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Investigation of the effect of micro-fillers on Viscoelastic and Erosion wear Characteristics of PTFE composites

Authors:

Gamini Suresh, Lakshmi Srinivas Ch, M Chandra Sekhar

DOI NO:

https://doi.org/10.26782/jmcms.2020.07.00061

Abstract:

Polytetrafluorethylene (PTFE)is one type of the most prominent semi-crystalline engineering thermo-plastics. The functional properties of PTFE are enhanced with the addition of micro-fillers inorder to increase the utility of the composites. In the current work, three types of industrial Teflon composites with micro-fillers viz. 25% by weight of glass fibers, 25% by weight of carbon fibers, and 25% by weight of graphite along with neat PTFE were used to investigatethe viscoelastic and erosion wear characteristics. From the Dynamic Mechanical Analysis (DMA) graphs, it was observed that PTFE with 25% by weight of GF has shown peak viscoelastic characteristicsinthree-point bending mode. The viscoelastic properties such asstorage modulus of 1 GPa, loss modulus of 84 MPa and a tand of 0.137 respectively at 1400 C were observed from the DMA plots for the sample (PTFE+25%GF).Also, the erosion wear behavior of the same sample has shown good resistance at 1.5 bar and 90o impingement angle respectively due to the addition of glass fiber micro-filler.

Keywords:

PTFE composites,glass fibers,carbon fibers,graphite,viscoelastic properties,erosion wear,

Refference:

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HIGH CAPACITY REVERSIBLE DATA HIDING SCHEME WITH INTERPOLATION AND THRESHOLD-BASED BIT ALLOCATION TECHNIQUE

Authors:

M. Mahasree, N. Puviarasan, P. Aruna

DOI NO:

https://doi.org/10.26782/jmcms.2020.07.00062

Abstract:

Secret communication through lossless data hiding techniques is an active research field where payload management is a challenging task. The tradeoff between stego quality and payload capacity generally exists in such fields. To achieve higher payload, interpolation based data hiding techniques (IRDH) are opted in several areas including e-governance, military imagery, medical imaging systems etc. The purpose of interpolation in hiding systems is to provide better hiding capacity without altering the original pixels. Conventional interpolation-based hiding techniques lack in providing high embedding capacity due to some restrictions in embedding rules. Thus, this paper encompasses an effective embedding procedure for interpolation based reversible data hiding schemes to fulfill the capacity requirement. The objective of our proposed scheme is to increase the payload capacity by making use of all interpolated pixels in the cover image with good visual quality. Particularly, the proposed Threshold-based Bit Allocation (TBA) technique efficiently assigns the number of bits that can be embedded in an interpolated pixel. Experimental results show that the proposed interpolation based reversible data hiding technique performs better than many state-of-the-art methods in terms of hiding capacity as well as visual quality.

Keywords:

Lossless Data Hiding,Interpolation based Reversible Data Hiding (IRDH),payload capacity,stego quality,Threshold-based Bit Allocation (TBA),

Refference:

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