R-method as multi criteria decision-making method was proposed to determine the ranking of alternatives and performance criteria or attributes of dental composite materials. Five alternatives (DHM0, DHM2, DHM4, DHM6, and DHM8: nomenclatures of micro-nano ceramic particulate filled dental restoration composites) and 14 attributes (performance criteria) were considered in this research. The decision-maker determined the relevance of each rank and then attributed it to the performance criterion. In a similar manner, the options were ranked in relation to each performance criterion according to the associated performance criteria. Therefore, the order of the ranks of dental composites is DHM8 (1st rank) > DHM4 (2nd rank) > DHM6 (3rd rank) > DHM0 (4th rank) > DHM2 (5th rank). The suggested technique is showed simpler and advance compared to the other generally employed decision-making techniques.

This investigation assesses the mechanical characterization and dry sliding wear performance of ZA-27-SiC-Gr alloy composites. The novelty lies in (i) design of ZA27-SiC (0, 1, 3, 5 wt%)-Gr (0, 1, 3, 5 wt%) alloy composite formulations; (ii) fabrication of ZA-27-SiC-Gr alloy composites using high vacuum casting process following industrial standard; (iii) according to ASTM standards, the specimen of each alloy composite was evaluated for its physical, mechanical, and dry sliding wear behavior using Multi-Specimen Dry Sliding Wear Tribometer; (iv) sliding wear parameter optimization analysis was carried out using Taguchi methodology; and (v) worn surface micrographs were examined for comprehending the wear mechanisms in charge of the wear of such alloy composites. The 5 wt% reinforcement exhibits improved overall physical and mechanical characteristics as well as sliding wear performance. The results of the AHP-TOPSIS study were found to be consistent with the composition ranking based on objective analysis. Thus, decision-making tools like AHP-TOPSIS could help material engineers choose materials in challenging situations.

This research investigates the physical, mechanical, thermal, thermomechanical and dry sliding wear performance of marble dust particulates (0–20 wt.% @ step of 5%) and lapinus fiber (10 wt.% constant) reinforced polyamide 66 polymer composites, resulting in five hybrid polymer composite namely PLM-0, PLM-5, PLM-10, PLM-15 and PLM-20, respectively. A twin screw extruder and injection molding machine were used for the fabrication. Taguchi's method and ANOVA tools are used to optimize and determine the significant order of the input parameters for the sliding wear process, followed by surface morphology investigations. Finally, the hybrid AHP-R ranking method was applied to rank the compositions on their merits. It is observed that PLM-10 hybrid polymer composites have shown relative overall optimized performance. It shows the lowest density of 1.21 g/cc, voids content of 6.47%, water absorption of 4.51% and a specific wear rate of 1.03 × 10 −3 mm 3 /Nm. In comparison, it shows the highest tensile strength of 112.64 MPa, flexural strength of 150.40 MPa, Rockwell hardness of 60.40 HRM, fracture toughness of 4.27 MPa√m, impact strength of 1.96 J, thermal conductivity of 0.98 W/mK and storage modulus of 1824.29 MPa. Finally, these subjective findings were found to be in tune with the findings of the hybrid AHP-R method.

This research work investigates the physical, mechanical, thermal, thermo-mechanical, and dry sliding wear characteristics of hybrid flyash particulates (F-class; 0 – 20 wt.% at the step of 5%)–basalt fibres (chopped; fixed 10 wt.%) reinforced polyamide 66 polymer composites fabricated using the twin screw extruder and injection moulding machine. Taguchi's design of experiment optimization approach is used for parameter optimization of the dry sliding wear process, followed by analysis of variance analysis. Further, the hybrid AHP-R method is used for ranking optimization based on the performance metrics. It is observed that the composition having 15 wt.% flyash particulates optimizes overall performance metrics, hence recommended for industrial parts fabrications. It has an experimental density of 1.23 g/cc, voids content of 5.93%, water absorption of 4.21%, tensile strength of 110.73 MPa, flexural strength of 146.72 MPa, Rockwell hardness of 62.44 HRM, fracture toughness of 4.17 MPa√m, impact strength of 2.06 J, the thermal conductivity of 1.24 W/mK, and specific wear rate of 7.55 × 10 −4 mm 3 /Nm. The overall subjective ranking of the hybrid polymer composites attunes with the objective ranking by the hybrid AHP-R method.

In this research work, hybrid polyamide 66–basalt fiber (10 wt%)–marble dust particulates (0–20 wt% with a variation of 5%) polymeric composites were designed and prepared through the injection molding method. Each composition sample was analyzed for its physical, mechanical, and thermal behavior. The Taguchi methodology was adopted to design experimental runs of dry sliding wear and for input operating parameter optimization, along with analysis of variance. Using a scanning electron microscope, worn-out surface micrograph examinations were carried out to comprehend wear mechanisms across the surface. Furthermore, a decision-making tool such as a hybrid Analytic Hierarchy Process – R method (hybrid AHP-R method) was applied to determine the ranking of the composites based on performance measures. The composition having polyamide 66 supplemented with 15 wt% marble dust particulate and 10 wt% basalt fiber tends to optimize overall performance measures. It shows voids content of 5.80%, water absorption of 2.54%, tensile strength of 117 MPa, flexural strength of 154 MPa, impact strength of 2.8 J, Rockwell hardness of 64 HRM, thermal conductivity of 1.11 W/mK, fracture toughness of 4.7 MPa√m, and specific wear rate of 7.05 × 10 −4 mm 3 /Nm, respectively. Thus, it optimizes overall performance measures along with steady-state dry sliding wear behavior, which is in tune with the ranking results obtained by the hybrid AHP-R method.

This research work examines the physical, mechanical, thermal, thermo-mechanical, and dry sliding wear performance of hybrid waste flyash particulates (F-class; 0-20 wt% @ step of 5%) – Lapinus fibres (fixed 10 wt%) reinforced Polyamide 66 polymer composites fabricated using the twin screw extruder and injection moulding machine. This follows worn surface morphology to understand the prevailing wear mechanisms responsible for surface damage during sliding. Optimization of control parameters and identification of their order of significance in the dry sliding wear process is performed using Taguchi’s design of experiments and analysis of variance (ANOVA). Further, ranking optimization of the hybrid composite specimens based on their performance metrics is analysed using the hybrid AHP-R method. It has been observed that the hybrid composite specimens having 10 wt% flyash particulates optimize the overall performance metrics; therefore, it may be recommended to fabricate parts or components for industrial usage. It tends to have an experimental density of 1.18 g/cc, voids content of 7.11%, water absorption of 3.87%, tensile strength of 105.95 MPa, flexural strength of 144.86 MPa, Rockwell hardness of 58.12 HRM, fracture toughness of 4.11 MPa√m, Impact strength of 1.86 J, thermal conductivity of 1.08 W/mK, and specific wear rate of 1.12 × 10 −3 mm 3 /Nm. This observation was attuned to the ranking analysis using the hybrid AHP-R method.

- The present uses of natural fibers as a partial replacement for the synthetic fibers and there by utilizing eco-friendly materials in various automotive applications namely bumpers, wind shields, doors, ceilings etc. Although there are many research findings related to natural fiber composites. These fibers are also having high strength to weight ratio as well as high stiffness to weigh ratio, etc. With increasing environmental concerns natural fibers are once again being considered as reinforcements for polymer composites. Due to the environmental awareness and economical considerations, natural fiber reinforced polymer composites seems to present a viable alternative to synthetic fiber reinforced polymer composites such as glass fibers. In this present work cocciniagrandis fiber composites with polyester resin are fabricated by using compression molding process. The mechanical properties like tensile, hardness, density, surface roughness and wear test are carried out as per ASTM standards for the developed composites. The test result shows that cocciniagrandis composite alkaline treated fiber plate in tensile test in higher value and had shore D hardness of 87.5 which are superior to all the other developed composites. The average density of this polymer composite is 1.0172 g/cc.

Abstract This paper reviews the effects of various reinforcements with the various thermoplastic polymer matrices. The articles contain the various thermoplastic polymers such as ABS, HDPE, LDPE, PP, PEEK, PC, PA, PI, UHMWPE and PMMA etc. The review contains the evaluation of tribological properties such as sliding wear and coefficient of friction (COF) of polymer matrix composites (PMCs). This review also evaluation of mechanical properties such as tensile strength, compressive strength, young modulus and hardness of polymer matrix composites (PMCs). The thermoplastic polymer composite used in various applications such as automotive industry, food processing machine industry, household appliance, military, structural and aerospace industry etc. The properties of thermoplastic polymer composite are varying with the fabrication techniques of composite.