Abstract:Fretting fatigue is a mechanical failure process, which consists of two complex failure mechanisms. Fretting is caused by small relative movement between connected parts and fatigue is due to alternating bulk load. Fretting fatigue is highly non-linear and subjected to non-proportional loading condition. The multiaxial nature of stress at contact interface can be highly influenced by different phase difference between axial, tangential and contact load. In this study, the effect of different phase difference b… Show more
“…Finite element simulation of the fretting wear process of the cylinder-on-flat configuration on a fretting wear tester is implemented, as shown in Figure 2. The simulation experiment was carried out by using the two-dimensional cylinder-on-flat contact model 22,29 established in ABAQUS. Figure 1.Flowchart of fretting wear numerical simulation.Figure 2.Fretting wear test method.…”
Section: Numerical Simulation Of Experimentsmentioning
confidence: 99%
“…However, most of the previous fretting experiments and finite element simulations have been performed under the condition of a single tangential load applied on the joints, without considering the application of two or more kinds of tangential loads. Hojjati-Talemi et al 21,22 carried out the fretting test on Al 2024-T3 and designed the finite element simulation to study the influence of phase difference between two tangential loads on the initial crack initiation of fretting fatigue. Bhatti and Wahab 23,24 established a two-dimensional cylinder-on-flat contact model, where the influence of phase difference on the crack initial position and life of fretting fatigue was studied by finite element simulation.…”
Fretting wear is a major form of fretting damage involving various factors, such as material properties, surface roughness, surface topography, lubrication conditions, environment temperature, type of loading, and loading phase difference. In this study, ABAQUS is used to establish three models to simulate the variation of wear depth with the amplitude of additional load. The influence of the phase difference between additional load and original load is considered. Four phase difference angles are involved, i.e. 0°, 90°, 180°, and 270°. Results indicate that the rule of the variation of wear depth with the additional load amplitude increasing varies under different phase differences. It is observed that for the 0° phase difference, the wear depth firstly decreases then increases with the increase of the additional load. However, the wear depth increases monotonously in the case of the 180° phase difference. The variation of wear depth with additional load amplitude for 90° phase difference is similar to that of the 270° phase difference. The depth of wear is firstly kept at a relatively low level and then increases sharply, with the increase of the additional load. It is found that the distribution of shear stress and relative slip at the contact interface is also affected by the phase difference.
“…Finite element simulation of the fretting wear process of the cylinder-on-flat configuration on a fretting wear tester is implemented, as shown in Figure 2. The simulation experiment was carried out by using the two-dimensional cylinder-on-flat contact model 22,29 established in ABAQUS. Figure 1.Flowchart of fretting wear numerical simulation.Figure 2.Fretting wear test method.…”
Section: Numerical Simulation Of Experimentsmentioning
confidence: 99%
“…However, most of the previous fretting experiments and finite element simulations have been performed under the condition of a single tangential load applied on the joints, without considering the application of two or more kinds of tangential loads. Hojjati-Talemi et al 21,22 carried out the fretting test on Al 2024-T3 and designed the finite element simulation to study the influence of phase difference between two tangential loads on the initial crack initiation of fretting fatigue. Bhatti and Wahab 23,24 established a two-dimensional cylinder-on-flat contact model, where the influence of phase difference on the crack initial position and life of fretting fatigue was studied by finite element simulation.…”
Fretting wear is a major form of fretting damage involving various factors, such as material properties, surface roughness, surface topography, lubrication conditions, environment temperature, type of loading, and loading phase difference. In this study, ABAQUS is used to establish three models to simulate the variation of wear depth with the amplitude of additional load. The influence of the phase difference between additional load and original load is considered. Four phase difference angles are involved, i.e. 0°, 90°, 180°, and 270°. Results indicate that the rule of the variation of wear depth with the additional load amplitude increasing varies under different phase differences. It is observed that for the 0° phase difference, the wear depth firstly decreases then increases with the increase of the additional load. However, the wear depth increases monotonously in the case of the 180° phase difference. The variation of wear depth with additional load amplitude for 90° phase difference is similar to that of the 270° phase difference. The depth of wear is firstly kept at a relatively low level and then increases sharply, with the increase of the additional load. It is found that the distribution of shear stress and relative slip at the contact interface is also affected by the phase difference.
“…As shown in Figure 5, a two-dimensional cylinder-on-flat contact model of fretting wear is established in ABAQUS. 27,28 The input geometric and material parameters in the simulations were extracted directly from the model used by literature 3 and are: elastic modulus E = 200 GPa, Poisson's ratio v = 0.3, the radius of cylinder R = 5 mm, the length and width of specimen 10 mm × 5 mm. In addition, the bottom of the lower test piece is fully constrained and the top surface of the cylindrical specimen is subjected by the multipoint restraint (MPC).…”
Section: Finite Element Simulation Modelmentioning
Fretting wear is a kind of material damage in contact surfaces caused by microrelative displacement between two bodies. It can change the profile of contact surfaces, resulting in loosening of fasteners or fatigue cracks. Finite element method is an effective method to simulate the evolution of fretting wear process. In most studies of fretting wear, the coefficient of friction was assumed to be constant to simplify model and reduce the difficulty of solving. However, fretting wear test showed that the coefficient of friction was a variable related to the number of fretting cycles. Therefore, this paper introduces the coefficient of friction as a function of the number of fretting cycles in numerical simulation. A wear model considering variable coefficient of friction is established by combining energy consumption model and adaptive grid technique. The nodes of contact surfaces are updated through the UMESHMOTION subroutine. The effects of constant coefficient of friction and variable coefficient of friction on fretting wear are analyzed by comparing the wear amount under different loading conditions. The results show that when compared with coefficient of friction model, fretting wear is obviously affected by variable coefficient of friction and the variable coefficient of friction model has a larger wear volume when the fretting is in partial slip condition and mixed slip condition. In gross slip condition, the difference of wear volume between variable coefficient of friction model and coefficient of friction model decreases with the increase in the displacement amplitudes.
“…Fretting fatigue may reduce the lifetime of a component by half or even more, in comparison to plain fatigue [6]. This reduction is due to a complex multiaxial and non-proportional stress state which occurs at a contact interface under partial slip loading conditions [7][8][9][10]. Therefore, it is very important to understand the underlying failure mechanism.…”
Many structural applications are aiming for weight reduction by using high strength steel. In a lug joint the load is transmitted by a pin, which leads to a pressure distribution on the hole in the lug. When a lug joint is subjected to axial cyclic loading conditions, the stress distribution becomes multiaxial, i.e. a combination of normal and tangential stresses. In such loading case, a fretting crack initiates at the contact interface between the pin/lug connection which is followed by a fatigue crack propagation up to the final rupture of the lug. In this study, the fretting fatigue crack initiation and propagation in a pin/lug joint are simulated using multiaxial fatigue criterion and fracture mechanics, respectively. To do so, first a 2D finite element model is developed for obtaining stresses and strains at the contact interface in a pin/lug joint. Using the extracted data, fretting fatigue failure parameters are analysed. Next, the obtained stresses and strains are used to estimate the crack initiation lifetime using a fatigue multiaxial critical plane model. A 3D model is set-up to simulate the crack propagation using eXtended Finite Element Method (XFEM). Eventually, the predicted total fatigue lifetimes are compared against experimental observations taken from literature.
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