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Fibers obtained from fruits, stem, and plant leaves are nature-based fibers and are known as natural fiber. Due to their versatile properties such as good mechanical behavior, low cost, eco-friendly, less dense, biodegradable, etc. natural fibers are getting focus amongst researchers. Since the density of bio-composites reinforced by natural fiber is significantly inferior to other traditional materials they satisfy the automotive need of high-performance vehicle parts/components of lightweight. To decrease the cost and weight of the vehicle automotive manufacturers are extensively utilizing the natural fibers (as interior insulation, seat bottom, door panels, dashboard, body panels, boot liner, etc.). Although, the composite of natural fiber has few shortcomings like poor chemical and fire resistance, poor interfacial bonding among matrix and fiber, moisture intake. Thus, natural fiber is required to be surface treated. Among the finest method for physical treatment is plasma treatment. Herein plasma which participates within surface modification directly is produced within the vacuum chamber by the ionization of the gas. The improved interfacial bonding in fiber composite is obtained as a result of surface treatment of plasma, which results in increase mechanical strength. Effect of surface treatment of plasma on several natural fiber is included in this paper and the aim of this review paper is to occupy the literature gap through this paper.

Natural fiber reinforced composites (NFRPCs) are picking up favour over man-made fiber inferable from their lower cost and ecological amicable attributes, as they exist plentifully and are sustainable. The ever-evolving ecological, biological, and prudent concerns lead to expanded acknowledgment of natural fiber in each territory of conventional synthetic material application. This is due to great fatigue as well as corrosion resistance, comparable strength, low cost, low density, abundantly available, nontoxicity and biodegradability and etc. of natural fibers. In the present study, the optimization of most commonly used natural fiber reinforced composites that is Banana and Sisal fiber hybrid composite on the basis of fiber loading and fractional distribution of banana and sisal fiber has been discussed. For Finite Element Analysis, the CAD model of specimens with different fiber loading ranging from 20 to 50 percent as well as with different fractional distribution of banana and sisal fiber were prepared as per the ASTM standards using CREO 5.0 modelling software. The specimens were loaded in order to get the failure in the specimen with the help of CAE software named as ANSYS 16.0. The trend in values of load are in very close resemblance to that obtained by Idicula et al. which provides experimental validation to the results of this finite element study. It was concluded that with increase in total fiber volume percentage the flexural and the tensile strength of the composite also increases. Since, the strength of banana fiber is significantly higher than that of sisal fiber that hence higher degrees of strength were observed with increase in concentration of banana fiber.