ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of Interference-fit on Load Amplitude of a Single Central Holed Tensile Plate
Received date: 2013-07-30
Revised date: 2013-09-06
Online published: 2013-09-11
Supported by
Advanced Project of a Specific Type of Fighter
To study the mechanism of the load amplitude reduction in smallest cross section (SCS) of an interference-fit connection, a spring analytical model of interference-fit pinned joint is developed by means of partitioning the pin and the plate and substituting each section with a spring of equal stiffness. The reason why the load amplitude in interference-fit connection is reduced is elaborated by using the spring model. The dependency of the resultant in the SCS the joint on external static load is investigated, and the relationship between the load amplitude in SCS and that of external cyclic load is also obtained, the discrepancy between which and the results of a finite element analysis (FEA) model is less than 20%. Analytical result reveals that the key to the loss in load amplitude lies in the contact pressure between the pin and the plate, and interference with a certain magnitude works only when the magnitude of external load is under a certain value. When external loading is in the effective range of the interference-fit, the load amplitude in cross section would be reduced to what extent is totally determined by the relative stiffness of the components of the joint. Over loading that initiates the separation of the pin and the plate, invalidates the effect of interference in terms of reducing load amplitude, and further gives rise to fretting fatigue of the contacting interface.
Key words： interference-fit; support effect; fatigue; spring model; load amplitude; pin connection
ZHANG Qiliang , CAO Zengqiang , GAN Xuedong , ZHAO Yong . Effect of Interference-fit on Load Amplitude of a Single Central Holed Tensile Plate[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1643 -1650 . DOI: 10.7527/S1000-6893.2013.0381
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