Abstract

The propagation of brittle fracture in steel was studied with the aid of ultra high-speed photography using an AVCO streak camera and a Barr and Stroud rotating mirror-framing camera. Also, the dynamic stress pattern caused by the running crack was investigated with the aid of a photostress sheet glued onto the surface of the steel plate, using the framing camera. From the experiments it was found that brittle fracture in steel propagates in an intermittent way. The apparatus and the optical methods are described and the striking results are given.

© 1964 Optical Society of America

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References

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  1. A. W. Sleeswijk, C. A. Verbraak, Acta Met. 9, 917 (1961).
    [CrossRef]
  2. C. A. Verbraak, Materialpruefung 3, 383 (1961).
  3. C. A. Verbraak, J. G. A. de Graaf, Proc. 6th Internatl. Congr. on High Speed Photography (Tjeenk Willink, Haarlam, Netherlands, 1963), p. 529.
  4. H. C. van Elst, Trans. Metal. Soc. AIME 230, 460 (1964).
  5. A. Skinner, J. Sci. Instr. 39, 336 (1962).
    [CrossRef]
  6. C. A. Cole, J. F. Quinlan, F. Zandman, Proc. 5th Internatl. Congr. on High Speed Photography (Soc. Motion Picture Television Engrs., New York, N.Y., 1962), p. 250.

1964

H. C. van Elst, Trans. Metal. Soc. AIME 230, 460 (1964).

1962

A. Skinner, J. Sci. Instr. 39, 336 (1962).
[CrossRef]

1961

A. W. Sleeswijk, C. A. Verbraak, Acta Met. 9, 917 (1961).
[CrossRef]

C. A. Verbraak, Materialpruefung 3, 383 (1961).

Cole, C. A.

C. A. Cole, J. F. Quinlan, F. Zandman, Proc. 5th Internatl. Congr. on High Speed Photography (Soc. Motion Picture Television Engrs., New York, N.Y., 1962), p. 250.

de Graaf, J. G. A.

C. A. Verbraak, J. G. A. de Graaf, Proc. 6th Internatl. Congr. on High Speed Photography (Tjeenk Willink, Haarlam, Netherlands, 1963), p. 529.

Quinlan, J. F.

C. A. Cole, J. F. Quinlan, F. Zandman, Proc. 5th Internatl. Congr. on High Speed Photography (Soc. Motion Picture Television Engrs., New York, N.Y., 1962), p. 250.

Skinner, A.

A. Skinner, J. Sci. Instr. 39, 336 (1962).
[CrossRef]

Sleeswijk, A. W.

A. W. Sleeswijk, C. A. Verbraak, Acta Met. 9, 917 (1961).
[CrossRef]

van Elst, H. C.

H. C. van Elst, Trans. Metal. Soc. AIME 230, 460 (1964).

Verbraak, C. A.

A. W. Sleeswijk, C. A. Verbraak, Acta Met. 9, 917 (1961).
[CrossRef]

C. A. Verbraak, Materialpruefung 3, 383 (1961).

C. A. Verbraak, J. G. A. de Graaf, Proc. 6th Internatl. Congr. on High Speed Photography (Tjeenk Willink, Haarlam, Netherlands, 1963), p. 529.

Zandman, F.

C. A. Cole, J. F. Quinlan, F. Zandman, Proc. 5th Internatl. Congr. on High Speed Photography (Soc. Motion Picture Television Engrs., New York, N.Y., 1962), p. 250.

Acta Met.

A. W. Sleeswijk, C. A. Verbraak, Acta Met. 9, 917 (1961).
[CrossRef]

J. Sci. Instr.

A. Skinner, J. Sci. Instr. 39, 336 (1962).
[CrossRef]

Materialpruefung

C. A. Verbraak, Materialpruefung 3, 383 (1961).

Trans. Metal. Soc. AIME

H. C. van Elst, Trans. Metal. Soc. AIME 230, 460 (1964).

Other

C. A. Verbraak, J. G. A. de Graaf, Proc. 6th Internatl. Congr. on High Speed Photography (Tjeenk Willink, Haarlam, Netherlands, 1963), p. 529.

C. A. Cole, J. F. Quinlan, F. Zandman, Proc. 5th Internatl. Congr. on High Speed Photography (Soc. Motion Picture Television Engrs., New York, N.Y., 1962), p. 250.

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Figures (9)

Fig. 1
Fig. 1

Scheme of the experimental arrangement in a Robertson apparatus. (a) General layout. (b) Initiation region for experiments when the fracture was started by a bolt-gun. (c) Initiation region for experiments when the fracture was started by a detonator.

Fig. 2
Fig. 2

Intensity vs time curve of the rectangular flash.

Fig. 3
Fig. 3

Optical arrangement for the streak camera experiments.

Fig. 4
Fig. 4

Optical arrangement for the framing camera experiments.

Fig. 5
Fig. 5

Optical arrangement for the recording of the stress pattern.

Fig. 6
Fig. 6

Some examples of streak photographs of the propagating fracture. (a) Fracture nearly 100% brittle. (b) Fracture at temperature appreciably below transition temperature. (c) Fracture at temperature slightly below transition temperature.

Fig. 7
Fig. 7

Sequence of 30 pictures from a framing camera recording.

Fig. 8
Fig. 8

Single picture of the running fracture, time of exposure 1/μsec.

Fig. 9
Fig. 9

Framing camera recording of (a) the stress pattern at the tip of a running fracture; (b) stress waves propagating ahead of the running fracture.

Tables (1)

Tables Icon

Table I Temperature and Fracture Propagation Parameters

Metrics