Effect of Porosity and Normal Load on Dry Sliding Friction of Polymer Foam Blocks

Yamaguchi, Takeshi; Sugawara, T.; Takahashi, Motoi; Shibata, Kei; Moriyasu, Kenta; Hokkirigawa, Kazuo

doi:10.1007/s11249-018-0988-z

Cited by 18 publications

(7 citation statements)

References 13 publications

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“…The friction mechanisms present when sliding rubber over rough and smooth surfaces can greatly differ in both nature and magnitude. For smooth surfaces, the stress concentration that typically forms at the leading edge of sliding viscoelastic materials [9,10], is less likely to significantly affect the wearing of the rubber. Therefore, the contact area of a rubber block with lower stiffness is smaller, resulting in lower friction coefficients [8].…”

Section: Introductionmentioning

confidence: 99%

Rubber friction and the effect of shape

Hale

Lewis

Carré

2020

Tribology International

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Contrary to the classic laws of friction, rubber friction is not independent of shape. The friction of three shapes of the same rubber compound sliding over a dry-rough surface was measured. The three shapes had the same nominal contact area but different sliding direction-lengths and widths. Frictional differences were found between all three shapes at sliding speeds of 10 mm/s and 0.5 mm/s. The effect of frictional heating and other friction mechanisms that cause these differences are evaluated and discussed.

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Section: Introductionmentioning

confidence: 99%

Rubber friction and the effect of shape

Hale

Lewis

Carré

2020

Tribology International

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“…Thus, under the same speed and load, PPIs with higher porosity will release more oil from pores to form a lubricating film, which is favorable to alleviate the solid-solid rubbing and reduce the COFs of PPIs. Secondly, higher porosity will lead to smaller contact area and higher contact pressure under the same load [7,8] which will aggravate the solid-solid direct rubbing and increase the COFs of PPIs (Fig. 8).…”

Section: Effects Of Porosity On Friction Properties Of Porous Polyimimentioning

confidence: 99%

“…The tribological performance of PPMs could be affected by many factors [5][6][7][8][9][10][11], such as speed, load, oil viscosity, surface tension, pore diameter, porosity, the type and amount of additives. So far, however, researches related to PPMs have mainly focused on their preparation, the influences of internal solid and/ or oil lubricants on their tribological behaviors [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…There are only few published papers concerning the friction mechanism. Even if elegant works have been reported by Wang' group and Yamaguchi etc., involving the effect of porosity on the tribological performance of porous polymer material [7][8][9][10][11]17], systematic investigations of porous polyimide (PPI) are still lacking. Moreover, PPMs might operate in boundary, mixed and elastohydrodynamic lubrication (EHL) regimes with the increase of the speed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Porosity on the Friction Properties of Porous Polyimide Impregnated with Poly-α-Olefin in Different Lubrication Regimes

et al. 2020

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Porous polyimide materials (PPIs) having different porosity with a constant pore size were fabricated to further understand the effect of porosity on the friction properties in the boundary lubrication, mixed lubrication and elastohydrodynamic lubrication (EHL) regime, respectively. The tribological behaviors of non-porous polyimide (PI0) immersed in poly-α-olefin oil bath and PPIs impregnated with poly-α-olefin were firstly compared, and the effects of load and porosity on the friction performances were investigated. Results show that as the speed increases, the PPIs impregnated with oil exhibit the same friction coefficient (COF) change trend as PI0 immersed in poly-α-olefin oil, which is consistent with the stribeck curve, but the COFs in whole velocity range are higher, and the EHL arrived at a higher speed. The EHL critical speed of PPIs impregnated with oil, as well as the COFs during whole lubricating regime are closely related to the load and the porosity of the material. It mainly depends on two opposite effects of porosity on the friction properties. On one hand, PPIs with higher porosity will release more oil from pores under compression to form a lubricating film, on the other hand, higher porosity will lead to higher contact pressure under the same load, and provide larger contact areas as a result of the increase in the elastic collapse area, which will aggravate the solid-solid direct rubbing and increase the COFs.

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“…To realize this selective deformation mechanism, it is essential to create a porous structure that can be easily deformed by an external force when applied to the adhesive layer. [14][15][16] Porous structures are generally produced through gas saturation, template, and porogen methods. [17] These methods are utilized in the fields of biomaterials, optical devices, separation of membranes, sensors, and catalysts.…”

Section: Introductionmentioning

confidence: 99%

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

Lee,

Park,

Kim

et al. 2023

Adv Materials Technologies

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Recently, bioabsorbable vascular stents (BVSs) are actively studied owing to their ability to dissolve within the human body. However, despite their advantages, BVSs often dislodge from the expandable balloon‐based delivery system when transported to the lesion site. In this study, a novel methodology aiming at increasing the retention force between the stent and the delivery system is presented. The breath‐figure method is adopted to form a porous structure and enhance adhesion. Additionally, numerical and experimental methods are used to evaluate the effect of surface tension between two immiscible fluids (polymeric solutions and droplets). To control the interfacial tension between the solution and droplets, an amphiphilic polymer and NaCl‐added vapor are used. By selecting the appropriate parameters, a sponge‐like structure is prepared on the stent delivery system. To verify its applicability, the two types of structures presented in this study are experimentally compared. These findings provide valuable guidelines for understanding the mechanism of breath‐figure patterns. Thus, the innovative methodology developed in this study demonstrates simplicity and scalability for large‐area production, making it potentially applicable to industrial technologies and offering new insights into biomedical engineering.

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Effect of Porosity and Normal Load on Dry Sliding Friction of Polymer Foam Blocks

Cited by 18 publications

References 13 publications

Rubber friction and the effect of shape

Rubber friction and the effect of shape

Effect of Porosity on the Friction Properties of Porous Polyimide Impregnated with Poly-α-Olefin in Different Lubrication Regimes

Formation of Balloon with Porous Structures in NaCl Vapor Assisted by Amphiphilic Polymer for Stent Delivery System

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