Evaluations of the Irwin βIc adjustment for small specimen fracture toughness data |
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Authors: | J.G. Merkle |
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Affiliation: | Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA |
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Abstract: | Thickness size effects and large amounts of data scatter often occur in the cleavage fracture toughness testing of steel. It is shown that the Irwin βIc equation provides an effective adjustment for thickness size effects as well as reduces data scatter. Examples of applying the Irwin βIc adjustment to both static and dynamic toughness data are given. The significance of cleavage microcracking in the initiation of fast fracture is discussed and it is reasoned that this phenomenon is closely related to the sensitivity of the cleavage fracture toughness to triaxiality and strain rate. |
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