Journal of Materials Science

, Volume 28, Issue 12, pp 3385–3390 | Cite as

Simulation of crack propagation in porous compacted specimens of aspirin

  • R. C. Rowe
  • R. J. Roberts
Papers
Received:
Accepted:

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.

Keywords

Polymer Aspirin Stress Intensity Intensity Factor Fracture Mechanism 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Nomenclature

a

Polar coordinate with origin at the crack tip

Cd

Propagation velocity of the irrotational wave

E

Young's modulus of elasticity

H

Indentation hardness

K

Stress intensity factor at the crack tip

KIC

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

This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    A. B. Mashadi and J. M. Newton, J. Pharm. Pharmacol. 39 (1987) 961.Google Scholar
  2. 2.
    R. J. Roberts and R. C. Rowe, Int. J. Pharm. 52 (1989) 213.CrossRefGoogle Scholar
  3. 3.
    P. York, F. Bassam, R. C. Rowe and R. J. Roberts, ibid. 66 (1990) 143.CrossRefGoogle Scholar
  4. 4.
    R. J. Roberts, R. C. Rowe and P. York, ibid. (1992) in press.Google Scholar
  5. 5.
    A. B. Mashadi and J. M. Newton, J. Pharm. Pharmacol. 40 (1988) Suppl. 120 p.Google Scholar
  6. 6.
    K. B. Broberg in Advances in Constitutive Laws for Engineering Materials, edited by F. Jinghong and S. Murakami, Vol. 1, Pergamon, Oxford, 1989 pp. 255–358.Google Scholar
  7. 7.
    K. B. Broberg, Int. J. Fract. 42 (1990) 277.CrossRefGoogle Scholar
  8. 8.
    R. C. Rowe and R. J. Roberts, Powder Technol. submitted.Google Scholar
  9. 9.
    K. B. Broberg, personal communication (1990).Google Scholar
  10. 10.
    H. Gucluyildiz, G. S. Banker and G. E. Peck, J. Pharm. Sci. 66 (1977) 407.Google Scholar
  11. 11.
    K. Ridgway, E. Shotten and J. Geasby, J. Pharm. Pharmacol. 21 (1969) Suppl. 19S.Google Scholar
  12. 12.
    R. J. Roberts, R. C. Rowe and P. York, Powder Technol. 65 (1991) 139.Google Scholar
  13. 13.
    K. Ridgway, M. E. Aulton and P. H. Rosser, J. Pharm. Pharmacol. 22 (1970) 70S.Google Scholar
  14. 14.
    R. C. Rowe and R. J. Roberts, Int. J. Pharm. 78 (1992a) 49.CrossRefGoogle Scholar
  15. 15.
    Idem, ibid. 86 (1992) 49.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • R. C. Rowe
    • 1
  • R. J. Roberts
    • 1
  1. 1.ICI PharmaceuticalMacclesfieldUK

Personalised recommendations