| Influence of material＇s cyclic deformation behaviour on fatigue crack growth threshold |
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| 引用本文： | 张瑞,孙毅,王振清.Influence of material＇s cyclic deformation behaviour on fatigue crack growth threshold[J].哈尔滨工业大学学报(英文版),2008,15(1):124-128. |
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| 作者姓名： | 张瑞 孙毅 王振清 |
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| 作者单位： | ZHANG Rui（School of Civil Engineering, Harbin Engineering University, Harbin 150001, China） ;
SUN Yi（Dept. of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001, China） ;
WANG zhen-qing（School of Civil Engineering, Harbin Engineering University, Harbin 150001, China） ; |
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| 基金项目： | Sponsored by the Fundamental Research Foundation of Harbin Engineering University( Grant No. HEUFT07007). |
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| 摘 要： | To investigate the relation between material＇s cychc plastic behaviour and fatigue crack growth, a new model is proposed. The model incorporated the two intrinsic properties of material＇ s cyclic plastic and crack tip＇ s deformation dislocation to interpret fatigue crack threshold. The relation between material＇ s cyclic hardening parameters （cyclic hardening amplitude and cyclic hardening rate） and fatigue threshold is studied. Fatigue threshold is determined based on the dislocation-free zone （DFZ） model, the theory of cohesive zone and the cyclic deformation behaviour. The results show that fatigue threshold increases with the decrease of the amplitude of cyclic hardening and is independent of cyclic hardening rate, but fatigue crack growth rate increases with the increase of cyclic hardening rate.
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| 关 键 词： | 强度理论 实验研究 疲劳损伤 物理学 |
Influence of material's cyclic deformation behaviour on fatigue crack growth threshold |
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| ZHANG Rui,SUN Yi,WANG zhen-qing.Influence of material''''s cyclic deformation behaviour on fatigue crack growth threshold[J].Journal of Harbin Institute of Technology,2008,15(1):124-128. |
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| Authors: | ZHANG Rui SUN Yi WANG zhen-qing |
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| Affiliation: | 1. School of Civil Engineering, Harbin Engineering University, Harbin 150001, China
2. Dept. of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | To investigate the relation between material's cyclic plastic behaviour and fatigue crack growth, a new model is proposed. The model incorporated the two intrinsic properties of material' s cyclic plastic and crack tip' s deformation dislocation to interpret fatigue crack threshold. The relation between material's cyclic hardening parameters (cyclic hardening amplitude and cyclic hardening rate) and fatigue threshold is studied. Fatigue threshold is determined based on the dislocation-free zone (DFZ) model, the theory of cohesive zone and the cyclic deformation behaviour. The results show that fatigue threshold increases with the decrease of the amplitude of cyclic hardening and is independent of cyclic hardening rate, but fatigue crack growth rate increa-ses with the increase of cyclic hardening rate. |
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| Keywords: | fatigue crack growth threshold cyclic saturation hardening behaviour the dislocation-free zone |
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