Composite materials with thermoplastic matrices and a reinforcement of natural fibers are increasingly regarded as an alternative to material replacement for various applications. The substitution of the traditionally used composite of natural fibers such as sisal, banana and jute can lead to a reduction of the component's weight and furthermore to a significant improvement of specific properties like impact strength, compression strength. One of the major fields of application for such materials can be found in structural components manufacturing of construction helmets. In this project work natural fiber particle reinforced materials such as Sisal, Banana and jute reinforced polymer composite material with epoxy resin has been used for fabrication of construction helmet. Impact strength and compression strength values are identified. The helmet manufacturing aspects are reviewed. Both the thermoplastic and the natural fiber composite shell manufacturing techniques are presented with specific mentioning of the advantages and disadvantages to each type from the manufacturing point of view.

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The Elliptical Annular Fin (EAF) circumscribing circular tube could be a good choice where the space is restricted to one direction and enough space is present in perpendicular direction or one side for material saving. This paper presents the performance of the EAF circumscribing circular tube. In this work fins with constant base temperature by free, forced convection and with heat dissipation from the fin to the surroundings have been considered. The performance of the EAF is evaluated from the surface temperature. The Shaped Tube Efficiency (STE) and Fin Effectiveness (FE) with respect to Biot number are calculated using surface temperature. The result shows that STE and FE decrease with increase in Biot number. With the same parameter of the experimental setup, the surface temperature, STE, and FE are analyzed by computational fluid dynamics (CFD). The surface temperature is calculated by experimental method, and CFD analysis is predicted with a maximum deviation of 0.4% and R 2 values were 99.6%. For STE and FE, the average deviation between the present computations and the experimental computations was observed to be less than 1.8% and 2%-it is an acceptable range. Based on the above results, the thermodynamic model has been developed.

The project is about analyzing the wing leadingedge modifications by leading edge droop which is used for NACA airfoil. The objective of this project is to show that there will be an increase in stalling angle by using droop leading edge modifications and for that Computational Fluid Dynamics (CFD) software, Fluent is used to depict the increase in stalling angle when drooped leading edge is used. Using Leading Edge Drooping, achieved increased in the lift coefficient than the normal airfoil and we have tailored the stall characteristics by using leading-edge droop. And by using leading-edge droop we can successfully increase the stall/departure characteristics.

This paper presents the numerical analysis of elliptical fin circumscribing circular tube for various shape factor 0.13, 0.25, 0.39, 0.65 are considered. The EAF are fed with constant heat inputs under free convection. The result shows that physical representation of the temperature distribution and isotherms of the EAF for shape factors 0.13, 0.25, 0.39, and 0.65. The analysis shows that the increase in surface area along major axis gradually reduces the surface temperature in that direction. The result predicts that EAF can be used in space restricted places instead of circular fins by increasing the surface area along major axis. This will reduce the cost, space and time for analysis by experimenting.