Numerical simulation of surface pitting due to contact loading

Flašker, Jože

doi:10.1016/s0142-1123(01)00020-2

Cited by 44 publications

(33 citation statements)

References 11 publications

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“…This avoids the need to use special algorithms for simulation of the actual contact state, which are not so generally available. The stress distribution under the contact area is fully consistent with the Hertzian analytical results and those obtained using the special contact elements and appropriate solution algorithms [6,7]. This leads to the conclusion that using the equivalent contact model shown in Fig.…”

Section: Real Contactsupporting

confidence: 82%

Computational fatigue analysis of contacting mechanical elements

Fajdiga

2015

Teh. vjesn.

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Original scientific paper The paper investigates the influence of different parameters on stress distribution in the contact area of mechanical elements. The study is aimed to determine particular positions in the contacting bodies, where small crack should be initiated due to large stresses resulting from different contact conditions. A two-dimensional equivalent contact model together with Hertzian contact theory is used for all computational analyses utilising the finite element method. The distribution of the maximum equivalent von Mises stress under the contacting area is first determined for pure Hertzian contact conditions, where the maximum stresses appear at a certain depth under the contacting surface. Then a parametric study to determine the influence of loading, contact surface curvature, contact friction, residual stresses and elasto-hydro-dynamic lubrication on the stress distribution is performed. They tend to increase the stresses and move their maximum to or very close to the contacting surface, which can lead to sub-surface or surface crack initiation. In this study the surface crack initiation and propagation on the gear teeth flank is presented. The virtual crack extension (VCE) method, implemented in the finite element method, is used for simulating the fatigue crack propagation from the initial crack up to the formation of the surface pit. Comparison between the results of the numerical simulation and the results of experimental testing shows good correlation. Keywords: contact problems; crack initiation; crack propagation; machine elements; numerical analysis; tribology Računarska analiza zamora mehaničkih elemenata u dodiruIzvorni znanstveni članak U radu se ispituje utjecaj različitih parametara na raspodjelu naprezanja u dodirnoj površini mehaničkih elemenata. Cilj je rada odrediti konkretna mjesta u dodirnim tijelima gdje bi se trebale pojaviti male pukotine zbog velikih naprezanja nastalih različitim uvjetima dodira. Dvodimenzionalni ekvivalentni kontaktni model zajedno s Hertzovom teorijom dodira upotrebljen je za sve računarske analize primjenom metode konačnih elemenata. Raspodjela maksimalnog ekvivalentnog von Mises naprezanja na dodirnoj površini najprije je određena za prave Hertzove uvjete dodira, gdje se maksimalna naprezanja javljaju na određenoj dubini ispod površine dodira. Tada je parametrijskom analizom određen utjecaj opterećenja, zakrivljenosti površine dodira, dodirnog trenja, zaostalih naprezanja i elasto-hidro-dinamičkog podmazivanja na raspodjelu naprezanja. Sve to nastoji povećati naprezanja i maksimalno se razviti uz ili vrlo blizu dodirne površine, što može dovesti do iniciranja pukotine ispod površine ili na njoj. U ovom se radu predstavlja nastajanje pukotine na površini i njezino širenje na bočnoj površini zubi zupčanika. Metoda Virtual crack extension (VCE) (virtualno širenje pukotine), implementirana u metodi konačnih elemenata, primijenjena je za simuliranje širenja pukotina zbog zamora materijala od začetka pukotine do stvaranja šupljina na površini. Uspor...

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Section: Real Contactsupporting

confidence: 82%

Computational fatigue analysis of contacting mechanical elements

Fajdiga

2015

Teh. vjesn.

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“…The material of gear is 45# steel, its parameters shown in Table 2. Rotation speed 1 n is 100r/min and transmission power P is 5.6kw. According to gear engagement curve formulas [16], the exact position coordinates of the points on tooth profile are solved in MATLAB (see Figure 5) and written into a full text date file.…”

Section: Polymorphous Modeling Of Gear Drivementioning

confidence: 99%

“…Studies have shown that [1][2][3][4][5], the tooth surface friction contribute to the formation of pitting, tooth root crack initiation and extension, and increase effect of tooth fracture. Due to tooth surface friction, the formation of pitting, tooth root crack initiation and extension and tooth fracture are intensified.…”

Section: Introductionmentioning

confidence: 99%

A quantitative calculation approach research of tooth surface friction characteristic parameters

2016

MATEC Web of Conferences

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Abstract:A new calculation approach of tooth surface friction characteristic parameters is raised in this paper, the caclulation approach is based on gear drive test experience and finite element multi field coupling analysis method and technology.In the process of solution, friction characteristic concept of engineering oriented complex gear drive is raised, "experiment-calculation composite model" is built, tooth surface friction characteristic parameters(friction coefficients) are inversely analyzed by the composite model under different lubrication conditions. The problem of complicated tooth friction coefficients is solved. The calculation method is a new idea on solving friction characteristic parameters under complex lubrication conditions, it unites theoretical research, system modeling, numerical simulation and experimental test, so its solution is more reasonable. Exactly research friction coefficients can help to search gear friction principle and to upgrade the level of decrease noise and vibration of gear.

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“…The energy release method using J integral is based on the assumption that, in the LEML area, the energy release G can be equalized with J integral [16]. Into this method, it is possible to integrate the VCE method [12,17,18], which can be used to calculate the deformation energy release, on the basis of which the stress intensity factor can be calculated.…”

Section: Introductionmentioning

confidence: 99%

Determining stress intensity factor KI with extrapolation method

Zafošnik

Fajdiga

2016

Teh. vjesn.

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Original scientific paper In this article it is presented how to determine stress intensity factor from stress, using the extrapolation method for crack opening mode I. The simplicity of the extrapolation method is its advantage; basically, no special algorithms for calculating stress intensity factor are required. Stresses are determined with the finite element method; in relation to that the impact that the observance of the position of the integration point has on the preciseness of the calculated stress intensity factor and stress evaluation in the nodes of finite elements is analysed. The impact of using different trend polynomial functions, the size of finite elements and the number of points used for creating trend functions are analysed to find out the suitability of this method for determining the stress intensity factor KI. Keywords: extrapolation method; finite element analysis; fracture mechanics; semi-infinite plate; stress intensity factor Određivanje koeficijenta intenziteta naprezanja KI metodom ekstrapolacijeIzvorni znanstveni članak U radu je pokazano kako iz naprezanja odrediti koeficijent intenziteta naprezanja primjenom metode ekstrapolacije za način stvaranja pukotine I. Jednostavnost metode ekstrapolacije je njena prednost; u biti, nisu potrebni posebni algoritmi za računanje koeficijenta intenziteta naprezanja. Naprezanja se određuju metodom konačnih elemenata; u odnosu na to analizira se učinak položaja točke integriranja na točnost izračunatog koeficijenta intenziteta naprezanja i proračuna naprezanja u čvorovima konačnih elemenata. Analizira se učinak primjene funkcije polinoma drugačijeg trenda, veličine konačnih elemenata i broja točaka upotrebljenih za stvaranje funkcija trenda kako bi se ustanovila prikladnost ove metode za određivanje koeficijenta intenziteta naprezanja KI.Ključne riječi: analiza konačnih elemenata; koeficijent intenziteta naprezanja; mehanika loma; metoda ekstrapolacije; ploča polu-beskonačnih dimenzija

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Numerical simulation of surface pitting due to contact loading

Cited by 44 publications

References 11 publications

Computational fatigue analysis of contacting mechanical elements

Computational fatigue analysis of contacting mechanical elements

A quantitative calculation approach research of tooth surface friction characteristic parameters

Determining stress intensity factor KI with extrapolation method

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