安定延性亀裂成長から不安定破壊への遷移について

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In fracture safe design of welded steel structure, it is one of the way to prevent the unstable brittle fracture beyond general yield, or under the case in which overall strain of welded member at fracture becomes beyond yield strain of material used. Generally, stable fibrous crack growth from the tip of pre-existing crack proceeds before unstable brittle fracture. Investigation has been carried out on the mechanical behaviors of stable fibrous crack to unstable fracture transition. In the present paper, attention is focussed on the experimental study on the effects of various factors such as crack size, mode of loading and pre-straining on transition behaviors, and to the consideration of property of COD-criterion as the criterion which unstable brittle fracture with stable fibrous crack starts to grow. Main results are summarized as follows : (1) In the unstable brittle fracture with stable fibrous crack, the length of stable fibrous crack at brittle fracture, l_F, is independent on the various factors such as crack size, mode of loading and pre-straining under a certain temperature. However, the relationship of fibrous crack length vs. crack opening displacement at initial crack tip is different between tensile straining test and bending test. (2) The COD-criterion is applicable to the criterion of starts of unstable brittle fracture in the engineering sense if using the value obtained by tensile test as the critical COD value.
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安定延性亀裂成長から不安定破壊への遷移について

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