结构疲劳长裂纹扩展速率新模型研究

刘建涛; 杜平安; 黄明镜; 周晴

doi:10.3879/j.issn.1000-0887.2009.05.004

结构疲劳长裂纹扩展速率新模型研究

doi: 10.3879/j.issn.1000-0887.2009.05.004

电子科技大学机械电子工程学院, 成都 610054;2.中国燃气涡轮研究院, 四川江油 621703

基金项目: “十一五”总装预先研究基金资助项目(YG060101C)

详细信息

作者简介:
刘建涛(1982- ),男,石家庄人,博士(联系人.Tel:+86-28-83206719;E-mail:jiantaoliu_uestc@163.com).

中图分类号: O346.2;TB114.3
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出版历程
- 收稿日期: 2008-11-10
- 修回日期: 2009-03-04
- 刊出日期: 2009-05-15

Research on New Model of Long Fatigue Crack Propagation Rates for Structures

College of Mechanical and Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China;

摘要

摘要: 比较现有疲劳长裂纹扩展速率模型的特点和不足，基于裂纹扩展钝化复锐理论推导，提出了广义钝化复锐疲劳长裂纹扩展速率模型（GPLFCPRM），并推导获得了疲劳长裂纹扩展速率模型通项．该模型克服了现有疲劳长裂纹扩展速率模型的缺点，能有效地描述自门槛值到断裂点全过程的裂纹扩展规律，具有明确的物理含义，且可反映材料的强度特性、断裂特性和热处理状态等因素对疲劳裂纹扩展速率的影响．通过LZ 50钢、A533-B、AlZnMgCu 0.5和0.5Cr 0.5Mo 0.25V钢疲劳裂纹扩展速率试验，结果反映该模型与试验结果十分吻合，且具有更广的通用性和应用推广价值．
- 长疲劳裂纹 /
- 门槛值 /
- 循环应力比 /
- 断裂韧度 /
- 扩展模型
Abstract: By comparison of the characteristics of existing models for long fatigue crack propagation rates, a new model called generalized passivation-lancet model for long fatigue crack propagation rates (GPLFCPR) and the general formula for characterizing the process of crack growth rates were put forward based on the deduction of passivation-lancet theory. The GPLFCPR model overcomes the disadvantages of the existing models and could describe the rules of whole fatigue crack growth process from the cracking threshold to the critical fracturing point effectively with explicit physical meaning and also reflects the influence of material characteristics, such as strength parameters, fracture parameters and heat treatment, etc. Experimental results, testing with LZ50 stell, AlZnMgCu 0.5, 0.5Cr 0.5Mo 0.25V steel and so on, are used to verify the new model, which show great consistency. The GPLFCPR model owns much value for theoretical research and practical applications.
- long fatigue crack /
- threshold /
- cyclic stress ratio /
- fracture roughness /
- propagation model

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参考文献(16)

[1]	Chiewanichakorn M,Aref A J,Alampalli S. Dynamic and fatigue response of a truss bridge with fiber reinforced polymer deck[J].International Journal of Fatigue,2007,29(8):1475-1489. doi: 10.1016/j.ijfatigue.2006.10.031
[2]	Wang B,Siegmund T.A numerical analysis of constraint effects in fatigue crack growth by use of an irreversible cohesive zone model[J].International Journal of Fracture,2005,132(2):175-196. doi: 10.1007/s10704-005-0627-1
[3]	Patankar R,Qu R.Validation of the state-space model of fatigue crack growth in ductile alloys under variable-amplitude load via comparison of the crack-opening stress data[J].International Journal of Fracture,2005,131(4):337-349. doi: 10.1007/s10704-004-4729-y
[4]	Paris P,Erdogan F.A critical analysis of crack growth laws[J].J Basic Eng,1963,85(3):528-534. doi: 10.1115/1.3656900
[5]	Forman R G,Kearney V E,Engle R M.Numerical analysis of crack propagation in cyclic-loaded structure[J].J Basic Eng,1967,89(3):459-464. doi: 10.1115/1.3609637
[6]	Elber W.The significance of fatigue crack closure[A].In: Damage Tolerate in Aircraft Structures[C].ASTM STP486,Philadophia: American Society for Testing and Material, 1971,230-242.
[7]	Richards C E,Lindley T C.The influence of stress intensity and microstructure on fatigue crack propagation in ferritic matericals[J].Eng Fract Mech,1972,4(7):951-978. doi: 10.1016/0013-7944(72)90028-8
[8]	赵永翔,何朝明,杨冰,等.LZ50车轴钢疲劳长裂纹扩展的概率模型[J].应用数学和力学,2005,26(8):997-1002.
[9]	赵永翔,杨冰,张卫华.一种疲劳长裂纹扩展率新模型[J].机械工程学报,2006,42(11):120-124.
[10]	Ekwaro-Osire S,Khandaker M P H,Gautam K,et al.Effect of reference loading and crack configuration on the stress intensity factors in weight function method[J].International Journal of Fracture,2006,139(3/4):553-560. doi: 10.1007/s10704-006-0103-6
[11]	张平生,胡志忠,蔡和平,等.一种疲劳裂纹扩展速率da/dN的表达式[J].西安交通大学学报,1982,16(1):33-42.
[12]	杨冰,赵永翔,梁红琴,等.基于Elber型方程的随机疲劳长裂纹扩展概率模型[J].工程力学,2005,22(5):99-104.
[13]	Paris P C,Bucei R J,Wessel E T,et al.Extensive study of low fatigue crack growth rates in A533 and A508 steel[A].In:Stress Analysis and Growth of Cracks, Proceedings of the 1971 National Symposium on Fracture Mechanics—Part 1[C].ASTM,STP,513.ASTM International,1972,141-176.
[14]	Morais A B,Pereira A B.Interlaminar fracture of multidirectional glass/eproxy laminates under mixed-mode Ⅰ+Ⅱ loading[J].Mechanics of Composite Materials,2007,43(3):233-244. doi: 10.1007/s11029-007-0023-1
[15]	Martin V,Jaffre J,Roberts J E.Modeling fractures and barriers as interfaces for flow in porous media[J].SIAM J Sci Comput,2005,26(5):1667-1691. doi: 10.1137/S1064827503429363
[16]	Savruk M P,Osechko M P,Panasyuk V E.Deformation fracture criterion for bodies with v-notches under the conditions of longitudinal shear[J].Material Science,2007,43(1):46-52. doi: 10.1007/s11003-007-0004-5