Estimation of the Normal Contact Stiffness for Frictional Interface in Sticking and Sliding Conditions

Tonazzi, Davide; Massi, Francesco; Salipante, Mario; Baillet, Laurent; Berthier, Yves

doi:10.3390/lubricants7070056

Cited by 19 publications

(12 citation statements)

References 45 publications

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“…The nonlinear response of an experimental test bench (Figure 1) to an impulsive force is then modelled in a one-dimensional framework, including two rough contact interfaces with nonlinear contact stiffness. The tested contact stiffness laws are first identified over a large contact pressure range, using both the experimental tests and results from the literature [15,18,28]. However, there is a lack, both experimentally and from the literature, of assessments of the stiffness trend within the lower pressure range (less than 0.14 MPa).…”

Section: Description Of the Approachmentioning

confidence: 99%

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Numerical and Experimental Analysis of Nonlinear Vibrational Response due to Pressure-Dependent Interface Stiffness

et al. 2020

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Modelling interface interaction with wave propagation in a medium is a fundamental requirement for several types of application, such as structural diagnostic and quality control. In order to study the influence of a pressure-dependent interface stiffness on the nonlinear response of contact interfaces, two nonlinear contact laws are investigated. The study consists of a complementary numerical and experimental analysis of nonlinear vibrational responses due to the contact interface. The laws investigated here are based on an interface stiffness model, where the stiffness property is described as a nonlinear function of the nominal contact pressure. The results obtained by the proposed laws are compared with experimental results. The nonlinearity introduced by the interface is highlighted by analysing the second harmonic contribution and the vibrational time response. The analysis emphasizes the dependence of the system response, i.e., fundamental and second harmonic amplitudes and frequencies, on the contact parameters and in particular on contact stiffness. The study shows that the stiffness–pressure trend at lower pressures has a major effect on the nonlinear response of systems with contact interfaces.

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Section: Description Of the Approachmentioning

confidence: 99%

“…However, the development of increasingly sophisticated numerical models with contact interfaces means that more reliable and fine contact parameters need to be defined. Contact stiffness has been proved to be sensitive to contact conditions such as contact pressure [15][16][17], third body rheology [18] and the true area of contact [19].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of Nonlinear Vibrational Response due to Pressure-Dependent Interface Stiffness

et al. 2020

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“…In this paper, an alternative method by using FRF and FEA is proposed to identify the contact stiffness for the floating caliper disc brake shown in Figure 3. The flow diagram of the identification procedure is illustrated in Figure 4 [19][20][21]. To ensure the finite element (FE) model accuracy of the disc brake, the FRF of the brake disc as well as that of the pad under free-free boundary condition was first measured by using hammer impact testing.…”

Section: Identification Of the Contact Stiffness Of A Floating Caliper Disc Brakementioning

confidence: 99%

Identification of Contact Stiffness between Brake Disc and Brake Pads Using Modal Frequency Analysis

Ding

Zhu

Lyu

2020

J. Eng. Technol. Sci.

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Contact stiffness increases with brake pressure, which leads to an increase of the mode frequency of the brake disc. As the disc mode order increases, the contact stiffness first increases and then almost stays invariant, which makes a mode frequency change correspondingly. The dependence of contact stiffness on brake pressure and disc mode order could be one of the possible reasons why the current research on prediction of brake noise and vibration is inaccurate and unsatisfactory.

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“…One of the phenomena at the origins of such noises are stick-slip [20]. The appearance of stick-slip instability is influenced by the combination of several tribological and dynamical processes and parameters [21,22], which in real systems are difficult to discern. One cause of instability is a falling characteristic of the friction coefficient with the relative velocity that may lead to negative damping, causing stick-slip oscillations [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis of the bi-stable state for frictional continuous system

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Unstable friction-induced vibrations are considered an annoying problem in several fields of engineering. Although several theoretical analyses have suggested that friction-excited dynamical systems may experience sub-critical bifurcations, and show multiple coexisting stable solutions, these phenomena need to be proved experimentally and on continuous systems. The present work aims to partially fill this gap. The dynamical response of a continuous system subjected to frictional excitation is investigated. The frictional system is constituted of a 3D printed oscillator, obtained by additive manufacturing that slides against a disc rotating at a prescribed velocity. Both a finite element model and an experimental setup has been developed. It is shown both numerically and experimentally that in a certain range of the imposed sliding velocity the oscillator has two stable states, i.e. steady sliding and stick–slip oscillations. Furthermore, it is possible to jump from one state to the other by introducing an external perturbation. A parametric analysis is also presented, with respect to the main parameters influencing the nonlinear dynamic response, to determine the interval of sliding velocity where the oscillator presents the two stable solutions, i.e. steady sliding and stick–slip limit cycle.

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Estimation of the Normal Contact Stiffness for Frictional Interface in Sticking and Sliding Conditions

Cited by 19 publications

References 45 publications

Numerical and Experimental Analysis of Nonlinear Vibrational Response due to Pressure-Dependent Interface Stiffness

Numerical and Experimental Analysis of Nonlinear Vibrational Response due to Pressure-Dependent Interface Stiffness

Identification of Contact Stiffness between Brake Disc and Brake Pads Using Modal Frequency Analysis

Numerical and experimental analysis of the bi-stable state for frictional continuous system

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