Combined effect of cylindricity, roundness and roughness on axial load-carrying ability of interference fits

Raj, Arun P.; Bhatti, Ankush; Dhanish, P.B.

doi:10.1177/1350650120919883

Cited by 5 publications

(1 citation statement)

References 26 publications

(35 reference statements)

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“…As mentioned above, practical research problems play a vital role in this distinct scientific field. Generally, the studies revolve around the factors affecting the interference fit load capability, such as the coefficient of friction [6][7][8], contact surface condition [9,10], geometrical figures [11][12][13], coupling materials properties, loading condition [14], working environment, and assembly procedure.…”

Section: Engineeringmentioning

confidence: 99%

Study of interference fit between steel and brass parts

Loc

2022

Eureka: PE

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Interference fits are generally used in mechanical systems because they have low-cost production and their assembly parts are much smaller than other mechanical joints. Also, their geometric shapes and material properties allow technicians to actively determine how strong the fits are. In this study, let’s present research on interference fits between steel and brass assembly parts. The experimental processes were accomplished with five pairs of specimens to evaluate the behaviours of surface asperities under a high loading condition. Specifically, the specimen pair includes a C45 steel shaft and a C2680 brass hub, which have different surface roughness values (Ra). Let’s apply high-precision methods in measuring all dimensional parameters and employed axial load tests for distinctively inspecting the steel-brass interference fit performance. In every experiment, the measured responses are: 1) the surface roughness values (Ra) before and after loading cycles; 2) the axial load (Fa); 3) the relative displacement value or the real-time interface length in loading stages (l). The aim of this study is to propose a new relative interference value specifically between steel and brass assembly parts, which can help determine the interference loss value more accurately. It was not concluded that with the relative interference of 2.25 ‰ the load capability of steel-brass interference fits is extended. Besides, let’s narrow down the predictive loss coefficient (a) for steel-brass interference assemblies ranging from 1.1 to 2.1, which varies from widely used standards considering a=3. This result helps minimize inaccuracies in interference fit designs, calculations, and work capabilities.

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Section: Engineeringmentioning

confidence: 99%

Study of interference fit between steel and brass parts

Loc

2022

Eureka: PE

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Influence of Surface Roughness on Press Fits

Persson

2022

Tribol Lett

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A press fit, also known as interference fit or friction fit, is a form of fastening between two tight fitting mating parts (usually two bodies with cylinder or conical surfaces) that produces a joint which is held together by friction after the parts are pushed together. I discuss the influence of surface roughness on the design of press fits. This topic has been addressed in the engineering community but only on an empirical level without a scientific backup. Here, I will apply the Persson contact mechanics theory to show how to include the surface roughness in the design criteria. I argue that one should use what I denote as the cylinder “stylus width” rather than the “caliper width” when determining the influence of the surface roughness of the compression (also denoted as the interference). In the classical approach using the caliper width, the compression is assumed to be independent of the elastic properties of the solids, but in the more accurate approach presented here using the stylus width the compression depends on the elastic properties and on the surface roughness power spectra of the involved solids. A detailed discussion of the relation between the root-mean-square roughness amplitude $$h_{\mathrm{rms}}$$ h rms and the maximum asperity height $$h_{\mathrm{max}}$$ h max , of interest in its own right, is also presented as it is needed for determining the relation between the stylus and caliper derived compression’s. Graphical Abstract

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Numerical and Experimental Studies on the Load Characteristics of Geometric Interference of Steel-Aluminum Knurled Interference Fit

Chen

et al. 2022

Metals

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This research studied the knurled interference fits (KIF) jointing process, which involves connection via a shaft and hub. KIF are widely used in many industries and products, but the related research is limited, especially in the case of auto parts. To confirm the optimal parameters for KIF joining, two different simulations in the finite element method (FEM), two hub thicknesses, three geometry versions, and four coefficients of friction (COF) were adopted to simulate the KIF forming process in this study. All the parameters were investigated in detail and accurately referred to experimental examination outcomes. The simulations and the experimental results offered explicit explanations of the relationship between jointing force and geometry dimensions. The hub-forming shape and the simulation of hoop deformation were analyzed, and the analysis results provide useful suggestions for other related industrial research as well.

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Combined effect of cylindricity, roundness and roughness on axial load-carrying ability of interference fits

Cited by 5 publications

References 26 publications

Study of interference fit between steel and brass parts

Study of interference fit between steel and brass parts

Influence of Surface Roughness on Press Fits

Numerical and Experimental Studies on the Load Characteristics of Geometric Interference of Steel-Aluminum Knurled Interference Fit

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