On the dynamics of the friction coefficient

Ostermeyer, Georg‐Peter

doi:10.1016/s0043-1648(03)00235-7

Cited by 177 publications

(131 citation statements)

References 5 publications

Supporting

Mentioning

118

Contrasting

Unclassified

Order By: Relevance

“…For example, they have advanced the understanding of the influence of "patch dynamics" on the tribological behavior of high-load tribological contacts. They have also developed dynamic models of the coefficient of friction, which are capable of accurately representing complex behavior using simple mathematics [1]. They have developed various cellular automata towards the precise computation of tribological effects in a realistic 3-D model of a friction material mixture, and also towards efficiently simulating the tribological contact between a full-scale brake pad and disc [2].…”

Section: Methodsmentioning

confidence: 99%

Multiphysics of Tribocontacts

Ostermeyer

Bräuer

Merlis

et al. 2017

Proc Appl Math and Mech

View full text Add to dashboard Cite

The complex processes involved in the dry friction between two bodies are not yet fully understood. Towards an improved understanding of the associated tribological phenomena, the authors combine their skills and expertise in the respective fields of tribological experimentation, modeling, and simulation, as well as topological and chemical surface analyses. The aim of this research is more accurate predictions of the tribological behavior of minimal friction material mixtures. In order to improve the technical understanding of high-load tribological contacts (in which wear debris significantly influences the contact situation), a great volume and variety of research is necessary. The authors have devised a "vertically integrated" research approach towards addressing the myriad interdependent phenomena associated with such investigations. MethodsThe authors at the Institute of Dynamics and Vibrations have made several contributions towards the understanding of highload tribological contacts. For example, they have advanced the understanding of the influence of "patch dynamics" on the tribological behavior of high-load tribological contacts. They have also developed dynamic models of the coefficient of friction, which are capable of accurately representing complex behavior using simple mathematics [1]. They have developed various cellular automata towards the precise computation of tribological effects in a realistic 3-D model of a friction material mixture, and also towards efficiently simulating the tribological contact between a full-scale brake pad and disc [2].Multiple tribometers have been developed at the Institute of Dynamics and Vibrations which are capable of investigating high-load tribological contacts. These devices precisely measure the input and reaction forces very close to the tribological contact. Many other quantities are also measured, such as the temperatures of the two friction bodies, acoustic signals, and environmental conditions. An example of resulting friction and temperature measurements is shown in Figure 1. Furthermore, one of the tribometers is equipped with a built-in topography measurement station. Using this, quasi in situ photographs and measurements of the friction material's topography can be automatically made throughout the measurement procedure [3].The Institute of Surface Technology has performed various types of investigations into tribological systems, with a focus on surface technology and tribochemistry. They have developed methods for actively adjusting the friction and wear behavior of tribological contacts through the use of various coatings and thermal treatments, and analyzed the results based on the chemical composition of the associated surfaces [4]. By optimizing plasma nitriding treatments, they have improved the wear resistance of mechanical parts under tribological loads [5]. Recently, this institute has developed methods for optimizing chemical analyses of friction materials, particularly at the tribological boundary layer. As shown in Figure 2, this involv...

show abstract

Section: Methodsmentioning

confidence: 99%

Multiphysics of Tribocontacts

Ostermeyer

Bräuer

Merlis

et al. 2017

Proc Appl Math and Mech

View full text Add to dashboard Cite

show abstract

“…U ovom radu, osobine veštačkih neuronskih mreža da uspostave funkcionalnu zavisnost između ulaznih i izlaznih parametara su iskorišćene za predviđanje istrošenja frikcionog materijala u odnosu na uticaj navedenih faktora. Istraživanja u [13] se odnose na glavni mehanizam habanja kod disk kočnica, pri čemu je predstavljen dinamički model koeficijenta trenja, gde su i trenje i habanje uzeti u obzir. Ovaj model objašnjava mnogo otvorenih pitanja o principu funkcionisanja kočnih sistema.…”

Section: P Pr Re Eg Gl Le Ed D Sunclassified

“…Ovaj model objašnjava mnogo otvorenih pitanja o principu funkcionisanja kočnih sistema. Dinamički model koji je razvijen prema [13] opisuje dinamičko ponašanje koeficijenta trenja i njegovu zavisnost od temperature u frikcionom sloju. Takođe su detaljno objašnjeni efekat fedinga (pada performansi usled dejstva visoke temperature), kao i složena zavisnost koeficijenta trenja od brzine klizanja.…”

Section: P Pr Re Eg Gl Le Ed D Sunclassified

“…Koeficijent trenja predstavlja odnos između sile trenja i normalne sile (sile aktiviranja kočnice) i nije konstantna veličina usled složenosti uslova u kojima se odvija kontakt frikcionog para, pa su prema [10] zakoni njene promene, za posmatrane radne uslove, do danas ostali vrlo teško predvidivi. O složenosti triboloških procesa koji se dešavaju u kontaktu frikcionog para govori i činjenica da zakoni kojima bi se oni mogli opisati na molekularnom nivou pripadaju domenu mehanike, termodinamike i hemije [13,15,107]. Pored toga, kompleksnosti triboloških procesa u kontaktu doprinosi i to što su frikcioni materijali vrlo složeni kompoziti sa izraženo različitim osobinama sirovina od kojih su napravljeni [106,108,109].…”

Section: Slika 42 Disk Kočnica Kod Privrednih Vozilaunclassified

“…Tokom kočenja, kontakt se ostvaruje preko promenljivog broja kontaktnih površina [13,14]. Ovakva dinamički promenljiva interakcija između površina frikcionog para, u zavisnosti od radnih uslova kočnice, tj.…”

Section: Slika 45 Promena Veličine Kontaktnog Sloja Prema [106]unclassified

See 2 more Smart Citations