Srinivasa Chikkol Venkateshappa

GM Institute of Technology, Davangere | GMIT · Mechanical Engineering

The need for non-conventional natural fibres for synthesis of hybrid composites has gained momentum in the recent past. Taking into consideration this need, in the current study, hybrid composites were fabricated by reinforcing wood apple shell powder and coconut shell powder, in the resin with varying amounts of cenospheres (up to 20 wt% in increm...

Areca fruit husk fibers are generally consisting of hemicellulose, lignin, wax and some of the inorganic components. Present study concentrates on the extraction and characterization of hemicellulose and lignin from these areca fruit husk fibers which shall be used in composite preparation. In order to extract hemicellulose and lignin, different mo...

The deflection analyses performed using MSC/NASTRAN on skew plates under different loads such as (concentrated and uniformly distributed loads) for clamped boundary conditions are presented in the present study. The CQUAD4 and CQUAD8 components of MSC/NASTRAN are verified using values from the literature. The CQUAD8 element was employed in the pres...

Composite materials offer good mechanical and dynamic performance with lower weight than classical materials. These specific properties have encouraged the use of composites in many industry applications such as automotive, construction or sports, among others. The abundant availability and accessibility of natural fibers are the major reasons for...

K E Y W O R D S A B S T R A C T Areca leaf sheath reinforced composites Finite Element Method Natural frequency Surface modification MSC/NASTRAN The present work deals with the experimental and finite element free vibration studies on areca leaf sheath reinforced polymer composites. In this study fundamental frequencies are obtained for five bounda...

The present work focuses on determining the fundamental frequencies of skew sandwich plates with face sheets considered to be classical thin plates, which are made of a graphite-epoxy material and an orthotropic core made of glass reinforced-epoxy using different boundary conditions. The fundamental frequencies were obtained using finite elements,...

The present work focuses on determining the fundamental frequencies of skew sandwich plates with face sheets considered to be classical thin plates, which are made of a graphite-epoxy material and an orthotropic core made of glass reinforced-epoxy using different boundary conditions. The fundamental frequencies were obtained using finite elements,...

The current work focuses on the experimental and finite element free vibration studies of laminated composite sandwich skew plates. The comparison was made between the experimental values obtained by the Fast Fourier transform (FFT) analyzer and a finite element solution obtained from CQUAD8 finite element of The MacNeal-Schwendler Corporation (MSC...

The present work emphasizes the determination of the fundamental frequency of skew sandwich plates with orthotropic core and laminated facings using different design parameters. Finite elements CQUAD4 and CQUAD8 of MSC/NASTRAN are used for obtaining fundamental frequencies, which are validated against available literature results. The influence of...

Polymer composites with different fiber fractions 0, 12, 24, 36 and 48 wt% of short areca sheath fibers were prepared and the relative effect on its physical, mechanical and tribological characteristics were examined. From the investigation it is found that the theoretical or the measured density decreases with increase in the fiber concentration....

The fiber fraction in a composite will have a significant influence on its behavioural aspects and is reported in the current study. With different fiber fractions (0, 12, 24, 36 and 48 wt%) of the areca sheath fiber reinforcing agent, composite specimens were prepared and its physical and mechanical properties were examined. The measured density o...

Presently, the world is looking for non-polluting, non-toxic, renewable, low density, corrosion resistant, eco-friendly, and low-cost material as replacement for the most challenging elements like plastics and its derivatives. Meanwhile, some of the composites were also made with some challenging facts concerning biodegradability properties. Thereb...

Composite materials have been used widely in various engineering fields. Composite materials possess low weight, corrosion resistance property, and specific strength, and due to these facts, composite materials are becoming popular among researches and scientists. Now a day, the glass fibers offer the potential to acts as a reinforcing material for...

In the past, asbestos and copper were preferred as friction materials because they have good ability to dissipate heat, but have proven to be harmful to the environment. Recently, more researchers are focused on non-asbestos friction composite materials due to its non-toxicity and biodegradability. Despite synthetic fiber composites having eco-frie...

Present study mainly deals with the extraction of fundamental frequencies using simply supported and clamped isotropic and laminated faced skew sandwich plates with the orthotropic core. Available literature values were referred to validate the fundamental frequencies obtained using the finite element method. The effects of aspect ratio, skew angle...

Even though Bio-based composites are eco-friendly, they are susceptible to degradation owing to both mechanical as well as biological factors. While it is evident that moisture affects the composites considerably, there are other factors such as heat and abrasion that could further accelerate the degradation. This article aims to encapsulate a few...

Nowadays, current inventions are concentrated on the use of natural fibers which are biodegradable, eco-friendly, and easily available constituents such as fibers of hemp, sisal, coconut viz. viz. along with polymers to achieve greater strength with reduced weight of composites. Green composite materials are becoming interested in their application...

A high specific stiffness, high specific strength, and tailoring the properties for specific application have attracted the attention of the researchers to work in the field of laminated composites and Sandwich structures. Rapid use of these laminated composites and Sandwich structures necessitated the development of new theories that suitable for...

Present study mainly deals with the extraction of fundamental frequencies using simply supported and clamped isotropic and laminated faced skew sandwich plates with the orthotropic core. Available literature values were referred to validate the fundamental frequencies obtained using the finite element method. The effects of aspect ratio, skew angle...

Coconut shell and wood apple shells are the two non-consumable (non-food/ protective)parts in the coconut and wood apple fruits. Immense availability of these shells in the Asian countries will produces the maximum amount of agro wastes. But these two shells have high potential due to their high strength and modulus properties. Coconut and wood app...

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Natural fiber composites have become a new tradition as an alternative to conventional materials. To meet this new tradition material testing, newer techniques have been set up that are termed as dynamic mechanical analysis (DMA), which is an adaptable methodology that accompanies the more traditional techniques. Through these techniques, it is sum...

Many review articles were published on free vibration and buckling of laminated composites , sandwich plates, and shells. The present article reviews the literature on the buckling and free vibration analysis of shear deformable isotropic and laminated composite sandwich plates and shells using various methods available for plates in the past few d...

The present work deals with the experimental and finite element free vibration studies on isotropic and laminated anti-symmetric angle-ply composite plates with central cut-out under clamped-free–clamped-free boundary condition. The natural frequencies were determined using the CQUAD8 finite element of MSC/NASTRAN and comparison made between the ex...

Naturally available filaments have recently become attractive to researchers, engineers, and scientists because of suitability as an alternative reinforcement for fiber reinforced polymer composites. Low cost, fairly good mechanical properties, non-abrasive and bio-degradability attributes, abused as a swap for the regular fiber. The tractable prop...

This paper presents the deflection studies made on skew plates subjected to uniformly distributed load/concentrated load for simply supported boundary conditions using MSC/NASTRAN. The CQUAD4 and CQUAD8 elements of MSC/NASTRAN are validated against literature values. The CQUAD8 element has been found to yield better results compared with the CQUAD4...

This paper presents the deflection studies made on skew plates subjected to uniformly distributed load/concentrated load for simply supported boundary conditions using MSC/NASTRAN. The CQUAD4 and CQUAD8 elements of MSC/NASTRAN are validated against literature values. The CQUAD8 element has been found to yield better results compared with the CQUAD4...

This paper presents the deflection studies made on skew plates subjected to uniformly distributed load/concentrated load for simply supported boundary conditions using MSC/NASTRAN. The CQUAD4 and CQUAD8 elements of MSC/NASTRAN are validated against literature values. The CQUAD8 element has been found to yield better results compared with the CQUAD4...

This paper presents the deflection studies made on skew plates subjected to uniformly distributed load/concentrated load for simply supported boundary conditions using MSC/NASTRAN. The CQUAD4 and CQUAD8 elements of MSC/NASTRAN are validated against literature values. The CQUAD8 element has been found to yield better results compared with the CQUAD4...

It's a research on Natural fiber composites, in this work mechanical properties have been discussed for natural fibers.

Natural fibers are used as reinforcements in the preparation of composites in order to get superior mechanical properties. But the drawback associated with natural fibers is their low thermal processing temperature, which is around 200 °C. In this work, natural abaca fiber was subjected to various chemical treatments and their influence on the ther...

This paper deals with experimental and finite element studies on the buckling of isotropic and laminated composite skew plates with circular holes subjected to uniaxial compression. The influence of skew angle, fiber orientation angle, laminate stacking sequence and aspect ratio on critical buckling load are evaluated using experimental method (usi...

Experimental studies were made on isotropic cylindrical skew panels made of Aluminum 7075-T6 and laminated composite cylindrical skew panels under uniaxial compression. The experimental values of the critical buckling load (Pcr) were determined using five different methods. The values of Pcr were also determined using MSC/Nastran and CQUAD8 finite...

Untreated abaca fibers and benzenediazonium chloride treated abaca strands were employed as reinforcements for fabricating polypropylene composites by injection molding method. Various composites were fabricated with different fiber loadings of 30%, 35%, 40%, 45% and 50% with and without coupling agents. Abaca composites without coupling agents wit...

Lead Guest Editor SRINIVASA C.V. Professor & P.G. Coordinator, Department of Mechanical Engineering, GM Institute of Technology, Davangere, India 577006. Email: srinivas@gmit.info

The focal point of this research work is on the preparation of untreated and chemically treated abaca reinforced epoxy composites and the impact of these pre-treatments on tensile and flexural behavior of the composites. Alkali treatment, acrylation, permanganate treatment and benzenediazonium chloride treatments were carried out on abaca strands....

In the recent decades, natural lignocellulosic fibers are used as reinforcements in the fabrication of polymer composites which are considered as most promising materials in structural applications due to its superior properties, eco-friendly nature and economic advantages. The main drawback of usage of these natural fibers as reinforcement for com...

The focal point of this research work is on the preparation of untreated and chemically treated abaca reinforced epoxy composites and the impact of these pre-treatments on tensile and flexural behavior of the composites. Alkali treatment, acrylation, permanganate treatment and benzenediazonium chloride treatments were carried out on abaca strands....

The focal point of this research work is on the preparation of untreated and chemically treated abaca reinforced epoxy composites and the impact of these pre-treatments on tensile and flexural behavior of the composites. Alkali treatment, acrylation, permanganate treatment and benzenediazonium chloride treatments were carried out on abaca strands....

Experimental studies were made on isotropic cylindrical panels made of Aluminum 7075-T6 under uniaxial compression. The experimental values of the critical buckling load were determined using four different methods. The critical buckling load was also determined using MSC/NASTRAN and CQUAD8 finite element. The experimental values of the critical bu...

This paper presents the finite element studies made on free vibration of isotropic and laminated composite cylindrical skew panels. A finite element analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN software. The effects of the panel angle, skew angle, aspect ratio, and length-to-thickness-ratio on fundamental natural frequency...

Experimental studies were made on isotropic skew plates made of aluminum 7075-T6 and laminated composite skew plates under uniaxial compression with unloaded edges completely free and one loaded edge restrained completely and the other loaded edge restrained except translationally in the direction of loading. Experimental values of the buckling loa...

In this investigation, the effect of surface modifications of abaca fiber by alkali and benzene diazonium chloride on the tensile strength of abaca fiber reinforced polypropylene matrix composites was studied. Natural fibers are having low cost, low density and are biodegradable. All these points are on the positive side but they are hydrophilic. T...

This study focuses on the fabrication and characterization of untreated, alkali treated, acrylated, benzene diazonium chloride treated, and permanganate treated abaca fiber reinforced epoxy composites. Composites are prepared with different fiber loadings of 10%, 20%, 30%, 40%, 50% and 60% by hand lay-up technique. Impact properties for the prepare...

At present natural fibers are gaining tremendous progressive importance as renewable, light weight, strong, environmentally acceptable and biodegradable reinforcement material for composite preparation as automobile industry is currently shifting to ―green‖ outlook, as consumers are looking for environmentally friendly vehicles. An important disadv...

In this investigation, the effect of surface modifications of abaca fiber by alkali and benzene diazonium chloride on the tensile strength of abaca fiber reinforced polypropylene matrix composites was studied. Natural fibers are having low cost, low density and are biodegradable. All these points are on the positive side but they are hydrophilic. T...

In this study bidirectional abaca fiber mat and E-glass fiber mat were used as reinforcements for the fabrication of hybrid composites with epoxy resin by hand layup technique. Composites with different fiber loadings of 30% (20% glass fibers+10% abaca fibers), 40% (20% glass fibers+20% abaca fibers) and 50% (20% glass fibers+30% abaca fibers), and...

The present paper deals with experimental and finite element studies carried out on free vibration of isotropic and laminated composite cylindrical skew panels. Natural frequencies were determined using CQUAD8 finite element of MSC Nastran, and comparison was made between the experimental values and the finite element solution. Effects of the skew...

The present paper deals with the experimental studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were also determined using QUAD8 finite element of MSC/NASTRAN and a comparison was made between the experimental values and the finite element solution. The effects of the skew angle and aspe...

The present paper deals with the experimental and finite element studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were determined using CQUAD8 finite element of MSC/NASTRAN and comparison made between the experimental values and the finite element solution. The effects of the skew angle...

This paper presents the finite element studies on free vibration of isotropic and laminated composite cylindrical skew panels. The analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN. The effects of the panel angle, skew angle, aspect ratio and length-to-thickness-ratio on fundamental frequency of isotropic cylindrical skew panels...

This paper presents the finite element studies made on free vibration of isotropic and laminated composite cylindrical skew panels. A finite element analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN software. The effects of the panel angle, skew angle, aspect ratio, and length-to-thickness-ratio on fundamental natural frequency...

The present paper deals with the experimental studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were also determined using QUAD8 finite element of MSC/NASTRAN and a comparison was made between the experimental values and the finite element solution. The effects of the skew angle and aspe...

In this study bidirectional abaca fiber mat and E-glass fiber mat were used as reinforcements for the fabrication of hybrid composites with epoxy resin by hand layup technique. Composites with different fiber loadings of 30% (20% glass fibers+10% abaca fibers), 40% (20% glass fibers+20% abaca fibers) and 50% (20% glass fibers+30% abaca fibers), and...

Experimental studies were made on isotropic skew plates made of aluminum 7075-T6 and laminated composite skew plates under uniaxial compression with unloaded edges completely free and one loaded edge restrained completely and the other loaded edge restrained except translationally in the direction of loading. Experimental values of the buckling loa...

The present paper presents the finite element studies made on critical buckling load of isotropic and laminated composite cylindrical skew panels. Analysis is performed using CQUAD4 and CQUAD8 elements of MSC/NASTRAN. It is found that the CQUAD8 element yields better results compared to the CQUAD4 element in terms of accuracy and convergence. Using...

Natural fibers are considered to have potential use as reinforcing agents in polymer composite materials because of their principal benefits: moderate strength and stiffness, low cost, and being an environmental friendly, degradable, and renewable material. A study has been carried out to evaluate impact properties of composites made by areca fiber...