48 research outputs found
Influence Of Nano Clay On Mechanical And Morphological Properties Of Sisal/Banana Fiber Reinforced Composites
No full textThis paper mainly focuses on the Nano clay effect in mechanical properties of sisal/banana hybrid FRP composites. The composites with and without the addition of Nano clay have been made by fusing sisal/banana fiber up to maximum volume of 30% as support in polymer matrix and mechanical properties are Investigated. The composite material prepared was tested for tensile, flexural, impact strength with aid of respective apparatus. Fiber length and % of weight were calculated
initially for preparation of specimens. Banana fiber was hybridized with sisal fiber to examine the changes in mechanical properties of the samples. Mechanical properties (Tensile strength, Flexural strength along with their modulus) of the composites with nano clay are found to be 0.8, 1, 1.5 and 2.3 times greater than that of composites without nano clay. 50% better results in the impact test were achieved. SEM analysis
was carried out on the samples after conducting the test to find out the fracture pattern and the fiber pull out. The experimental outcomes illustrate that under testing the mechanical properties shows an increase with adding up of Nano clay at higher volume fraction. Tensile & flexural properties show an affirmative hybrid effect
An experimental investigation and optimization of energy consumption and surface defects in wire cut electric discharge machining,
No full textOptimizing the energy consumption and minimization of surface defects in wire cut electric discharge machining (WEDM) at the experimental design effectively saves energy and improves quality of machining. The present study is aimed to reduce energy consumption and improve machine performance related to kerf width, metal removal rate and surface quality in WEDM of Al-Si metal matrix composite. Current, pulse on time, pulse off time, voltage and wire tension are considered as controllable parameters and optimized using graph theory and utility concept (GTUC) and teaching learning based optimization (TLBO) algorithm considering criteria for the performance characteristics. It is observed that 26% of the additional energy is consumed in GTUC method while 40% less energy is consumed in TLBO method; the kerf width is found to
be 8.4% more in GTUC and 2.8% less in TLBO respectively; the MRR is found to be 40.2% and 43.2% less in GTUC and TLBO methods respectively; 72.8% of the excess surface roughness is found in GTUC method while 1.2% less surface roughness is found in TLBO method. Effect of process parameters on the performance characteristics is also analyzed and the current is found to be dominant parameter. At TLBO optimized
working condition, surface defects around kerf are found minimum
Simulation Of Shank-Foot 2-Dof Manipulator With Computed Torque Control For Trajectory Generation
No full textExoskeletons and external assistive devices for human locomotion plays an predominant role in now a days. To assist elderly people and injured content, a shank foot manipulator is modelled and analysed. This shank foot manipulator is a 2 degree of freedom link which is represented by dynamic equation of non linear differential equation. Numerical solution is employed to obtain the closed form solutions. The trajectory generated by the manipulator is discussed with the control strategies like computed torque control with the use of MATLAB. Due to the uncertainties and non linearity nature, it becomes complex to attain the motion control in a accurate position. With the ease of computed torque control, the manipulator is made to be in a desired position
Characterization Of Materials For Customized Afo Using Additive Manufacturing
No full textNeurodegenerative conditions and compressed nerves often cause an abnormal foot drop that affects an individual gait and make it difficult to walk normally. Ankle Foot Orthosis (AFO) is the medical device which is recommended for the patients to improve the walking ability and decrease the risk of falls. Custom AFOs provide better fit, comfort and performance than pre-manufactured ones. The technique of 3D-printing is suitable for making custom AFOs. Fused deposition modelling (FDM) is a 3D-printing method for custom AFO applications with the
desired resistance and material deposition rate. Generally, FDM is a thermal process; therefore materials thermal behaviour plays an important role in optimizing the performance of the printed parts. The objective of this study is to evaluate the
thermal behaviour of PLA, ABS, nylon and WF-PLA filaments before manufacturing the AFO components using the FDM method. In the study, the sequence of testing materials provides a basic measuring method to investigate AFO device parts
thermal stability. Thermal analysis (TG/DTG and DSC) was carried out before 3D printing is to characterize the thermal stability of each material
Assessing the effect of FDM processing parameters on mechanical properties of PLA parts using Taguchi method
No full textFused deposition modeling (FDM) is a fast-expanding additive manufacturing technique for fabricating various polymer components in engineering and medical applications. The
mechanical properties of components printed with the FDM method are influenced by several process parameters. In the current work, the influence of nozzle temperature, infill density, and printing speed on the tensile properties of specimens printed using polylactic acid (PLA) filament was investigated. With an objective to achieve better tensile properties including elastic modulus, tensile strength, and fracture strain; Taguchi
L8 array has been used for framing experimental runs, and eight experiments were conducted. The results demonstrate that the nozzle temperature significantly influences the tensile properties of the FDM printed PLA products followed by infill density. The optimum processing parameters were determined for the FDM printed PLA material at a nozzle temperature of 220C, infill density of 100%, and printing speed of 20 mm/s
Alternative air conditioning system designs for a low moisture load application with emphasis on a hybrid desiccant cooling cycle
No full textThis thesis was scanned from the print manuscript for digital preservation and is copyright the author.
Researchers can access this thesis by asking their local university, institution or public library to
make a request on their behalf. Monash staff and postgraduate students can use the link in the References field
Assessing the effect of FDM processing parameters on mechanical properties of PLA parts using Taguchi method
No full textFused deposition modeling (FDM) is a fast-expanding additive manufacturing technique for fabricating various polymer components in engineering and medical applications. The
mechanical properties of components printed with the FDM method are influenced by several process parameters. In the current work, the influence of nozzle temperature,
infill density, and printing speed on the tensile properties of specimens printed using polylactic acid (PLA) filament was investigated. With an objective to achieve better
tensile properties including elastic modulus, tensile strength, and fracture strain; Taguchi L8 array has been used for framing experimental runs, and eight experiments were conducted. The results demonstrate that the nozzle temperature significantly influences the tensile properties of the FDM printed PLA products followed by infill density. The optimum processing parameters were determined for the FDM printed PLA material at a nozzle temperature of 220C, infill density of 100%, and printing speed of 20 mm/s
Tube-like natural halloysite/poly(tetrafluoroethylene) nanocomposites: simultaneous enhancement in thermal and mechanical properties
No full textIn the current study, PTFE (polytetrafluroethylene) matrix is reinforced with different wt% (2%-10%) of Halloysite nanotubes (HNTs). PTFE samples are fabricated with 2 wt% increment and are designated from `B'to `F' and designation `A' refers to neat PTFE. Thermal and mechanical characterization of the fabricated composites is studied. The calorimetric measurements showed enhanced degree of crystallinity of the nanocomposites, which is from 57.83% to 74.7%. The dynamic mechanical analysis results have shown enhanced storage modulus and loss modulus and reduced damping behaviour, without affecting glass transition temperature. Moreover, significant improvements in mechanical properties are observed from the experimental results. The results are discussed and validated with the existing literature. The phase and the fracture morphology of the nanocomposites is studied using scanning electron microscope and discussed herein
