Impact of hot molding temperature and duration on braking behavior of friction material

The manufacturing process of brake materials used for braking applications consists of a succession of steps among which the hot molding has a major impact on properties and performance of materials. In this paper, impact of hot molding temperature and duration on mechanical and thermal properties of friction materials developed with simplified formulation was investigated. Two different hot molding conditions were studied: condition 1 (low temperature associated to long duration) and condition 2 (high temperature associated to short duration). Braking behavior, thermo-mechanical phenomena and wear and friction mechanisms were also investigated. Results indicated that hot molding conditions did not significantly affect mechanical properties and tribological behavior, but they had impact on thermal properties (material molded according to condition 1, material A presented a higher thermal conductivity) and on wear mechanisms involved in the contact. In addition, results revealed that the studied hot molding conditions impacted thermal localization recorded during braking that was denser for the disc rubbed against material B (material molded according to condition 2).

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Physical, mechanical and thermal properties of Crushed Sand Concrete containing Rubber Waste

MATEC Web of Conferences ◽

10.1051/matecconf/201814901076 ◽

2018 ◽

Vol 149 ◽

pp. 01076

Author(s):

Guendouz Mohamed ◽

Boukhelkhal Djamila

Keyword(s):

Thermal Conductivity ◽

Thermal Properties ◽

Flexural Strength ◽

Municipal Solid Waste ◽

Solid Waste ◽

Bulk Density ◽

Mechanical And Thermal Properties ◽

The Past ◽

Rubber Waste ◽

And Performance

Over the past twenty years, the rubber wastes are an important part of municipal solid waste. This work focuses on the recycling of rubber waste, specifically rubber waste of used shoes discharged into the nature and added in the mass of crushed sand concrete with percentage (10%, 20%, 30% and 40%). The physical (workability, fresh density), mechanical (compressive and flexural strength) and thermal (thermal conductivity) of different crushed sand concrete made are analyzed and compared to the respective controls. The use of rubber waste in crushed sand concrete contributes to reduce the bulk density and performance of sand concrete. Nevertheless, the use of rubber aggregate leads to a significant reduction in thermal conductivity, which improves the thermal insulation of crushed sand concrete.

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MECHANICAL AND THERMAL PROPERTIES OF SAWDUST CONCRETE

Jurnal Teknologi ◽

10.11113/jt.v79.9341 ◽

2017 ◽

Vol 79 (6) ◽

Cited By ~ 1

Author(s):

Ruhal Pervez Memon ◽

Abdul Rahman Mohd. Sam ◽

A. S. M. Abdul Awal ◽

Lemar Achekzai

Keyword(s):

Heat Transfer ◽

Mechanical Properties ◽

Tensile Strength ◽

Thermal Properties ◽

Lightweight Concrete ◽

Physical And Mechanical Properties ◽

Developing Nations ◽

Mechanical And Thermal Properties ◽

Construction Technology ◽

Long Duration

Industrialization in developing countries has resulted in an increase in agricultural output and consequent accumulation of unmanageable agro wastes. Pollution arising from such wastes is a matter of concern for many developing nations. The aim of this study is to investigate the behavior of lightweight concrete and the utilization of sawdust as waste material in concrete. This paper focuses on the manufacturing of concrete which possess long duration heat transfer by using sawdust waste. In this research, cement to sawdust ratio of 1:1, 1:2 and 1:3 by volume was prepared for sawdust concrete, and the ratio of sand was kept constant that is 1. At these ratios, the mechanical and thermal properties like density, workability, strength and heat transfer were measured after, 7, 28 and 56 days of air curing. The tests results show that with the increase in the amount of sawdust, the workability, compressive strength, tensile strength and flexural strength decreased. It also resulted in reduction of heat transfer of sawdust concrete. Taking into account the overall physical and mechanical properties, sawdust concrete can be used in construction technology.

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Influence of polystyrene modifier on features of polyvinylchloride plastics production

Chemistry, Technology and Application of Substances ◽

10.23939/ctas2021.01.166 ◽

2021 ◽

Vol 4 (1) ◽

pp. 166-171

Author(s):

D. S. Katruk ◽

◽

A. S. Masyuk ◽

V. Ye. Levytskyi ◽

◽

...

Keyword(s):

Thermal Properties ◽

Vinyl Chloride ◽

Polyvinyl Chloride ◽

Nano Composites ◽

Mechanical And Thermal Properties ◽

Performance Properties ◽

Nanoscale Particles ◽

Matter Volume ◽

Physical Modification ◽

And Performance

The main methods of physical modification of PVC materials is the combination with other polymers, including PS plastic, and the creation of polymer (nano) composites containing metal and silicate fillers. Modification of polyvinyl chloride by polystyrene plastic leads to obtain materials with reduced degree of plasticizer release out of matter volume, adjustable elastic-plastic characteristics, and enhanced physico - mechanical and thermal properties. Physical modification of vinyl chloride polymers by other polymers or nanoscale particles of inorganic nature enables predictable affect on the morphology of these materials and directed regulate their technological and performance properties.

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Transforming Marble Waste into High-Performance, Water-Resistant, and Thermally Insulative Hybrid Polymer Composites for Environmental Sustainability

Polymers ◽

10.3390/polym12081781 ◽

2020 ◽

Vol 12 (8) ◽

pp. 1781 ◽

Cited By ~ 2

Author(s):

Payal Bakshi ◽

Asokan Pappu ◽

Ravi Patidar ◽

Manoj Kumar Gupta ◽

Vijay Kumar Thakur

Keyword(s):

Thermal Conductivity ◽

Thermal Properties ◽

Impact Strength ◽

Injection Molding ◽

Environmental Sustainability ◽

Filler Concentration ◽

Mechanical And Thermal Properties ◽

Molding Temperature ◽

The Impact ◽

Marble Waste

Marble waste is generated by marble processing units in large quantities and dumped onto open land areas. This creates environmental problems by contaminating soil, water, and air with adverse health effects on all the living organisms. In this work, we report on understanding the use of calcium-rich marble waste particulates (MPs) as economic reinforcement in recyclable polypropylene (PP) to prepare sustainable composites via the injection molding method. The process was optimized to make lightweight and high-strength thermally insulated sustainable composites. Physicochemical, mineralogical, and microscopic characterization of the processed marble waste particulates were carried out in detail. Composite samples were subsequently prepared via the injection molding technique with different filler concentrations (0%, 20%, 40%, 60%, and 80%) on weight fraction at temperatures of 160, 180, and 200 °C. Detailed analysis of the mechanical and thermal properties of the fabricated composites was carried out. The composites showed a density varying from 0.96 to 1.27 g/cm3, while the water absorption capacity was very low at 0.006%–0.034%. Marble waste particulates were found to considerably increase the tensile, as well as flexural, strength of the sustainable composites, which varied from 22.06 to 30.65 MPa and 43.27 to 58.11MPa, respectively, for the molding temperature of 160 °C. The impact strength of the sustainable composites was found to surge with the increment in filler concentration, and the maximum impact strength was recorded as 1.66 kJ/m2with 20% particulates reinforcement at a molding temperature of 200 °C. The thermal conductivity of the particulates-reinforced sustainable composites was as low as 0.23 Wm−1K−1 at a 200 °C molding temperature with 20% and 40% filler concentrations, and the maximum thermal conductivity was 0.48 Wm−1K−1 at a 160 °C molding temperature with 80% filler concentration. Our findings have shown a technically feasible option for manufacturing a lightweight composite with better mechanical and thermal properties using marble waste particulates as a potential civil infrastructural material.

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