In this study, the tribological performance of polyamide‐6 (PA‐6), polypropylene (PP), polyamide‐6/polypropylene (PA‐6/PP) polymer blend, and nanoclay reinforced polyamide‐6/polypropylene composite are investigated. Nanoclay reinforced polymer composite is produced by melt compounding using co‐rotating twin screw extruder followed by injection moulding. Tribological studies are carried out using a pin‐on‐stainless steel disc configuration under dry sliding conditions. Tribological tests are carried out at sliding speed of 0.5 m s−1 and applied load values of 25, 50,100, 150 N. The friction coefficient and specific wear rate values are obtained and evaluated. The results show that the addition of nanoclay into the PA‐6/PP polymer blend reduced their coefficient of friction and specific wear rate values. The lowest coefficient of friction and specific wear rate values are for nanoclay reinforced PA‐6/PP blend. The highest coefficient of friction and specific wear rate values are for PA‐6 polymer.

In this investigation, the mechanical properties of silver nitrate nanoparticles filled polypropylene composite is evaluated. The silver nitrate particles are added to the matrix by 1, 3, 5, and 10% by weight. The composite is prepared by adding the filler to polypropylene under heat and mix the mixture by mechanical stirrer. Then after the test samples are prepared under hot press. The tensile tests are carried out. The tensile strength, yield stress, tensile modulus, and the percentage of elongation to break are obtained and evaluated. The results show that the elastic modulus of the composite is in increase while tensile strength, rupture strength, and the percentage of elongation to break is in decrease with the increase in the content of silver nitrate particle fillers. The morphology, structure, and size of the silver nitrate particles are evaluated by scanning electron microscope.

In this study, the influence of micro-and nano-filler contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Chopped E-glass fiber-reinforced epoxy composites (10%, 30% and 50%) were fabricated and their mechanical and tribological behaviour was investigated. Three-point bending tests were performed according to the ASTMD790 and tensile tests were performed according to the ASTMD638 standards. Impact tests and hardness measurements of the composites were also carried out. Wear behaviour of composites was studied using pin on disc wear testing device. The design of experiments approach, using Taguchi method, was employed to analyze the results. Signal-to-noise ratio and analysis of variance were used to determine the influence of parameters on the wear rate and coefficient of friction.

In this study, the tribological behavior of epoxy composites was experimentally studied and analytically modeled using finite element techniques. Wear test and modeling were carried out for pin-on-disk configuration and under identical boundary and test conditions. The tribological elements consisted of Al2O3 filled epoxy composite pin and a steel disk. The tribological system was modeled two-dimensionally and a quasi-static analysis was performed. The wear amount and the developed stresses during the rubbing process were predicted and compared with the experimentally determined results. A good correlation between the experimental and analytical results were observed.

Chopped carbon fiber-reinforced epoxy composites were fabricated and tested for tribological behaviour. Wear behaviour of composites was studied using pin-on-disc wear tester device. The design of experiment, using Taguchi method, was employed to analyse the results. Signal to noise ratio and analysis of variance (ANOVA) were used to determine the influence of parameters on the wear rate and coefficient of friction.

An experimental study has been carried out to investigate tensile, bending, impact and hardness properties of chopped carbon fiber reinforced epoxy composites. Four different weight fractions (0%, 6%, 8%, 10%) were added as reinforcement to composites. The samples were manufactured by using a special designed mold. Tests were carried out according to the ASTM standards. Results of the tests have shown that hardness increases with the increasing amount of carbon fiber in composites. Tensile, bending and impact performances have increased up to 8% of carbon fiber in the composite and then started to decrease.

Chopped bamboo-reinforced epoxy composites were fabricated and tested to investigate their tribological properties. Three different weight fractions of 6%, 8% and 10% were used as reinforcement in the composites. Wear behaviour of composites was investigated by pin on disc wear testing device. To analyse the results the design of experiments (DOE) approach by using the Taguchi method was employed. Three different parameters (load, sliding speed, weight fractions) with three levels were chosen in design of experiments. Signal to noise ratio and analysis of variance (ANOVA) were used to investigate the influence of parameters on the wear rate and the coefficient of friction. According to the results, load was the most effective parameter for both wear rate and coefficient of friction.

Lightness is a very important parameter in the automotive industry. So, one of the main aims of the automotive makers is to use lighter materials such as foams in automobile parts. In this study, PP polymer and 20% wt. talc and EPDM filled PP composite foams were produced using the traditional injection moulding method. Scanning electron microscopy was used to examine and to characterise the PP polymer foam and PP composite foam structure. Furthermore, mechanical and microscopy tests were also carried out to examine the strength and reliability of the foam material. The results showed that the lightness of the material varies between 8% and 29% depending on the amount of chemical foaming agent in PP and PP-T-EPDM composite. Therefore, it is recommended for use in vehicle parts.

Abstract In this investigation, the tribological and mechanical performance of 10 wt.-% filled nano and micro epoxy composites were studied and compared. Nano fillers are Al2O3, TiO2 and clay and micro fillers are Al2O3, TiO2 and fly ash. Mechanical and wear tests were carried out. Wear tests were performed on pin-on-disc arrangement. Test conditions were 5, 10, 15 N applied load values, sliding speed of 0.8 m × s−1, 2000 m sliding distance under dry atmospheric conditions. The results show that the mechanical and tribological performance of micro filler filled epoxy composites are better than those of the nano filler filled composites.

In this study, the tribological performance of graphite and wax filled nylon composites was predicted and optimized with the assistance of the Taguchi analysis method. Experimental data from our previous published work are handled. The experimental results are transformed into a signal-to-noise (S/N) ratio using the Taguchi method. This ratio presents the quality characteristics of the experimental results. Tribological performance of nylon 6 (polyamide 6) composites was predicted and optimized. The type of material, applied load, and sliding speed exert effects on the specific wear rate, at 85.06, 2.17, and 3.26, were obtained, respectively. Furthermore, the estimated S/N ratio using the optimum testing parameters for specific wear rate was calculated and a good agreement was observed between the predicted and experimentally determined values for a confidence level above 90.

In engineering applications when materials start sliding against each other the problem of friction and wear appears.In the case of polymers the friction between them can be attributed to two main mechanisms: deformation and adhesion.One of the important application fields for polymers is the medical engineering.In this field, the UHMWPE polymer is one of the important candidant polymer material.In this investigation, the friction and wear performance of GUR 1020 medical grade UHMWPE polymer under dry sliding conditions is evaluated.The sliding experiments were carried out on a pin-on-AISI stainless steel disc arrangement.Wear tests were carried out under room temperature, 50, 100and 150N load values and at 0.50, 1.0 and 2.0m/s sliding speed conditions.The results show that the coefficient of friction for GUR 1020 medical grade UHMWPE polymer is significantly influenced by applied load, sliding speed values.Furthermore, the coefficient of friction and specific wear rate increases with the increase in applied load and sliding speed values.The specific wear rate values for GUR 1020 medical grade UHMWPE polymer under dry condition is at the order of 8x10 -14 m 2 /N.The friction coefficients vary between 0.12 and 0.20.Finally, the wear mechanism includes abrasive and adhesive processes.

In this investigation, the influence of filler size (micro and nano scale) and applied load values on the tribological behaviour of epoxy composites were studied. Wear tests were carried out on pin-on-disc arrangement. The tribo elements consist of the polymer pin and DIN 1.2344 steel counterface disc. Test conditions were 5-15N applied load values, sliding speed of 0.8m/sec, 2000m sliding distance and at dry atmospheric conditions. The friction coefficient and specific wear rate values for the epoxy composite material were obtained and evaluated. The results show, the large influence of filler size and type on the performance of the epoxy composite.

An experimental study has been carried out to investigate tensile and bending properties of carbon fiber (CFRE) and glass fiber-reinforced (GFRE) epoxy composites. Three different fiber orientations were applied, 0 degrees, 90 degrees and [0 degrees, 90 degrees]. The laminates were obtained by manual lay-up process. The samples were evaluated by tensile tests according to the ASTM D3039 and bending tests according to the ASTM D790. Experimental results showed that maximum tensile strengths were observed at 0 fiber direction for the both CFRE and GFRE composites. With respect to their tension properties, the CFRE samples had better performance than the GFRE samples, except for the 90 degrees orientation. Three point bending tests proved that in all orientations CFRE composites had better performance, compared to GFRE composites.

E-glass fiber reinforced epoxy composites were fabricated by hand lay up method and tested for investigating tribological behaviours. Wear behaviours of composites 0 degrees, 90 degrees and [0 degrees/90 degrees] oriented were investigated by pin on disc wear tester device for a constant distance (1000 m) and the design of experiments approach using the Taguchi method was employed. The tests were conducted sliding against a steel disc (60 HRC) under different sliding and loading conditions. Signal to noise ratio and analysis of variance (ANOVA) were used to investigate the influence of parameters on the wear rate and coefficient of friction.

This investigation, the filler materials are Al2O3, TiO2, fly ash and clay in nano and micro nano scale. The influence of filler size ( nano and micro scale) and applied load values on the mechanical properties of epoxy composites were studied. Tensile, three points bending and hardness were carried out. The results show, the large influence of filler size and type on the performance of the epoxy composite. Furthermore, generally, the micro filler filled epoxy composites show better mechanical than the nano filler filled composites.

In this study, ultrahigh molecular weight polyethylene (UHMWPE) polymer was studied for boundary lubricated friction and wear behaviour under distilled water lubricated conditions. Sliding wear tests were carried out using pin-on-disc apparatus. UHMWPE polymer in the form of the pin was tested against AISI 304L stainless steel disc. Wear tests were performed at room temperature under 50, 100 and 150 N applied loads and at 0.5 and 2.0 m/s sliding speeds. The obtained results show that the coefficient of friction for UHMWPE polymer is significantly influenced by the increase in applied load and sliding speed values. Finally, the average specific wear rate values for UHMWPE polymer under water lubricated condition is in the order of 1.4 × 10−14 m2/N.

Abstract In this study, the influence of wax content on the electrical, thermal and tribological properties of a polyamide 6 composite filled with 15% wt. graphite was investigated. The wax filler contents of the composite were by 2, 4 and 6 wt.%. Characterisation of the composites was obtained using a Fourier transform infrared spectroscopy test. Electrical performance tests were carried out, and the dielectric real values (ε′) and imaginary values (ε″) were recorded. Thermal differential scanning calorimetry tests were carried out, and the glassy and melting temperatures of the composite materials were recorded. Furthermore, tribological tests were carried out and the friction coefficient and wear rate of the composites were recorded. The results show that the increase in wax content led to the increase in the permittivity values (ε′ and ε″) of the composites. The increase in wax content also led to the decrease in the friction coefficient and wear rates of the composite materials. Furthermore, the glassy and melting temperatures of the composite materials showed a sensitivity to the wax content. Finally, it is concluded that optimum properties, in total, were obtained in the composite filled with 6 wt.% wax.

In this experimental study, the friction and wear performance of medical grade UHMWPE polymer under egg albumen lubrication condition are evaluated. The sliding experiments were carried out on a pin-on-disc wear tester. The contact configuration used was a polymer pin on a rotating stainless steel disc. Tests conditions were 2000m travelling distance, room temperature, 40 to 120N load and 0.5 m/s sliding speed. The results show that the coefficient of friction and specific wear rate increase with the increase in load and speed values. The coefficient of friction of UHMWPE under egg albumen 20g/l lubricant conditions is lower than that of under egg albumen 10g/l lubricant conditions. Moreover, for the range of load and speed values of this study the specific wear rate using egg albumen lubricant registered lower values than that of the dry conditions. Finally the specific wear rate values for medical grade UHMWPE polymer at egg albumen lubricant conditions are at the order levels of 0.5x10 -14m 2/N respectively.