Some Aspects of Non-Linear Fracture Mechanics

Carlsson, A. J.; Markström, Karl

doi:10.1016/b978-0-08-022136-6.50046-9

Cited by 7 publications

(1 citation statement)

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“…Previous investigations have shown that elastic plastic fracture toughness parameters exhibit scatter up to -+40% even under well controlled testing conditions. A discussion of this subject concerning 6 may be found in [15] and concerning J in [16].…”

Section: - 2omentioning

confidence: 99%

Comparison of J testing techniques and correlation J-COD using structural steel specimens

1981

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J integral and COD measurements were made simultaneously on three-point bend specimens of 50D structural steel (specification BS4360). Tests were performed at temperatures over the range -100°C up to room temperature, and at each temperature a series of specimens with a/W ranging from 0.2 to 0.8 were tested.Using a value of J derived from the equation J =-(l/B)(dU/da), it was shown that J, (where the subscript e denotes the critical value for unstable crack propagation) was a function of a[W at -80°C, decreasing with the increase in crack length, whereas at lower temperatures J, was found to be insensitive to a/W. Measurements of Jm~x at temperatures corresponding to the upper shelf regime of the material also presented the trend of decreasing J ..... with increasing value of a/W.A study of the range of applicability of the commonly used approximate expression J = 2U/B(W -a) was carried out, and it was found to agree well with theoretical values for 0.4 < a/W < 0.6.At each test temperature, a constant relationship betwee 3, and 6, (critical value of the crack opening displacement) was determined which was independent of a/W, showing that COD and J are subject to the same limitations in specimen dimensions. This work supports the stlggestion that Jc values should be obtained on material of the full thickness of interest, as is accepted practice for COD. The value of m in the relationship J = m~r~6 was shown to depend upon test temperature with values varying from m ~ 1.8 at -10 ° to 1.3 at -100°C.

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Section: - 2omentioning

confidence: 99%