基于应力流概念的压差评价方法
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摘要
为解决承力框架结构的应力集中问题,采用应力流概念,在理论基础上对二维带孔平板结构进行仿真分析,得出应力值越大压差越大的结果,并在二维平板结构的基础上探索是否三维结构具有同样的结论。最后提出一种运用压差的方式对承力结构进行评价的方法,并运用此方法评价了改进后的活塞结构,从另一种角度为降低承力结构的应力集中现象提供了新的依据,扩展了解决问题的途径。
In order to solve the problem of stress concentration in bearing frame structure,the relationship between stress and pressure difference in a two-dimensional perforated plate was theoretically simulated using the stress-flow concept.The result shows that the larger the stress value is,the larger the pressure difference is.Then a three-dimensional structure was simulated to explore whether it has the same phenomena.Finally,a method to evaluate bearing structure by means of differential pressure was proposed based on the above analysis,and it was used to evaluate an improved piston structure.The result shows that the method provides a new basis for reducing stress concentration in bearing structure from another perspective and expands the solution to the problem.
In order to solve the problem of stress concentration in bearing frame structure,the relationship between stress and pressure difference in a two-dimensional perforated plate was theoretically simulated using the stress-flow concept.The result shows that the larger the stress value is,the larger the pressure difference is.Then a three-dimensional structure was simulated to explore whether it has the same phenomena.Finally,a method to evaluate bearing structure by means of differential pressure was proposed based on the above analysis,and it was used to evaluate an improved piston structure.The result shows that the method provides a new basis for reducing stress concentration in bearing structure from another perspective and expands the solution to the problem.
引文
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[16]刘一鸣.钛合金活塞耐磨性设计及铸造缺陷影响研究[D].北京:北京理工大学,2016.
[2]曲焱喆,盖秉政.多孔有限大弹性薄板弯曲应力集中问题[J].应用力学学报,2008,25(2):198-201.QU Y Z,GAI B Z.Stress concentration in bending lacunaris finite plate[J].Chinese Journal of Applied Mechanics,2008,25(2):198-201.
[3]LOUHGHALAM A,IGUSA T,PARK C,et al.Analysis of stress concentrations in plates with rectangular openings by a combined conformal mapping-finite element approach[J].International Journal of Solids and Structures,2011,48(13):1991-2004.
[4]YOUNIS N T.Assembly stress for the reduction of stress concentration[J].Mechanics Research Communications,2006,33:837-845.
[5]LOTFI T,MOUSSA K,BERNARD L.Stress concentration in a circular hole in composite plate[J].Composite Structures,2005,68:31-36.
[6]YANG R J,CHUANG C H.Optimal topology design using linear programming[J].Computers and Structures,1994,52(2):265-275.
[7]SCHUHMACHER G,STETTNER M,ZOTEMANTEL R.Optimization assisted structural design of a new military transport aircraft[C].10th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference.New York:Albany,2004:1-9.
[8]陈磊,金海波.基于传力路径的飞机加强框架结构优化方法研究[J].航空工程进展,2011,2(2):1-204.CHEN L,JIN H B.Research on structural optimization method for aircraft bulkhead based on the path of force transfer[J].Advances in Aeronautical Science and Engineering,2011,2(2):1-204.
[9]RONG J H,XIE Y M,YANG X Y.An improved method for evolutionary structural optimization against buckling[J].Computer and Structures,2001,79(3):256-263.
[10]何林伟,蔡国平.Von Mises应力约束的连续结构的一种双向拓扑优化方法[J].力学季刊,2011,32(1):19-27.HE L W,CAI G P.A bidirectional optimization method for continuous structures subject to Von Mises stress constraints[J].Chinese Quarterly of Mechanics,2011,32(1):19-27.
[11]斋藤公男(日).空间结构的发展与展望---空间结构设计的过去·现在·未来[M].季小莲,徐华,译.北京:中国建筑工业出版社,2006.
[12]HIROKAZU N,TOMOHITO O,KEISHI K.Study on the development of general-purpose genetic algorithm engine[A].Proceedings of the Fourth World Congress of Structural and Multidisciplinary Optimization[C].Dalian:State Key Laboratory of Structural Analysis for Industrial Equipment,Dalian University of Technology,2001:428-431.
[13]贺志启,刘钊.独柱式桥墩帽梁的力流线模型设计方法[J].桥梁建设,2013,43(5):106-110.HE Z Q,LIU Z.Design method for load path model of capping beam of single column pier[J].Bridge Construction,2013,43(5):106-110.
[14]胡海昌.弹性力学的变分原理及其应用[M].北京:科学出版社,1982.
[15]韩占忠,王国玉.工程流体力学基础[M].北京:北京理工大学出版社,2012.
[16]刘一鸣.钛合金活塞耐磨性设计及铸造缺陷影响研究[D].北京:北京理工大学,2016.