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- 저자 : Jebaraj, T. (검색결과 6 건)
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End milling of DIN 1.2714 die steel with cryogenic CO2 cooling
Jebaraj M.,Pradeep Kumar M. 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.5
Currently, cryogenic coolants are used instead of normal cutting fluid in transferring excessive heat from the cutting region and retaining cutting tool edge sharpness during the machining process, and to eliminate the hazardous effects of cutting fluids. In this investigation, end milling experiments with various cooling approaches were performed on DIN 1.2714 die steel using titanium aluminum nitratecoated carbide tool inserts under dry, conventional coolant, and cryogenic CO 2 environments. The end milling performance under CO 2environment has been compared with those under dry and wet conditions regarding cutting temperature (T c ), feed force (F x ), normal force (F y ), axial force (F z ), surface roughness (R a ), tool wear, surface and chip morphology, and residual stress. The consequences of these machining environments were evaluated. Using cryogenic CO 2 cooling technique reduced the T c values by approximately 50.49 % and 64.42 % compared with those of wet and dry conditions, respectively. Similarly, CO 2 cooling diminished the cutting forces, namely, F x , F y and F z . As a result, R a values reduced by approximately 59.81 % and 67.15 % compared with those of wet and dry conditions, respectively. Cryogenic CO 2 caused a significant reduction in surface damage and abrasion wear in the machined surfaces and cutting inserts, respectively. No substantial changes in residual stress were observed at the cut surfaces.
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Jebaraj Ida,S. Austin Suthanthiraraj 한국고분자학회 2019 Macromolecular Research Vol.27 No.4
The present study reports on the performance of organic nitrogenous compound namely, benzotriazole (BTZ) in polyethylene oxide (PEO)- poly(methylmethacrylate) matrix in conjunction with potassium iodide and iodine as a blended polymer electrolyte and its application in TiO2 nanocrystalline solar cells. On comparison of electrical conductivity between five different compositions of benzotriazole, polymer matrix with 0.005 M of benzotriazole exhibited the best ionic conductivity with 1×10-5 Scm-1. The photochemical properties of the best conducting sample showed an open circuit voltage (Voc) of 7.4 V, short circuit current density ( Jsc) of 6.74 mA, fill factor of 0.73 and efficiency (η) of 3.6%. The structural modifications in these doped polymer electrolyte were analysed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The complex impedance and dielectric analyses were carried out to completely understand the relevent ion conduction mechanism.
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A. P. Santhakumaran,T. Jebaraj,S. V. Ullas Chandran 한국전산응용수학회 2012 Journal of applied mathematics & informatics Vol.30 No.5
For a connected graph G of order n, an ordered set S ={u1, u2, . . . , uk} of vertices in G is a linear edge geodetic set of G if for each edge e = xy in G, there exists an index i, 1 ≤ i < k such that e lies on a ui − ui+1 geodesic in G, and a linear edge geodetic set of minimum cardinality is the linear edge geodetic number leg(G) of G. A graph G is called a linear edge geodetic graph if it has a linear edge geodetic set. The linear edge geodetic numbers of certain standard graphs are obtained. Let gl(G) and eg(G) denote the linear geodetic number and the edge geodetic number, respectively of a graph G. For positive integers r, d and k ≥ 2with r < d ≤ 2r, there exists a connected linear edge geodetic graph G with rad G = r, diam G = d, and gl(G) = leg(G) = k. It is shown that for each pair a, b of integers with 3 ≤ a ≤ b, there is a connected linear edge geodetic graph G with eg(G) = a and leg(G) = b.
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Santhakumaran, A.P.,Jebaraj, T.,Ullas Chandran, S.V. The Korean Society for Computational and Applied M 2012 Journal of applied mathematics & informatics Vol.30 No.5
For a connected graph G of order $n$, an ordered set $S=\{u_1,u_2,{\cdots},u_k\}$ of vertices in G is a linear edge geodetic set of G if for each edge $e=xy$ in G, there exists an index $i$, $1{\leq}i$ < $k$ such that e lie on a $u_i-u_{i+1}$ geodesic in G, and a linear edge geodetic set of minimum cardinality is the linear edge geodetic number $leg(G)$ of G. A graph G is called a linear edge geodetic graph if it has a linear edge geodetic set. The linear edge geodetic numbers of certain standard graphs are obtained. Let $g_l(G)$ and $eg(G)$ denote the linear geodetic number and the edge geodetic number, respectively of a graph G. For positive integers $r$, $d$ and $k{\geq}2$ with $r$ < $d{\leq}2r$, there exists a connected linear edge geodetic graph with rad $G=r$, diam $G=d$, and $g_l(G)=leg(G)=k$. It is shown that for each pair $a$, $b$ of integers with $3{\leq}a{\leq}b$, there is a connected linear edge geodetic graph G with $eg(G)=a$ and $leg(G)=b$.
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THE CONNECTED DOUBLE GEODETIC NUMBER OF A GRAPH
SANTHAKUMARAN, A.P.,JEBARAJ, T. The Korean Society for Computational and Applied M 2021 Journal of applied mathematics & informatics Vol.39 No.1
For a connected graph G of order n, a set S of vertices is called a double geodetic set of G if for each pair of vertices x, y in G there exist vertices u, v ∈ S such that x, y ∈ I[u, v]. The double geodetic number dg(G) is the minimum cardinality of a double geodetic set. Any double godetic set of cardinality dg(G) is called a dg-set of G. A connected double geodetic set of G is a double geodetic set S such that the subgraph G[S] induced by S is connected. The minimum cardinality of a connected double geodetic set of G is the connected double geodetic number of G and is denoted by dgc(G). A connected double geodetic set of cardinality dgc(G) is called a dgc-set of G. Connected graphs of order n with connected double geodetic number 2 or n are characterized. For integers n, a and b with 2 ≤ a < b ≤ n, there exists a connected graph G of order n such that dg(G) = a and dgc(G) = b. It is shown that for positive integers r, d and k ≥ 5 with r < d ≤ 2r and k - d - 3 ≥ 0, there exists a connected graph G of radius r, diameter d and connected double geodetic number k.
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R. Joseph Bensingh,S. Rajendra Boopathy,C. Jebaraj 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.11
The profile of a bi-aspheric lens is such a way that the thickness narrows down from center to periphery (convex). Injection molding of these profiles has high shrinkage in localized areas, which results in internal voids or sink marks when the part gets cool down to room temperature. This paper deals with the influence of injection molding process parameters such as mold surface temperature, melt temperature, injection time, V/P Switch over by percentage volume filled, packing pressure, and packing duration on the volumetric shrinkage and deflection. The optimal molding parameters for minimum variation in volumetric shrinkage and deflection of bi-aspheric lens have been determined with the application of computer numerical simulation integrated with optimization. The real experimental work carried out with optimal molding parameters and found to have a shallow and steep surface profile accuracy of 0.14 and 1.57 mm, 21.38-45.66 and 12.28-26.90 µm, 41.56-157.33 and 41.56-157.33 nm towards Radii of curvatures (RoC), surface roughness (Ra) and waviness of the surface profiles (profile error Pt), respectively.
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