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The effects of substructure on fatigue crack propagation

Abstract

The correlation between the initiation and propagation of fatigue cracks and the substructure formation was examined using aluminium specimens. The effects of substructures introduced by static and alternating stresses and those of the recovery of the substructure on the propagation rates of fatigue cracks were also studied.

Observations of the substructures were made by means of the X-ray micro-beam technique. The principal results obtained are as follows:

  1. (1)

    At the time of fatigue crack initiation a definite substructure develops at the root of a notch made on the specimen edge.

  2. (2)

    The rate of fatigue crack propagation has a relation to the characteristics of the substructures at the tip of the fatigue cracks.

  3. (3)

    While the rates of propagation are retarded by static pre-strains, they increase in proportion to the degree of substructure formation due to alternating stresses.

  4. (4)

    The rates are usually reduced by the recovery after alternating deformation.

On the basis of the above results, the significance of substructures for fatigue fracture is discussed.

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Our thanks are due to Messrs. M. Katsumata and S. Takeda for their assistance in the performance of the experiments.

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Karashima, S., Ogura, T. The effects of substructure on fatigue crack propagation. Czech J Phys 19, 362–375 (1969). https://doi.org/10.1007/BF01712879

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Keywords

  • Aluminium
  • Fatigue
  • Fatigue Crack
  • Crack Initiation
  • Propagation Rate