow fields (e.g. Frenkel 1945).…”

Section: Introductionmentioning

confidence: 99%

An elliptical-pore model for late-stage planar viscous sintering

Crowdy

2004

J. Fluid Mech.

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A simple 'elliptical-pore model' of the shrinkage of compressible pores in late-stage planar viscous sintering is proposed. The model is in the spirit of matched asymptotics and relies on splitting the flow into an 'inner' and 'outer' problem. The inner problem in the vicinity of any given pore involves solving for its free-surface evolution exactly using complex-variable methods. The outer flow due to all other pores is assumed to be given by an assembly of point sinks/sources. As a test of the model, the evolution of a singly infinite periodic row of compressible pores is considered in detail. The effectiveness of the simple model is tested by comparison with a full numerical simulation. A novel boundary integral method based on Cauchy potentials and conformal mapping is used. In the case of pores with constant pressure, it is found that pores shrink faster than if in isolation. Compressible pores obeying the ideal gas law are also studied and are found to tend to a quasi-steady non-circular state. A higher-order model is also presented and compared with numerical simulations of the viscous sintering of a doubly periodic array of pores in Stokes flow.

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“…Mackenzie & Shuttleworth 1952) or are approximate, being based on energy balance arguments with no detailed resolution of the flow fields (e.g. Frenkel 1945).…”

Section: Introductionmentioning

confidence: 99%

An elliptical-pore model for late-stage planar viscous sintering

Crowdy

2004

J. Fluid Mech.

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“…Particle sintering or particle coalescence is the process where two or more adjacent particles form necks and bond together because of a reduction of the free surface energies of the particle involved [23]. This energy reduction can be triggered by a high pressure or an elevated temperature [24].…”

Section: Hot Stage Microscopymentioning

confidence: 99%

Polymer viscosity, particle coalescence and mechanical performance in high-temperature laser sintering

et al. 2016

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High Temperature Laser Sintering (HT-LS) is an additive manufacturing technology whose potential could be limited by the restricted number of materials optimised for the process. Poly Ether Ether Ketone (PEEK) with different melt viscosity values, PEEK 150PF and PEEK 450PF, have been used in parallel with the commercial grade, Poly Ether Ketone (PEK) HP3, to investigate the role of material viscosity on particle coalescence, parts structure and mechanical performance in HT-LS. The material with lower viscosity, PEEK 150PF, was found to exhibit faster coalescence and lower tensile strength than the grades with higher viscosities, PEEK 450PF and PEK HP3.

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“…The rate of densification ( ) is first derived by Frenkel and later expanded upon [21][22][23] to be a temperature dependent function given by…”

Section: Numerical Simulationmentioning

confidence: 99%

The Laser Interlaminar Reinforcement of Continuous Glass Fiber Composites

Bian

Satoh

Yao

2015

Journal of Manufacturing Science and Engineering

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Inter-laminar crack initiation and propagation is a major mode of failure in laminate fiber reinforced composites. A laser reinforcement process is developed to bond layers of glass fabric prior to the vacuum assisted transfer molding of laminate composites. Glass fabric layers are bonded by fusing a dense glass bead to fibers within the laser focal volume, forming a 3D reinforcement architecture. Coupled heat transfer and viscous flow modeling is used to capture the temperature and morphology evolution of glass during the reinforcement process under experimentally observed conditions. Mode I double cantilever beam testing is performed to quantify the effects of laser inter-laminar reinforcements on composite delamination resistance.Post mortem high resolution imaging of the fracture surface is used to characterize the toughening mechanism of the inter-laminar reinforcements. Improved delamination resistance of laser reinforced composites derives from crack arrest and deflection mechanisms, showing a positive correlation to the reinforcement thickness.

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A Phenomenological Theory of Sintering

Cited by 563 publications

References 10 publications

An elliptical-pore model for late-stage planar viscous sintering

An elliptical-pore model for late-stage planar viscous sintering

Polymer viscosity, particle coalescence and mechanical performance in high-temperature laser sintering

The Laser Interlaminar Reinforcement of Continuous Glass Fiber Composites

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