A Review Paper on Biodegradable Composites Made from Banana Fibers

Composites are defined as mixture of two or more ingredients where one is called as matrix (larger in quantity) and other is called reinforcement (smaller in quantity). Now a days research is concentrated towards various methods of making biodegradable composites where either reinforcement or matrix are biodegradable or both are biodegradable. Composites have so many applications in industrial as well as commercial use due to their low weight to strength ratio that attracted the automobile manufacturers to use these materials in cars which in turn increases the efficiency as well as reduce the cost of the automobile. In this paper effort has been made to investigate various process of manufacturing composites manufactured from banana fibers using different matrix preferably PLA (Polylactic Acid). The methods of improving the bonding between the reinforcement and matrix, effect of fiber orientation, size of the fibers and percentage reinforcement has been studied.

Central Composite Experimental Design Applied to the Dry Sliding Wear Behavior of Mg/Mica Composites

A five-level four-factor central composite design multivariable model was constructed for the evaluation of the combined effect of operating parameters such as percentage reinforcement (0–10%), load (5–25 N), sliding speed (1–5 m/s), sliding distance (500–2500 m) on the wear rate of mica reinforced metal matrix composites. The microwave-assisted powder metallurgy technique was used to fabricate the composites. The wear tests were performed according to statistical designs to develop an empirical predictive regression model. The interaction of percentage reinforcement and sliding distance indicated the significant impact on wear rate. The statistical analysis confirms the optimum composition of mica blends leading to the best possible wear rate. No rapid wear region was identifiable in the morphology of worn composite surfaces.

Study of Dynamic Response of Wall Panel Subjected to Blast Load

Now a days due to increase in the terrorist activities, it becomes necessary to study the response of building when subjected to blast loading. The front wall of the building has direct effect of blast load. In the present study typical reinforced concrete wall panel was consider for dynamic analysis under blast load scenario. The dynamic analysis was carried out using Single Degree of Freedom Blast Effects Design Spreadsheets (SBEDS). The parametric study was carried out to study the effect of compressive strength of concrete, percentage reinforcement, thickness of wall and unsupported length of wall on response of building under blast load scenario. The results were presented in form of displacement time history and pressure impulse diagrams. The results indicate that the displacement of RC wall panel decrease as the increase in the thickness of wall panel, grade of concrete and percentage of reinforcement, but with the increase in unsupported length of RC wall panel, the displacement increases. The mode of failure of RC wall panel under blast load scenario was predicted using pressure impulse diagram. It was observed that as the increase in unsupported length of shear wall, the shear wall was prone to fail in flexural failure mode in impulsive as well as quasi-static region. The results also indicate that as the increase in thickness of wall, percentage reinforcement and compressive strength of concrete, the shear wall was prone to fail in direct shear mode in impulsive region and flexural mode in quasi-static region.

Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing

Friction stir processing (FSP) is solid state novel technique developed to refine microstructure and to improve the mechanical properties and be used to fabricate the aluminium alloy matrix composites. An attempt is made to fabricate AA6061/TiB2 aluminium alloy composite (AMCs) and the influence of process parameters like rotational speed, transverse feed, axial load and percentage reinforcement on microstructure and mechanical properties were studied. The microstructural observations are carried out and revealed that the reinforcement particles (TiB2) were uniformly dispersed in the nugget zone. The Tensile strength and Hardness of composites were evaluated. It was observed that tensile strength, and hardness were increased with increased the rotational speed and percentage reinforcement of particles. The process parameters were optimized using Taguchi analysis (Single Variable) and Grey analysis (Multi Variable). The most influential parameter was rotational speed in single variable method and multi variable optimization method. The ANOVA also done to know the percentage contribution of each parameter.

Stiffness Revising to Recycled Course Aggregate Reinforced Concrete Beams under Short-Term Loading

This paper mainly studies the deflection under short-term loading of recycled course aggregate reinforced concrete beam is calculated by using of the formula of short-dated rigidity in code for design of concrete structures. According to testing the flexural performance of 6 recycled course aggregate beams with the same section size, different replacement ratio of recycled coarse aggregate of 0%, 50%, 70%, 100% respectively and different percentage reinforcement of 0.68%, 0.89%, 1.13% respectively, analyzes relation between deflection and replacement ratio of recycled coarse aggregate, deflection and percentage reinforcement, compare measured value and calculated value using of current codes and make statistical analysis this data . By regressing and analyzing the experimental data from literature, supplied short-dated rigidity modified formula of recycled course aggregate beam. The calculation results are in good agreement with the experimental data. The formula of short-dated rigidity can accurately calculate deflection under short-term loading of recycled course aggregate reinforced concrete beam, and can be referenced in engineering practice and correlative regulations.