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This study mainly focuses on the wear and oxidation properties of highly cross linked UHMWPE (Ultra high molecular weight poly ethylene) replacing conventional UHMWPE as bearing material in Total Knee Arthroplasty (TKA) which were subjected to radiation under different sources and doses. Analysis of Vitamin E blended and Gamma radiated UHMWPE for TKA by simulation of artificial extended aging and daily heavy activities of a patient was done and observed no further degradation of the material due to wear and oxidation. It is noticed that improving wear resistance and anti-oxidation of the material depends on the radiation dose and post radiation treatment such as remelting used to remove free radicals in material. Mechanical property losses and wear losses during in vivo performance of a patient in longer period for two to three decades were also studied.

In this present study hybrid aluminium metal matrix composites (HAMMC) were prepared by employing stir casting technique at 725 °C. Reinforcements such as Alumina (Al2O3), Silicon carbide (SiC) and Boron carbide (B4C) of 44µ size were reinforced with base aluminium matrix Al-6061 T6 alloy. Wear test, Tensile test, Flexural test and Impact test were done on the hybrid aluminium metal matrix composites as per ASTM standards. It is observed that hybrid composite with 2 wt% each of SiC, Al2O3 and B4C has high tensile strength and wear strength. Composite with 6 wt% of B4C has second high tensile strength, hardness and impact strength when compared with rest of the hybrid composites because of its excellent mechanical properties. Porosity of the samples 1 and 2 is less than the value 2.3 which indicates greater uniformity of reinforcements in the matrix. Flexural strength and Hardness was studied and analysed. Morphological study of the hybrid composites was done using Scanning Electron Microscope (SEM) observed minimal cracks on the surface of the samples due to wear test.

The aim of this review is to study the effect of gamma radiation, particle size and molecular weight on the thermos mechanical and dynamic mechanical properties of the processed UHMWPE composites. Two studies were considered for analysing this report, one with MWCNT’s as reinforcement added to UHMWPE and processed through ball milling followed by gamma irradiation and the other study consists of analysing properties by comparing particle size and molecular weight of processed UHMWPE with purchased UHMWPE sample. From this study we observed radiated UHMWPE samples improves mechanical properties in larger extent and very less noticeable results from molecular weight and particle size have been observed between various grades of UHMWPE samples.

When utilised in arthroplasty applications, ultra-high-molecular-weight polyethylene (UHMWPE), the gold standard material for artificial joints, creates wear debris. The life of UHMWPE joints is generally restricted to 15–20 years due to unfavourable interactions of wear debris with surrounding tissues. Various attempts have been made in recent decades to enhance the material's wear resistance and performance. This study looks at the changes that have been made to increase its mechanical characteristics and wear resistance. Functionalization techniques, enhanced surface or bulk properties, and their various applications in medical implant fields (total hip arthroplasty, bone tissue engineering, joint implants) have all been extensively studied. A descriptive study of pure UHMWPE and its composite has been conducted in order to functionalize the features of medical implants.

Natural fibres now a days replacing the conventional structural materials such as Aluminium, steel, wood etc. with their excellent weight to strength ratio and with their high mechanical properties. In this present investigation hybrid composites were fabricated using Hand layup process using the natural fibres such as Banana, Coconut, Jute and Cotton fibres reinforced with Polyethylene at different weight proportions of 5, 8, 10, 12, 15, 18, 20 wt%. Tests such as water absorption, flexural rigidity, tensile, hardness and few other mechanical tests were conducted on the hybrid natural fibre reinforced composites. Among the hybrid composites the coconut fibre with 20 wt% and banana fibre with 18% shows high tensile strength with 56.4 N/mm2 and 54 N/mm2 and flexural strength. Water absorption is less in the hybrid composite with coconut and cotton fibres as reinforcements and gains mass of 5gm and 7gm.