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Simulation of crack propagation in porous compacted specimens of aspirin

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Abstract

A model originally developed to simulate crack propagation in structural steel has been evaluated for porous compacted specimens of aspirin. The fracture mechanism is assumed to consist of hole growth and coalescence. The program allows both visualization of crack growth and the calculation of crack velocity. Simulations to investigate the effect of stress intensity factor indicate that the critical stress intensity factor for sustained growth for aspirin is of the order of 0.15 MPa m1/2 consistent with experimental findings. The program is easy to use enabling many simulations to be performed with minimum effort.

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Abbreviations

a :

Polar coordinate with origin at the crack tip

C d :

Propagation velocity of the irrotational wave

E :

Young's modulus of elasticity

H :

Indentation hardness

K :

Stress intensity factor at the crack tip

K IC :

Critical stress intensity factor

n :

The exponent

R :

Radius of the hole/pore

t :

Time

V :

Crack-tip velocity

β:

Fluidity (i.e. the reciprocal of the viscosity)

δ:

The smoothening length

θ:

Polar coordinate with origin at the crack tip

ϱ:

True density

σ:

Stress

σ0 :

Flow or yield stress

ν:

Poisson's ratio

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Authors and Affiliations

  1. ICI Pharmaceutical, Alderley Park, SK10 2NA, Macclesfield, Cheshire, UK

    R. C. Rowe & R. J. Roberts

Authors
  1. R. C. Rowe
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  2. R. J. Roberts
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Rowe, R.C., Roberts, R.J. Simulation of crack propagation in porous compacted specimens of aspirin. JOURNAL OF MATERIALS SCIENCE 28, 3385–3390 (1993). https://doi.org/10.1007/BF00354262

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  • DOI: https://doi.org/10.1007/BF00354262

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