Increase In Friction Coefficient Research Articles

Peristaltic flow of bioconvective Ree–Eyring nanofluid through an inclined elastic channel with partial slip effects

Pharmaceutical fluid processing is a procedure of medication manufacturing, utilizing a particular kind of heat transfer in a biofluid designed to maintain the desired temperature for extended periods. Choosing a suitable fluid can have a positive effect on the operating efficacy of the system and lengthen the fluid’s and system’s life spans. As an outcome of this development, we investigate the influence of the partial slip and gyrotactic microorganisms on the peristaltic transport of a magnetohydrodynamic Ree–Eyring nanofluid via an aligned porous conduit with thermal radiation, energy generation, along with cross and double diffusion effects. By invoking suitable nondimensional parameters, the proposed dimensional governing equations are transformed into a system of dimensionless partial differential equations. The analytical solutions for the system of partial differential equations are obtained by incorporating the homotopy perturbation method. Further, tabular and graphical presentations are used to examine the characteristics of the various sundry parameters on the temperature, concentration, motile microorganism density, axial velocity, trapping, and other relevant flow quantities. The observations of this study indicate that the Darcy number and thermal Grashof number have the capability to enhance the velocity distribution of the Ree–Eyring nanofluid in the presence of bioconvection. The trapped bolus size and the skin friction coefficient increase noticeably because of an enhancement in the Ree–Eyring fluid parameter. Also, the Darcy number and the Hall current parameter increase the skin friction coefficient. Furthermore, validation of the results is carried out to examine the consistency between the current and the previous findings for some special cases and excellent agreements are found.

Sliding wear characteristics and wear constitutive equation of lead-free white metal under various lubricating liquids

In the present study, sliding wear experiments are conducted on lead-free white metal under three types of lubricating fluids, that is, two types of lubricating oils and water, and the sliding wear characteristics and friction coefficient of the sliding surface of the white metal are investigated. Lubricating fluids were selected with viscosities varying widely from 1.0 × 10−3 to 409.7 × 10−3 Pa s. Based on the experimental results, the constitutive equations of sliding wear, the coefficient of friction, and the effects of lubricating oil viscosity η and compressive stress σ are investigated. The coefficient of friction is proportional to σ0.5 and η−0.5. Therefore, as η increases in the low σ region, the coefficient of friction decreases and the amount of wear decreases. Conversely, as η decreases in the high σ region, the coefficient of friction increases; thus, the amount of wear increases and the sliding surface seizes. Furthermore, a method for quantitatively predicting the sliding wear life of white metals is devised from the perspective of machine maintenance. The wear life required to achieve a certain wear depth can be estimated using the wear constitutive equation proposed by the authors, which is expected to facilitate the safety management of bearings and the extension of their operating life.

Flow across moving plate at separated stagnation point: Features of corcione’s correlation with Thompson and Troian slip and melting heat

The dynamic features of nanofluids replicate multiple implications in the processes of cooling, environmental architecture, heat pumps, electromagnetic flow cytometry, energy generation, hyperthermia, and other related processes. The goal of this study is to investigate the Corcione correlation, which highlights the importance of fluid temperature, particle volume fraction, and particle size in increasing the nanofluid’s heat transfer rate and thermal conductivity considering the promising applications of nanofluids. In this case, we ponder about the flow of a nanofluid made up of and through a sliding plate, where the fluid experiences unstable separated stagnation point flow coupled with melting heat transfer. Nanoparticles with diameters of 28, 30, and 45 nm and concentrations of up to 4% by volume are all accounted for in the study. The Thomson and Troian slip conditions improve the mathematical model. In this work, we propose a novel mathematical model of a nanofluid and provide analogous solutions in the manner of ODEs. Estimated solutions to reduced ODEs are calculated using MATLAB's bvp4c method. Several graphics illustrate the impact of many elements. Over a given volume percentage, the Nusselt number and drag force coefficient are calculated for a range of nanoparticle sizes, and it is shown that both increase with increasing nanoparticle diameter (). Based on the findings, the skin friction coefficient and heat transfer rate both increase when stagnation strength parameters are raised. The thermal conductivity was also enhanced by the inclusion of the suction constraint. Curiously, improving heat-transfer performance is proportional to decreasing the unsteadiness parameter. The manufacturing and operations systems are two areas where this heavy engagement is particularly evident in furthering industrial progress. We may also infer that the incorporation of nanoparticles into the working fluid enhances heat transfer and that surface slip boosts draining control.

The key to the enhanced performance of slab-like topologically interlocked structures with non-planar blocks

Topologically interlocked structures are assemblies of interlocking blocks that hold together solely through contact. Such structures have been shown to exhibit high strength, energy dissipation, and crack arrest properties. Recent studies on topologically interlocked structures have shown that both the peak strength and work-to-failure saturate with increasing friction coefficient. However, this saturated structural response is only achievable with nonphysically high values of the friction coefficient. For beam-like topologically interlocked structures, non-planar blocks provide an alternate approach to reach similar structural response with friction properties of commonly used materials. It remains unknown whether non-planar blocks have similar effects for slab-like assemblies, and what the achievable structural properties are. Here, we consider slab-like topologically interlocked structures and show, using numerical simulations, that non-planar blocks with wave-like surfaces allow for saturated response capacity of the structure with a realistic friction coefficient. We further demonstrate that non-planar morphologies cause a non-linear scaling of the work-to-failure with peak strength and result in significant improvements of the work-to-failure and ultimate deflection — values that cannot be attained with planar-faced blocks. Finally, we show that the key morphology parameter responsible for the enhanced performance of non-planar blocks with wave-like surfaces is the local angle of inclination at the hinging points of the loaded block. These findings shed new light on topologically interlocked structures with non-planar blocks, allowing for a better understanding of their strengths and energy absorption.

Hydrocarbon condensation flow and heat transfer in wave helical pipes: Effect of structure parameters

In this study, two types of wave-structured pipes for heat exchangers that are easy to process are proposed, and the condensation pressure drop and heat transfer performances for hydrocarbon refrigerant upward flow in wave helical pipes are investigated. A numerical method based on the inhomogeneous two-fluid model is introduced and validated by experimental data in literature. The effect of wave parameters (wave height and wave length) on heat transfer, pressure drop and flow patterns are studied. At lower vapor quality conditions, it is found that as wave height increases, frictional pressure drop and heat transfer coefficient exhibit a trend of initially increasing, followed by decreasing, and then increasing again. However, under higher vapor quality conditions, frictional pressure drop and heat transfer coefficient continue to increase. Besides, both the frictional pressure drop and heat transfer coefficient increase with the decrease of wave length. The averaged enhancement on frictional pressure drop for vertical wave pipes and horizontal wave pipes are respectively 1.279–5.148 and 1.238–5.808 times, while the average augmentation in heat transfer coefficient is 1.243–3.006 and 1.316–3.579 times, respectively. The comprehensive thermal performance of wave pipes was assessed using the performance evaluation criterion. The range of averaged performance evaluation criteria (under different vapor qualities) in vertical wave pipes and horizontal wave pipes are respectively 1.150–1.737 and 1.230–2.026. The horizontal wave pipe when the wave height is 5 mm and wave length is 5.24 mm shows the best overall thermal performance, with an averaged performance evaluation criterion of 2.026. The two types of wave-structured pipes proposed in this paper can increase the pipe length of the spiral-wound heat exchanger at the same volume, while also improving the performance of the spiral-wound heat exchanger. The outcomes of the study can offer some assistance in creating simple but effective spiral wound heat exchangers.

Simulated and experimental study on the relationship between coefficient of friction and temperature of aluminum-based brake disc

PurposeThis study aims to clarify the relationship between the coefficient of friction (COF) and temperature of aluminum-based brake discs.Design/methodology/approachThree friction blocks with different COFs are examined by a TM-I-type reduced-scale inertial braking dynamometer. On this basis, the thermo-mechanically coupled model of friction pairs is established to study the evolution of brake disc temperature under different COFs using ADINA software.FindingsResults indicate that the calculated disc temperature field matches the experimental well. The effect of COF on the peak temperature is magnified by the braking speed. With the COF increasing, the rise rate of instantaneous peak temperature is accelerated, and the dynamic equilibrium period and cooling-down period are observed in advance. The increase in COF promotes the area ratio of the high-temperature zone and the maximum radial temperature difference. When the COF is increased from 0.245 to 0.359 and 0.434 at 140 km/h, the area ratio of high-temperature zone increases from 12% to 44% and 49% and the maximum radial temperature difference increases from 56°C to 75°C and 83°C. The sensitiveness of the axial temperature difference to the COF is related to the braking time. The maximum axial temperature difference increases with COF in the early stages of braking, while it is hardly sensitive to the COF in the later stages of braking.Originality/valueThe effect of COF on the aluminum-based brake disc temperature is revealed, providing a theoretical reference for the popularization of aluminum-based brake discs and the selection of matching brake pads.

Lubrication analysis of low-speed and heavy-load journal bearing in wind turbine gearbox under different operating conditions

Aiming at the working conditions of frequent starting, low speed and heavy load, and yaw tilting of radial sliding bearings in wind turbine gearboxes, a numerical analysis model of the lubrication performance coupled with instantaneous starting and operating conditions of radial sliding bearings was established based on the average Reynolds equation, and the start-up phase was analyzed. The motion trajectory of the shaft diameter and the axis center was used to obtain the change state of the bearing film thickness from the start-up to the stable stage; the influences of the comprehensive surface roughness, the journal inclination angle, and the journal rotation speed on the lubrication performance of the bearing during the whole stage of start-up and stable operation were studied respectively. The results show that the eccentricity has a maximum value in the starting stage, and the risk of film rupture caused by rough contact is the greatest. With the increase of the comprehensive surface roughness, the bearing capacity and friction coefficient both increase, and the maximum bearing capacity and friction coefficient in the starting stage are higher than those in the stable stage, which increase by about 13.62% and 131.58% respectively. With the increase of the inclination angle of the shaft diameter, the bearing capacity and friction coefficient both increase, and the maximum load capacity and friction coefficient in the starting stage are about 30% and 116% higher than those in the stable stage on average. With the increase of the speed, the bearing capacity of the bearing increases and the friction coefficient decreases, which is beneficial to improve the bearing performance. The calculation results provide an important basis for evaluating the wear risk of sliding bearings under frequent starting conditions, and provide a reference for the structural design and selection of sliding bearings, operating temperature, oil film pressure, etc.

Study of Wear Resistance of a Radial Bearing Covered by a Polymer Coating with an Axial Groove on a Nonstandard Base Surface

This paper is devoted to study of increasing the wear resistance of a radial plain bearing. The operation of a bearing is considered in the hydrodynamic mode by means of application of an antifriction polymer composite coating with an axial groove and the micropolar properties on a nonstandard bearing surface adapted to the friction conditions of a bearing bush. The effect of pressure and temperature in the turbulent friction mode on the rheological properties of the lubricant is taken into account. Based on the equation for the micropolar fluid flow in a “thin layer” as well as on the dependence of the micropolar lubricant on the pressure and temperature and on the continuity equation, a self-similar solution has been found taking into account the axial groove on the surface of a bearing bush and without taking into account the axial groove. As a result, the velocity and pressure fields in the axial groove and on the surface of a polymer antifriction composite coating have been determined as has the load capacity and friction force, which make it possible to increase the load capacity, reduce the friction coefficient (increase wear resistance), and also increase the duration of the hydrodynamic mode. The results of numerical analysis of theoretical models and experimental evaluation of the suggested design are presented to verify and confirm the efficiency of the models obtained.

Research on tribological behaviour and interfacial characteristic of Polyimide-MoS2 composite under cryogenic-vacuum environment

Tribological behaviour of Polyimide (PI)-MoS2 composite, pure PI, sputtering MoS2 film is investigated under RT-vacuum and cryogenic-vacuum through in-situ methods, i.e., X-ray photoelectron spectrum (XPS), X-Ray Diffraction (XRD), residual gas analyzer (RGA). Cryogenic causes an increase of friction coefficient (friction coefficient) of PI-MoS2 and pure PI, while it is inverse for sputtering MoS2 film. The friction interface is influenced by enriched water under cryogenic, and the possible mechanism is intermolecular hydrogen bonds caused by water restrict the formation of high oriented shear layer. Due to MoS2 film is not as sensitive as PI to moisture, oxidation at friction interface is relaxed because of cryogenic, which leads to a better friction behavior. Cryogenic causes compressive stress at the interface between PI matrix and MoS2 particles, which results in high friction coefficient due to the difficulty in release of the latter and breakage in some regions in where PI covers MoS2. Local cryogenic environment complicates the investigation in which the only purpose is to study the effect of cryogenic-vacuum on tribological properties of some lubricants.

Analytical model and rotational performances of dovetail mortise-tenon connection at the column head of traditional wooden frame

This paper presents an analytical model of dovetail mortise-tenon (DMT) connection at the column head of traditional wooden frame. Firstly, the characteristic of geometric deformations at the tenon is revealed based the geometric model when the tenon rotates clockwise and anticlockwise, and the analytical expressions for these deformations are given. Then, the extension deformations are obtained based the numerical model, these extension deformations at the surface of the mortises are fitted by the two-dimensional functions in two rotational directions. Finally, the analytical model of DMT connection is derived based the stress distribution at the tenon when it rotates in two directions, and the proposed model agrees well with the corresponding numerical model. Moreover, the effect of parameters including geometric dimensions and frictional coefficient on the rotational performance of DMT connection is studied based two models. The results showed that the difference of the two models is magnified as the friction coefficient increases, the resisting moment of the DMT connection is proportional to the cube of height of tenon and the length of tenon. More refined extension deformation analysis of mortise is needed for general expression of the DMT connection, since the extended deformation of the mortise varies as the inclination angle of the side surface of tenon changes.

Tribological properties of graphene/β-Si3N4 whisker reinforced Si3N4 ceramic composites

Exploring ceramic-based self-lubricating materials with low coefficient of friction (COF) has become one of the hot directions to advance the service performance and life of high-end equipment. In this work, the tribological properties of multilayer graphene (MLG)/β-Si3N4 whisker (β-Si3N4w)/Si3N4 ceramics were investigated. The effects of load and linear speed on the dry sliding COF were discussed. The friction-reducing and self-lubricating mechanisms of MLG and β-Si3N4w were deeply analyzed according to the wear morphology and mechanical properties of Si3N4-based ceramics. The friction frequency was proposed to analyze the wear mechanism. Results indicated that MLG and β-Si3N4w led to a breakthrough reduction in COF. At the load of 5–20 N, the COF reached an ultra-low level of 0.04–0.07, which was a further 89.86% lower than the reported studies. The comprehensive enhancement of mechanical properties and the existence of MLG lubricating film were the mainly responsible for the ultra-low COF. The COF of MLG/β-Si3N4w/Si3N4 ceramics raised to 0.24–0.31 at 50–200 mm/s, but it was still 33.88–47.64% lower than that of graphene/Si3N4 ceramics. The increase in COF was attributed to the high wear induced by the raised friction frequency. The furrow wear and adhesive wear were the main wear forms of MLG/β-Si3N4w/Si3N4 ceramics.

Rheology of gyrotactic microorganisms in Jeffrey fluid flow: A stability analysis

Non-Newtonian fluids display fascinating and versatile flow behavior, enabling applications in fields where precise control and manipulation of viscosity are required. This paper presents the rheology of Homann stagnation point flow for a Jeffrey fluid containing gyrotactic microorganisms over a biaxially stretching surface. The system of equations is solved numerically using appropriate similarity transformations and conditions. The boundary conditions are set to maintain a fixed physical environment, and the far field values are defined accordingly. The dual solutions are found and expressed in terms of relevant quantities, and their behavior is analyzed using graphical representations via bvp5c. Stability analysis is conducted as well. The model is extended to study the behavior of Jeffrey nanofluids under the influence of various physical phenomena such as thermophoresis, Brownian motion, Ohmic heating, heat source/sink, radiation, and chemical reaction. The model presented in this paper can help researchers predict and optimize the behavior of such systems for a range of industrial and biomedical applications. It is observed that when the smallest eigenvalue is positive, the disturbance initially decreases, and the flow is stable, otherwise unstable. The stretching/shrinking parameters affect the flow field and boundary layer characteristics, leading to changes in the skin friction forces and an increase in the skin friction coefficient. Moreover, the Peclet number augmented the concentration of microorganisms due to gyrotactic bioconvection for first and second solutions, whereas bioconvective Lewis number shows an opposite trend. The comparison of the present results, as a simplified case, with existing literature demonstrates good agreement.

Theoretical analysis, finite element modeling and experimental investigation of the impact of friction between tube and bending die on the formability of the tube during the free-bending process

In the free-bending process, the tube undergoes bending and deformation due to the action of a guide mechanism and bending die. The plastic deformation zone of the bent tube is less constrained by the die, and the quality of the formed tube is significantly affected by the friction between the tube and the die. To assess the impact of friction between tube and die on the formability of the bent tube, the theoretical modeling that considers the friction coefficient is conducted. Afterward, the free-bending experiments and finite element simulations are performed using Cr12MoV and ceramic bushing. The theoretical and experimental results are compared with those obtained from finite element simulation under different friction conditions to confirm the validity of finite element simulation. The influence of friction on the arc radius, wall thickness variation, and cross-section deformation of the curved tube is explored and discussed. With the increase of friction coefficient, the arc radius decreases gradually, the wall thickness thickens more obviously, and the cross-sectional distortion becomes more serious. Furthermore, the effect of different bushing materials on the surface quality of aluminum alloy and stainless-steel bent tubes is experimentally investigated. Those findings expand our understanding of the influence of tube-die friction on deformation behavior and it is necessary to first determine the friction condition during the actual free-bending forming process.

Study of Wear Resistance of a Radial Bearing Covered by a Polymer Coating with an Axial Groove on a Nonstandard Base Surface

This paper is devoted to study of increasing the wear resistance of a radial plain bearing. The operation of a bearing is considered in the hydrodynamic mode by means of application of an antifriction polymer composite coating with an axial groove and the micropolar properties on a nonstandard bearing surface adapted to the friction conditions of a bearing bush. The effect of pressure and temperature in the turbulent friction mode on the rheological properties of the lubricant is taken into account. Based on the equation for the micropolar fluid flow in a “thin layer” as well as on the dependence of the micropolar lubricant on the pressure and temperature and on the continuity equation, a self-similar solution has been found taking into account the axial groove on the surface of a bearing bush and without taking into account the axial groove. As a result, the velocity and pressure fields in the axial groove and on the surface of a polymer antifriction composite coating have been determined as has the load capacity and friction force, which make it possible to increase the load capacity, reduce the friction coefficient (increase wear resistance), and also increase the duration of the hydrodynamic mode. The results of numerical analysis of theoretical models and experimental evaluation of the suggested design are presented to verify and confirm the efficiency of the models obtained.

Simulation study and performance analysis of free piston linear generator (FPLG) used for ORC system

Due to advantage of low friction loss, simple structure and good sealing, free piston linear generator (FPLG) presents great application potential in ORC system. In this study, the FPLG simulation model was built using GT Suite and MATLAB/Simulink, and the model accuracy was verified through comparison with experimental data and error analysis. The influence of FPLG operation parameters, model parameters and full consideration of friction and EV characteristics on FPLG performance were studied. All the relative errors are within 10%, namely, the FPLG model has high reliability. Each indicator varies significantly with intake pressure, but relatively weakly with intake temperature. There is an optimal external load for maximum power output, and an optimal pipeline diameter for maximum velocity and average power output. As friction coefficient increases, both velocity and power output increase first and then decrease. When friction coefficient is 1200 N-s/m, average power output and velocity reach the maximum value of 102 W and 0.83 m/s, respectively. The velocity gradually decreases with the increasing flux linkage, while electromagnetic force and power output show a increasing trend. The research results can provide reference significance for optimization of FPLG and provide guidance for the application in ORC system.

Tribological and thermomechanical evaluation of polypropylene nanocomposites containing different dimensional structures of carbon and ceramic nanoparticles

ABSTRACT This study describes the development of PP nanocomposites using hydrothermally assembled carbon nanotubes (CNTs)/barium titanium (BT) (denoted as BTC) and graphene nanosheets (GNs)/boron nitride (BN) (denoted as BNG) nanoparticles. The PP nanocomposites were fabricated via the development of a masterbatch using polypropylene maleic anhydride (PPMA), followed by diluting with pure PP via melt compounding. The wear resistance and thermomechanical properties of the nanocomposites exhibited a substantial improvement, where about 96.8% increase in wear resistance and low coefficient of friction were recorded. While about 230% increase in glass transition temperature was measured with the nanocomposites relative to the pure PP. The developed nanocomposites have potential applications in automobile and other machine components where high wear resistance and thermal-mechanical properties are required.

Immature bovine cartilage wear is due to fatigue failure from repetitive compressive forces and not reciprocating frictional forces

Wear of articular cartilage is not well understood. We hypothesize that cartilage wears due to fatigue failure in repetitive compression instead of reciprocating friction. This study compares reciprocating sliding of immature bovine articular cartilage against glass in two testing configurations: (1) a stationary contact area configuration (SCA), which results in static compression, interstitial fluid depressurization, and increasing friction coefficient during reciprocating sliding, and (2) a migrating contact area configuration (MCA), which maintains pressurization and low friction while producing repetitive compressive loading in addition to reciprocating sliding. Contact pressure, sliding duration, and sliding distance were controlled to be similar between test groups. SCA tests exhibited an average friction coefficient of μ=0.084±0.032, while MCA tests exhibited a lower average friction coefficient of μ=0.020±0.008 (p<10-4). Despite the lower friction, MCA cartilage samples exhibited clear surface damage with a significantly greater average surface deviation from a fitted plane after wear testing (Rq=0.125±0.095 mm) than cartilage samples slid in a SCA configuration (Rq=0.044±0.017 mm, p=0.002), which showed minimal signs of wear. Polarized light microscopy confirmed that delamination damage occurred between the superficial and middle zones of the articular cartilage in MCA samples. The greatest wear was observed in the group with lowest friction coefficient, subjected to cyclical instead of static compression, implying that friction is not the primary driver of cartilage wear. Delamination between superficial and middle zones implies the main mode of wear is fatigue failure under cyclical compression, not fatigue or abrasion due to reciprocating frictional sliding.

The Effect of Clamping Force and Friction Coefficient on The Clamping Clamp

In order to study the influence of clamping force and friction coefficient on the stress distribution of drill pipe joint during the buckling process, the nonlinear contact problem and elastoplastic mechanical properties of Φ139.7mm × 9.17mm drill pipe were simulated by finite element analysis method in this paper, and the stress distribution and size of drill pipe joint during the buckling process were obtained. And the effect of clamping force and friction coefficient on the joint of drill pipe. It is found that the stress of drill pipe joint is mainly concentrated in the contact position of drill pipe and the stress value of drill pipe joint shows a trend of increasing. When the friction coefficient is 0.15 and the clamping force is 600KN, although there is stress concentration in the contact position between the clamp teeth and the drill pipe joint, it does not exceed the yield limit of the drill pipe joint, and no plastic deformation occurs. Through the simulation calculation, it is found that the maximum clamping force and the maximum torque are 1200KN and 81.9KN.m respectively. When the torque is fixed, the change of friction coefficient has a great influence on the maximum clamping force of drill pipe joint. With the increase of friction coefficient, the maximum clamping force of drill pipe joint decreases continuously, and the friction coefficient is inversely proportional to the maximum clamping force. The research in this paper enriches the understanding of the buckling process of punching pliers and provides a reference for the rational buckling of pipe string.

Atomic simulation for the effect of nano-cutting parameters on the 3D surface morphology of polycrystalline γ-TiAl alloy

γ-TiAl alloy is one of the most potentially lightweight and high-temperature structural materials, and its machined surface quality has a significant effect on member service performance. Despite the extensive research on plastic removal and defect evolution under different cutting parameters, the forming mechanism of surface topography is not perfect under different cutting parameters. It is necessary to study the variation law of surface topography under the influence of different cutting parameters from the atomic scale. To this end, the influence of cutting depths and cutting speeds on the machined surface topography is investigated during nano-cutting of polycrystalline γ-TiAl alloys based on molecular dynamics simulation methods, and the effect of defective grain boundaries on cutting force fluctuations is analyzed. The results show that the effect of grain boundary on material deformation and dislocation obstruction is the main reason for the peak cutting force; with the increase of cutting depth, the average cutting force and friction coefficient increase, and both Sa and Sq show an increasing trend, which is the result of the joint action of plowing effect and grain boundary distribution; Sa and Sq show a decreasing and then increasing trend with the increase of cutting speed, and the critical cutting speed is 200 m s−1. This indicates that a smaller cutting depth and an appropriately higher cutting speed can effectively improve the surface quality of the polycrystalline γ-TiAl alloy, and optimize its nano-cutting process.

Using the improved inner slider to enhance overturning resistance of DFPB-isolated structure subjected to poundings

The overturning resistance of structures isolated by double friction pendulum bearing (DFPB) would be significantly reduced due to the presence of pounding. To this end, an improved inner slider (IIS) is introduced to enhance the overturning resistance of the DFPB-isolated structure when it is subjected to poundings. Numerical simulations were conducted to investigate the performance of IIS in reducing the potential overturning risk of isolated structure as well as the seismic responses. Influences of displacement ratio, friction coefficient ratio and radius ratio on coefficient of overturning resistance of the structures isolated by DFPB with IIS were also evaluated though parametric studies. The pounding force and its transmission to the superstructure can be significantly mitigated by IIS, and the overturning resistance performance of structures isolated by DFPB with IIS is superior to those isolated by DFPB with traditional inner slider. The threat of overturning for isolated structures is generally greater with lower displacement ratios. Structures equipped with IIS in DFPB experience a decrease in their coefficient of overturning resistance as the friction coefficient increases, and the coefficient of overturning resistance first increases and then decreases with the increase in radius ratio.