Gopalan Venkatachalam

Evaluation of tensile strength of hybrid fiber (jute/gongura) reinforced hybrid polymer matrix composites

The polymer matrix composites attract many industrial applications due to its light weight, less cost and easy for manufacturing. In this paper, an attempt is made to prepare and study of the tensile strength of hybrid (two natural) fibers reinforced hybrid (Natural + Synthetic) polymer matrix composites. The samples were prepared with hybrid reinforcement consists of two different fibers such as jute and Gongura and hybrid polymer consists of polyester and cashew nut shell resins. The hybrid composites tensile strength is evaluated to study the influence of various fiber parameters on mechanical strength. The parameters considered here are the duration of fiber treatment, the concentration of alkali in fiber treatment and nature of fiber content in the composites.

Dynamic Analysis of Banana Fibre Reinforced Hybrid Polymer Matrix Composite Using ANSYS and Optimization of Design Parameters

In the recent scenario, the focus for the environmental pollution and the piling of products from non-renewable and non-biodegradable resources has forced many researchers to develop new eco-friendly and biodegradable materials. In this work, banana fiber reinforced hybrid polymer matrix composite is fabricated and tested. Banana fiber is treated with various alkali solutions to modify surface properties in order to improve mechanical properties. Hybrid polymer is made from CNSL (Cashew Nut Shell Liquid) and Isotholic Polyester. Dynamic behavior of banana fibre reinforced hybrid polymer matrix composite is investigated by means of experimental and finite element analysis. Simulation of frequency response and dynamic displacement are carried out on banana fibre reinforced hybrid polymer matrix composite by ANSYS and it is compared with experimental results. Optimization of design parameter is carried out using ANOVA technique and design of experiment of Taguchi method is employed for better combination of the parameter.

Investigations on Influence of Geometric Parameters in Drawing of Perforated Sheet Metals

Forming Limit Diagram (FLD) is a resourceful tool to study the formability of sheet metals. Research on the formability of Perforated Sheet Metal is growing over the years as perforated sheet metal finds its applications in various fields. But finding FLD of perforated sheet metals is complex due to the presence of holes. Also, the hole size, shape and pattern, ligament ratio, thickness of the blank, percentage of open area influence the formability of a perforated sheet metal.In the present scenario, various simulation softwares have made the process of plotting FLD much easier, saving time and money. This paper is an attempt to predict the formability of mild steel perforated sheet metal through simulation software package LS Dyna. Also, Parametric analysis is performed to determine the influence of geometric parameters on the drawability of the perforated sheet metal.

Study of Forming Behaviour of Square Hole Mild Steel Perforated Sheet Metal

As the study of formability of perforated sheet metals using conventional approach is exhaustive and time consuming, Finite Element Analysis is used to carry out the same. This paper attempts to study the effects of perforation parameters (viz. hole size, open area and thickness) on the formability of square hole Perforated Mild Steel Sheet Metal. Finite element analysis is done using commercial Finite Element Analysis software LS-DYNA. Parametric analysis is carried out to optimize process parameters using Taguchi’s L9 orthogonal array. From the results obtained through simulation, the analysis of variance (ANOVA) is carried out to determine which group has best condition for drawing and regression equation is obtained to know, how a single response variable (Major or Minor strain) is related to a variety of predictor variables (percentage open area, hole size and thickness) and the graphs are plotted between them using MINITAB software.

Flexural analysis of palm fiber reinforced hybrid polymer matrix composite

Uncertainty in availability of fossil fuels in the future and global warming increased the need for more environment friendly materials. In this work, an attempt is made to fabricate a hybrid polymer matrix composite. The blend is a mixture of General Purpose Resin and Cashew Nut Shell Liquid, a natural resin extracted from cashew plant. Palm fiber, which has high strength, is used as reinforcement material. The fiber is treated with alkali (NaOH) solution to increase its strength and adhesiveness. Parametric study of flexure strength is carried out by varying alkali concentration, duration of alkali treatment and fiber volume. Taguchi L9 Orthogonal array is followed in the design of experiments procedure for simplification. With the help of ANOVA technique, regression equations are obtained which gives the level of influence of each parameter on the flexure strength of the composite.

Investigations on Wear and Frictional Characteristic of Hybrid Polymer

This study targets on wear and frictional characteristics of hybrid polymer. Experiments are carried out on hybrid polymers using reciprocating wear testing machine by sliding against mating steel plate. General purpose resin is blended with Cashew nut shell is used as test specimen. The values of frictional force, frictional coefficient and wear were measured to study the influence of accelerated wear.