大锻件微孔隙氢致内力耦合作用对裂纹扩展的影响
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摘要
基于大锻件氢压理论,从断裂力学角度出发,建立了微裂纹与微孔隙耦合作用的力学判据,采用有限元法分析了不同情况下微孔隙的耦合作用对微裂纹断裂参量的影响。分析结果表明,微裂纹的扩展受微孔隙氢压应力场的影响十分明显,其效果和强度与微孔隙的尺寸和位置有关,在相同的尺寸下孔洞类微孔隙对微裂纹扩展影响最大。分析结论为大锻件内部裂纹扩展研究提供了理论基础。
Based on hydrogen pressure theory in heavy forging,the mechanical criteria for crack coupling with other micropores was established from the fracture mechanics,and the impact of micropores' coupling effect on crack's fracture parameters under different conditions was analyzed by finite element method.The results indicate that the influence of micropore's hydrogen stress field on the crack's propagation is very obvious,and the effect and intensity of impact are connected with the size and position of micropores.In addition,the void-microspores have the greatest effect on crack propagation under the same micropore size.The analysis conclusion provides the foundation for the study of crack propagation in heavy forging.
Based on hydrogen pressure theory in heavy forging,the mechanical criteria for crack coupling with other micropores was established from the fracture mechanics,and the impact of micropores' coupling effect on crack's fracture parameters under different conditions was analyzed by finite element method.The results indicate that the influence of micropore's hydrogen stress field on the crack's propagation is very obvious,and the effect and intensity of impact are connected with the size and position of micropores.In addition,the void-microspores have the greatest effect on crack propagation under the same micropore size.The analysis conclusion provides the foundation for the study of crack propagation in heavy forging.
引文
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[2]陈德和.钢的缺陷[M].北京:机械工业出版社,1966.
[3]张之立.断裂之间的相互作用和应力场计算[J].地震学报,1994,16(1):32-40.Zhang Zhili.The Interaction between Fracture and Stress Field Calculation[J].Acta Seismologica Sini-ca,1994,16(1):32-40.
[4]黄明利,唐春安,梁正召.岩石裂纹相互作用的应力场分析[J].东北大学学报(自然科学版),2001,22(4):446-449.Huang Mingli,Tang Chunan,Liang Zhengzhao.Stress Field Analysis of Interaction of Rock Cracks[J].Journal of Northeastern University(Natural Science Edition),2001,22(4):446-449.
[5]郭树祥,许希武.任意多孔多裂纹有限大板的应力强度因子分析[J].固体力学学报,2005,26(3):351-358.Guo Shuxiang,Xu Xiwu.A Study on The Stress In-tensity Factors of A Finite Plate with Multiple El-liptical Holes and Cracks[J].Acta Mechanica Solida Sinica,2005,26(3):351-358.
[6]王清远,刘永杰,曾祥国.多裂纹相互作用下混凝土断裂参量的有限元数值分析[J].四川建筑科学研究,2006,32(6):73-77.Wang Qingyuan,Liu Yongjie,Zeng Xiangguo.FiniteElement Numerical Analysis of Fracture Parameters of Multiple Interacting Cracks in Concrete[J].Si-chuan Building Science,2006,32(6):73-77.
[7]卿海,杨卫,吕坚.多条表面裂纹相互作用的应力分析[J].工程力学,2009,26(1):1-6.Qing Hai,Yang Wei,LüJian.Stress Analysis of Multiple Surface Cracks with Interactions[J].Engi-neering Mechanics,2009,26(1):1-6.
[8]Gorbatikh L,Kachanov M.A Simple Technique for Constructing the Full Stress and DisplacementFields in Elastic Plates with Multiple Cracks[J].Engineering Fracture Mechanics,2000,66(1):51-63.
[9]Han X,Ellyin F,Xia Z.Interaction among Interface,Multiple Cracks and Dislocations[J].International Journal of Solids and Structures,2002,39(6):1575-1590.
[10]Li Y P,Tham L G,Wang Y H.A Modified Kacha-nov Method for Analysis of Solids with Multiple Cracks[J].Engineering Fracture Mechanics,2003,70(9):1115-1129.
[11]Jones R,Peng D,Pitt S.Assessment of Multiple Flat Elliptical Cracks with Interactions[J].Theo-retical and Applied Fracture Mechanics,2002,38(3):281-291.
[12]Kamaya M,Totsuka N.Influence of Interaction be-tween Multiple Cracks on Stress Corrosion Crack Propagation[J].Corrosion Science,2002,44(10):2333-2352.(编辑卢湘帆)
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