A discrete dislocation model of Stage I fatigue crack growth and an analysis of Mode Ⅰ to Mode Ⅱ transition at low AK

机译：低AK下I期疲劳裂纹扩展的离散位错模型及Ⅰ至Ⅱ型转变的分析。

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Simulations of dislocations nucleation and glide ahead of a crystallographic mode Ⅱ crack are performed for push-pull and reversed torsion. An influence of the normal stress on the friction of crack flanks, as well as on the condition for dislocation emission is introduced. The crack growth rates are deduced from the dislocation fluxes at the crack tip. A comparison between the loading modes is made. Taking into account the presence of grain boundaries, the repeated decelerations and sometimes the arrest that characterise Stage Ⅰ crack growth are described by the model. An analysis of the transition from mode Ⅰ to mode Ⅱ crack growth observed at low ΔK_I in single crystals is proposed.

机译：对推拉和扭转扭转进行了晶体学Ⅱ型裂纹前位错形核和滑动的模拟。介绍了正应力对裂纹侧面摩擦以及位错释放条件的影响。裂纹扩展速率由裂纹尖端的位错通量推导出来。比较加载方式。考虑到晶界的存在，该模型描述了表征阶段Ⅰ裂纹扩展的反复减速和有时停滞。提出了在低ΔK_I下观察到的单晶从Ⅰ型到Ⅱ型裂纹扩展的转变的分析。

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《6th Japan-France Materials Science Seminar JFMSS-6 on Microstructural Design for Improved Mechanical Behaviour of Advanced Materials Oct 4-6, 1999, Poitiers, France》|1999年|p.145-150|共6页
会议地点 Poitiers(FR);Poitiers(FR)
作者
V. Doquet;
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Laboratoire de Mecanique des Solides, UMR 7649 du CNRS, Ecole Polytechnique, 91128 Palaiseau cedex, France;

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原文格式 PDF
正文语种 eng
中图分类一般工业技术;
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1. A discrete dislocation model of Stage I fatigue crack growth and an analysis of Mode I to Mode II transition at low ΔK_I [J] . V. Doquet Journal de Physique, IV: Proceedings of International Conference . 2000,第6期

机译：低ΔK_I下I期疲劳裂纹扩展的离散位错模型和I至II型转变的分析
2. Hybrid discrete dislocation models for fatigue crack growth [J] . W.A. Curtin, V.S. Deshpande, A. Needleman, International Journal of Fatigue . 2010,第9期

机译：疲劳裂纹扩展的混合离散位错模型
3. The discrete nature of the growth and arrest of microstructurally short fatigue cracks modelled by dislocation technique [J] . C. Bjerken International Journal of Fatigue . 2005,第1期

机译：用位错技术建模的微结构短疲劳裂纹的生长和停止的离散性质
4. A discrete dislocation model of Stage I fatigue crack growth and an analysis of Mode Ⅰ to Mode Ⅱ transition at low AK [C] . V. Doquet Japan-France materials science seminar on microstructural design for improved mechanical behaviour of advanced materials . 1999

机译：低AK阶段疲劳裂纹裂纹裂纹增长的离散位错模型及模式Ⅰ至MODEⅡ过渡的分析
5. A model on fatigue crack growth rates in the threshold region in polycrystalline metallic materials and analysis of crack closure. [D] . Medapuram, Bhaskar. 1996

机译：多晶金属材料阈值区域疲劳裂纹扩展速率模型及裂纹闭合分析。
6. Sensitivity Analysis of Fatigue Crack Growth Model for API Steels in Gaseous Hydrogen [O] . Robert L Amaro, Neha Rustagi, Elizabeth S Drexler, 2014

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7. A discrete dislocation model of Stage I fatigue crack growth and an analysis of Mode I to Mode II transition at low ΔK1 [O] . V. Doquet 2000

机译：阶段I疲劳裂纹增长的离散位错模型及模式I在低ΔK1下模式I II转换的分析
8. The Effect of Environment on the Transition from Tensile Mode to Shear Mode During Fatigue Crack Growth in Aluminum Alloys. A Model for Environmentally Assisted Crack Growth [R] . Vogelesang, L. B. 1979

机译：铝合金疲劳裂纹扩展过程中环境对拉伸模式向剪切模式转变的影响。环境辅助裂纹扩展模型

A discrete dislocation model of Stage I fatigue crack growth and an analysis of Mode Ⅰ to Mode Ⅱ transition at low AK

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