In view of the limitations of the traditional interference theory based on the supporting effect (SE), the spring model (SM) is introduced here to study the fatigue enhancing mechanism of interference, in the hope of obtaining a more comprehensive understanding of the interference strengthening technology and promoting its applications. The inadequacies of the SE theory are firstly analyzed, and a range of insoluble problems are discussed. Then, an introduction of the basic concepts and the analytical results of the SM are given. The mentioned problems are explained in terms of elastic deformation, and the analytical solution for the optimum amount of interference is derived. An analysis of the SM indicates that there exists an elasticity reinforcement mechanism in an interference-fitted joint, and the elastic deformation of member components subjected to alternating external applied load and the automatic regulating effect of contact are the reason for the reduction of the amplitude of load transferred by the connected members. It is also concluded that the sizes and materials of components, as well as actual loading conditions, should be taken into consideration in determining the optimum interference.
ZHANG Qiliang
,
CAO Zengqiang
,
LI Hongmei
,
XIANG Cong
,
LIU Ping
. Elastic fatigue enhancement mechanism of interference fit[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018
, 39(4)
: 421687
-421687
.
DOI: 10.7527/S1000-6893.2017.21687
[1] CHAKHERLOU T N, RAZAVI M J, AGHDAM A B, et al. An experimental investigation of the bolt clamping force and friction effect on the fatigue behavior of aluminum alloy 2024-T3 double shear lap joint[J]. Materials & Design, 2011, 32(8):4641-4649.
[2] WU T, ZHANG K F, CHENG H, et al. Analytical modeling for stress distribution around interference fit holes on pinned composite plates under tensile load[J]. Composites Part B:Engineering, 2016,100(1):176-185.
[3] MOHAMMADPOUR A, CHAKHERLOU T N. Numerical and experimental study of an interference fitted joint using a large deformation Chaboche type combined isotropic-Kinematic hardening law and mortar contact method[J]. International Journal of Mechanical Sciences, 2016, 106:297-318.
[4] MIRZAJANZADEH M, CHAKHERLOU T N, VOGWELL J. The effect of interference-fit on fretting fatigue crack initiation and ΔK of a single pinned plate in 7075 Al-alloy[J]. Engineering Fracture Mechanics, 2011, 78(6):1233-1246.
[5] CHAKHERLOU T N, TAGHIZADEH H, AGHDAM A B. Experimental and numerical comparison of cold expansion and interference fit methods in improving fatigue life of holed plate in double shear lap joints[J]. Aerospace Science and Technology, 2013, 29(1):351-362.
[6] LIU J, WU H, YANG J, et al. Effect of edge distance ratio on residual stresses induced by cold expansion and fatigue life of TC4 plates[J]. Engineering Fracture Mechanics, 2013,109(3):130-137.
[7] 左杨杰, 曹增强, 杨柳,等. 基于对称加载的均匀干涉配合铆接方法[J]. 航空学报, 2016, 37(3):1049-1059. ZUO Y J, CAO Z Q, YANG L, et al. Interference-fit evenness riveting method based on symmetrical loading[J]. Acta Aeronautica et Astronautica Sinica, 2016, 37(3):1049-1059(in Chinese).
[8] 姜杰凤, 董辉跃, 柯映林. 高锁螺栓干涉连接中极限干涉量[J]. 机械工程学报, 2013, 49(3):145-152. JIANG J F, DONG H Y, KE Y L. Maximum interference fit size of hi-lock bolted joints[J]. Chinese Journal of Mechanical Engineering, 2013, 49(3):145-152(in Chinese).
[9] CHAKHERLOU T N, ABAZADEH B. Investigating clamping force variations in Al2024-T3 interference fitted bolted joints under static and cyclic loading[J]. Materials & Design, 2012, 37:128-136.
[10] ABAZADEH B, CHAKHERLOU T N, ALDERLIESTEN R C. Effect of interference fitting and/or bolt clamping on the fatigue behavior of Al alloy 2024-T3 double shear lap joints in different cyclic load ranges[J]. International Journal of Mechanical Sciences, 2013, 72(7):2-12.
[11] TIMOSHENKO S P. Strength of materials part Ⅱ:Advanced theory and problems[M].3rd ed. 1956:205-213.
[12] HSU Y C, FORMAN R G. Elastic-plastic analysis of an infinite sheet having a circular hole under pressure[J]. Journal of Applied Mechanics, 1975, 42(2):347-352.
[13] GUO W L. Elastic-plastic analysis of a finite sheet with a cold-worked hole[J]. Engineering fracture mechanics, 1993, 46(3):465-472.
[14] 郭兰中, 朱琪, 邢文珍. 过盈压入强化预应力及其变化规律的研究[J]. 应用力学学报, 2002, 19(1):27-31. GUO L Z, ZHU Q, XING W Z. Prestressing of force-fit and its characters under load[J]. Chinese Journal of Applied Mechanics, 2002, 19(1):27-31(in Chinese).
[15] KIM S Y, HE B, SHIM C S, et al. An experimental and numerical study on the interference-fit pin installation process for cross-ply glass fiber reinforced plastics (GFRP)[J]. Composites Part B:Engineering, 2013, 54:153-162.
[16] LANCIOTTI A, POLESE C. The effect of interference-Fit fasteners on the fatigue life of central hole specimens[J]. Fatigue & Fracture of Engineering Materials & Structures, 2005, 28(7):587-597.
[17] HAO D, WANG D. Finite-element modeling of the failure of interference-fit planet carrier and shaft assembly[J]. Engineering Failure Analysis, 2013, 33(7):184-196.
[18] 张岐良, 曹增强, 甘学东, 等. 拉伸板中心孔干涉配合对载荷幅值的影响[J]. 航空学报, 2014, 35(6):1643-1650. ZHANG Q L, CAO Z Q, GAN X D, et al. Effect of interference-fit on load amplitude of a single central holed tensile plate[J]. Acta Aeronautica et Astronautica Sinica, 2014, 35(6):1643-1650(in Chinese).
[19] ZHANG Q L, CAO Z Q, WEI FY, et al. Mechanical analysis of a pin interference-fitted sheet under tensile loading[J]. Journal of Aerospace Engineering, 2016, 29(4):04015085.
[20] 中国航空科学技术研究院. 飞机结构抗疲劳断裂强化设计手册[M]. 北京:航空工业出版社, 1993. Chinese Academy of Aviation Science and Technology. Handbook of aircraft structure anti-fatigue and anti-fracture strengthen technology[M]. Beijing:Aviation Industry Press, 1993(in Chinese).
[21] BROWN M A, EVANS J L. Fatigue life variability due to variations in interference fit of steel bushings in 7075-T651 aluminum lugs[J]. International Journal of Fatigue, 2012, 44(9):177-187.
[22] CHAKHERLOU T N, MIRZAJANZADEH M, VOGWELL J. Experimental and numerical investigations into the effect of an interference fit on the fatigue life of double shear lap joints[J]. Engineering Failure Analysis, 2009, 16(7):2066-2080.
[23] CROCCOLO D, DE A M, CESCHINI L, et al. Interference fit effect on improving fatigue life of a holed single plate[J]. Fatigue & Fracture of Engineering Materials & Structures, 2013, 36(7):689-698.
[24] 郝小忠, 王珉, 陈文亮. 自动钻铆最佳干涉量试验研究[J]. 航空制造技术, 2012(12):77-79. HAO X Z, WANG M, CHEN W L. Experimental research of best interference fit level on automatic drilling and riveting[J]. Aeronautical Manufacturing Technology, 2012(12):77-79(in Chinese).
CJA