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首页> 美国政府科技报告 >Crack Branching Behavior in Stress Corrosion Cracking of High Strength Steel.
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Crack Branching Behavior in Stress Corrosion Cracking of High Strength Steel.

机译：高强钢应力腐蚀开裂中的裂纹分支行为。

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Stress corrosion cracking (SCC) tests were conducted for low tempered AISI 4340 steel in 0.1N H2S04 solution and the effect of cracking branching on SCC was discussed on the basis of the stress distribution around crack tip and the dislocation pile-up model with the hydrogen atom interaction. The macro-branching angle, and the stress intensity factor at macro branching, are predicted from the present theory. The predicted values are very close to the experimental values. The angle was constant independent of K(MB) and was about 60. The value K(MB) was equal to or larger than 2.5 times K (ISCC) for 200 C and 400 C tempered specimens. When macro branching crack occurs, the time to crack growth initiation at any stress intensity factor is prolonged to an almost constant value and crack growth rate, V is independent of stress intensity factor. Moreover, the main crack is accomplished with many micro branching cracks as a preliminary stage for the macro branching crack. Keywords: Stress corrosion; Crack tip; Macro-branching crack; Stress intensity factor. Reprints. (js)

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