scholarly journals The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

Polymers ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1429 ◽  
Author(s):  
Maciej Kujawa ◽  
Piotr Kowalewski ◽  
Wojciech Wieleba
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Polymeric Material ◽  
Tribological Properties ◽  
High Density Polyethylene ◽  
High Density ◽  
Polymer Materials ◽  
Surface Appearance ◽  
Wear Process ◽  
Mechanical And Tribological Properties

Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state that they interact frictionally, e.g., in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of, e.g., assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 h. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness, and surface free energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Deformed materials have a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Deformation under tension without heating of polymeric material (PE-HD), e.g., as a result of assembly, has been qualified as a threat to be taken into account when designing and analysing polymeric sliding elements.

scholarly journals The Influence of Deformation under Tension on Some Mechanical and Tribological Properties of High-Density Polyethylene

2019 ◽  
Author(s):  
Maciej Kujawa ◽  
Piotr Kowalewski ◽  
Wojciech Wieleba
Keyword(s):  
Polymeric Material ◽  
Tribological Properties ◽  
High Density Polyethylene ◽  
High Density ◽  
Polymer Materials ◽  
Surface Appearance ◽  
Wear Process ◽  
Mechanical And Tribological Properties ◽  
Lip Seals ◽  
Friction Measurements

Polymer materials are increasingly being used for sliding machine elements due to their numerous advantages. They are used even where they are deformed and in such a state they interact frictionally e.g. in machine hydraulics or lip seals. Few publications deal with the influence of deformation, which is the effect of e.g. assembly on tribological properties of polymeric material. This deformation can reach up to ε ≈ 20% and is achieved without increasing the temperature of the polymer material. The paper presents the results of investigations in which high-density polyethylene (PE-HD) was maintained in deformation by means of a special grip (holder). The wear of the sample was significantly higher than that of the undeformed sample. This effect persisted even after partial relaxation of the stress in the sample after 24 hours. Additional investigations were carried out to explain the obtained results. There were the microscopic observations of the surface after friction, measurements of microhardness and free surface energy. Changes in the value of surface free energy and a significant decrease in microhardness with deformation under tension were observed. Strained material had a different surface appearance after friction and a different size and form of wear products. It was indicated that it is probable that the cohesion of the material will decrease and that the character of the wear process will change as a result of tension. Tension without heating of polymeric material (PE-HD), e.g. as a result of assembly, has been qualified as a hazard to be taken into account when designing and analysing polymeric sliding elements.

Reinforcing Effect of Montmorillonite Nanoclay on Mechanical Properties of High Density Polyethylene Nanocomposites

2014 ◽  
Vol 591 ◽  
pp. 60-63 ◽  
Author(s):  
N. Venkatesan ◽  
G.B. Bhaskar ◽  
Kaliyaperumal Pazhanivel ◽  
K. Poyyathappan
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Solid Material ◽  
High Density ◽  
Polymer Materials ◽  
Good Surface ◽  
Melt Compounding ◽  
Standard Specimens ◽  
Twin Screw ◽  
Good Surface Finish

In recent years, many researches focused on the polymer materials to study the characteristics and to enhance the mechanical properties of the nanocomposites in order to understand the factors which lead to the desired dispersion of nanoclay in the polymer matrix. The samples used in this work were prepared through melt compounding, using high-density polyethylene and organo-modified clay of montmorillonite (MMT). During manufacturing of MMT/HDPE nanocomposites, a silane modifier and polyethylene grafted with maleic anhydride (compatibilizer) were added to get good surface finish and to act as bonding agent respectively. In addition, the compatibilizer will help in attaining better intercalation. Using a Plastograph-Mixer through twin-screw extruder, the high density polyethylene and different weight percentages (0, 1, 2, 3, 4 wt. %) of MMT are mixed and subsequently the composite is produced in the form of solid material. ASTM standard specimens for various tests are produced using injection molding machine with respective dies. The prepared experimental specimens for various tests like tensile, flexural, impact and shore-hardness are tested for its respective strengths. From this investigation, it is concluded that the addition of MMT nanoclay in HDPE has significantly influenced the mechanical properties of the composites.

scholarly journals THE INFLUENCE OF SURFACE FREE ENERGY ON TRIBOLOGICAL PROPERTIES OF OXIDE LAYER S FORMED ON ALUMINIUM ALLOY EN AW-5251

Tribologia ◽  
2018 ◽  
Vol 280 (4) ◽  
pp. 71-79
Author(s):  
Mateusz NIEDŹWIEDŹ ◽  
Marek BARA ◽  
Władysław SKONECZNY
Keyword(s):  
Free Energy ◽  
Aluminium Alloy ◽  
Surface Free Energy ◽  
Tribological Properties ◽  
Good Method ◽  
Electrolyte Temperature ◽  
Reciprocating Motion ◽  
Droplet Deposition ◽  
Oxide Layers ◽  
Tribological Tests

This paper presents the influence of the parameters of the formation of oxide layers on the surface free energy and the tribological properties of these layers. The layers were formed electrochemically on aluminium alloy EN AW-5251, with variable values of electrolyte temperature and current density. A three-component electrolyte was used to produce oxide layers. The surface free energy was determined by the droplet deposition method by measuring the wetting angles, while the van Oss-Chaunhury-Good method was used for the calculations. Tribological tests were performed on a T-17 tribological tester under conditions of technically dry friction for reciprocating motion. T7W composite was used as a specimen in tribological tests.

scholarly journals Parameterization of an interfacial force field for accurate representation of peptide adsorption free energy on high-density polyethylene

2015 ◽  
Vol 10 (2) ◽  
pp. 021002 ◽  
Author(s):  
Tigran M. Abramyan ◽  
James A. Snyder ◽  
Jeremy A. Yancey ◽  
Aby A. Thyparambil ◽  
Yang Wei ◽  
...  
Keyword(s):  
Free Energy ◽  
Force Field ◽  
High Density Polyethylene ◽  
High Density ◽  
Accurate Representation ◽  
Adsorption Free Energy ◽  
Peptide Adsorption ◽  
Interfacial Force

Relation between Microstructure and Tribological Properties of High Density Polyethylene Hybrid Composites Filled with Untreated Glass Spheres, Talc and Calcium Carbonate

2013 ◽  
Vol 592-593 ◽  
pp. 655-659
Author(s):  
Münir Taşdemir
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
High Density Polyethylene ◽  
Elasticity Modulus ◽  
Filler Content ◽  
Hybrid Composites ◽  
High Density ◽  
Structure And Properties ◽  
Glass Spheres ◽  
High Level

In the present work, high density polyethylene based composites filled with glass spheres, talc and calcite particles were prepared. Fillers contents in the HDPE were 5, 10, 15, and 20 wt%. The mechanical, morphological and tribological properties of the polymer composites were investigated. Substantial improvements in the some mechanical properties were obtained by the addition of filler. For example, the results showed that the elasticity modulus of composites improved with increasing the filler content. The addition of fillers to the HDPE changed significantly the friction coefficient and wear rate of the composites. HDPE filled with a high level content of fillers showed higher wear rate than pure HDPE under dry sliding. The structure and properties of the composites are characterized using a scanning electron microscopy (SEM).

Tribological Properties of MoS2 with Different Morphologies in High-Density Polyethylene

2012 ◽  
Vol 47 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Kun Hong Hu ◽  
Xian Guo Hu ◽  
Jin Wang ◽  
Yu Fu Xu ◽  
Cheng Liang Han
Keyword(s):  
Tribological Properties ◽  
High Density Polyethylene ◽  
High Density
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