Qualification: 
M.Tech
l_mahadevan@cb.amrita.edu

Mahadevan Lakshmanan currently serves as Assistant Professor at the Department of Mechanical Engineering, Amrita School of Engineering, Coimbatore Campus. He pursued his MTech in Engineering Design in 2010 from Amrita Vishwa Vidyapeetham. His areas of research include Mechanics and Mechanical Behavior of Composite Structures, Experimental Stress Analysis, Characterization of Polymer Nano Composites.

Publications

Publication Type: Journal Article

Year of Publication Title

2019

A. Padanattil, Lakshmanan, M., Dr. Jayanarayanan K., and Dr. Mini K. M., “Strengthening of Plain Concrete Cylinders with Natural FRP Composite Systems”, Iranian Journal of Science and Technology, Transactions of Civil Engineering, pp. 1-9, 2019.[Abstract]


This paper reports the performance of plain concrete cylinders confined externally with fiber-reinforced polymer (FRP) composites with natural sisal as the reinforcement. Strength tests are performed on plain concrete cylinders confined with different sisal FRP thicknesses such as 1, 2 and 3 layers. The results show that external confinement with sisal FRP enhanced the axial load-carrying capacity, ductility and energy absorption of concrete compared to control specimens. For predicting the ultimate strength of sisal FRP-confined concrete a new strength equation was developed based on the lateral confining pressure of sisal FRP which shows a good agreement with the experimental results. To assess the durability criteria, sisal FRP-filled concrete specimens are exposed to severe environmental factors such as variation in temperature, alternate wet and dry cycling and exposure to alkaline condition. The outcomes indicate that sisal FRP-confined specimen subjected to temperature variation has shown a remarkable increase in strength, whereas alkaline exposure has exhibited a decrease in strength.

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2018

E. Parvathi, Lakshmanan, M., and Dr. Mini K. M., “Strengthening Steel Members with Holes Under Tension Using Unidirectional GFRP Sheets”, International Journal of Steel Structures, vol. 18, no. 2, pp. 496-511, 2018.[Abstract]


Steel structure sections are often connected using bolts and rivets, which necessitates the need for holes. These holes provide a zone of failure during loading. In the present work an attempt is made to strengthen the steel members under tensile loading with hole provision for bolts, using Glass Fiber Reinforced Polymer (GFRP) sheets. The performance of FRP wrapping is assessed by changing the angle of orientation of fiber. The experimental investigation is conducted for one hole, two hole and staggered hole arrangement and the results are compared with finite element analysis. The difference between experiment and finite element modeling are within allowable limits. From the study it is found that GFRP wrapping with 0° orientation of fiber is the most suitable in terms of ultimate strength for all the three hole configurations. © 2018, Korean Society of Steel Construction.

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2017

B. L. P. Dheeraj Swamy, Raghavan, V., Srinivas, K., K Rao, N., Lakshmanan, M., Dr. Jayanarayanan K., and Dr. Mini K. M., “Influence Of Silica Based Carbon Nano Tube Composites In Concrete”, Advanced Composites Letters, vol. 26, no. 1, pp. 12-17, 2017.[Abstract]


This study focuses on the utilization of highly densified materials in cementitious composites with objectives of improving the mechanical performance and minimizing the number and size of defects. Due to their excellent mechanical properties, carbon nanotubes (CNTs) are now viewed as potential candidate for reinforcement in cement composites. The present paper reports the use of carbon nanotubes (CNTs) as reinforcement to improve the mechanical properties of portland cement paste and creating multifunctional concrete. In order to increase the bonding, and strength, a material with intermediate fineness, highly densified silica fumes, was also utilized. The densified silica fumes along with CNT are added to cement mortar in various proportions. Small-scale specimens were prepared to measure the mechanical properties as a function of nanotube concentration and distribution. Furthermore, properties like shrinkage, permeability and alkalinity of the resultant composite were also investigated. The study addresses the significance of CNT as an additive to the enhancement of properties of cement composite. More »»

2017

A. Padanattil, Lakshmanan, M., and Dr. Mini K. M., “Strengthening of plain concrete cylinders with natural sisal FRP composite systems”, International Journal of Earth Sciences and Engineering, 2017.

2015

B. L. P. Dheeraj Swamy, Raghavan, V., Srinivas, K., K Rao, N., Lakshmanan, M., and Dr. Mini K. M., “Study on Silica Based Carbon Nano Tube Cement Composites’ International Journal of Earth Sciences and Engineering”, International Journal of Earth Sciences and Engineering, 2015.

2015

R. Reghunath, Lakshmanan, M., and Mini, K. M., “Low velocity impact analysis on glass fiber reinforced composites with varied volume fractions”, IOP Conference Series: Materials Science and Engineering, vol. 73, no. 1, 2015.[Abstract]


This paper presents an experimental study to assess the impact response of bidirectional woven type of glass fiber reinforced composite material with varied volume fractions and hence to find out the optimal volume fraction which gives better impact resistance. The specimens are prepared using vacuum bagging process and the volume fraction is estimated by resin burn off method. For getting information regarding surface topography of the impacted specimen, scanning electron microscopy is conducted. The study is done by slightly varying the velocities and it is found that a volume fraction of 43 -44% gives a better impact resistance which is also confirmed by the scanning electron microscopy test. From the SEM results it is observed that matrix cracking, fiber breakage, debonding and fiber pull out are the major modes of failure during the impact, which reduces the structural strength and stability of the structure.

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2012

Dr. Mini K. M., Lakshmanan, M., Mathew, L., and Kaimal, G., “Effect of volume fraction on stability analysis of glass fibre reinforced composite plate”, Steel & Composite structures , vol. 12, no. 2, pp. 117-127, 2012.[Abstract]


This paper deals with an experimental investigation to study the effect of fibre content on the stability of composite plates with various aspect ratios. Epoxy based glass fibre reinforced composite plates with aspect ratio varying from 0.4 to 1 and with volume fractions of 0.36, 0.4, 0.46, 0.49 and 0.55 are used for the investigation. From the study it is observed that for plate with aspect ratio of 0.5 and 0.4 there is no buckling and the plate got crushed at the middle. As the volume fraction increases the buckling load also increases to a limit and then began to reduce with further increase in fibre content. The optimum range of fibre content for maximum stability is found between 0.49 and 0.55. Polynomial expressions are developed for the study of buckling behaviour of composite plates with different volume fractions in terms of load and aspect ratio. More »»

2012

Dr. Mini K. M., Lakshmanan, M., Mathew, L., and Mukundan, M., “Effect of fibre volume fraction on fatigue behaviour of glass fibre reinforced composite”, Fatigue & Fracture of Engineering Materials & Structures, Wiley Publishing Ltd., vol. 35, no. 12, pp. 1160–1166, 2012.[Abstract]


The aim of this paper is to study the fatigue behavior of GFRP composites manufactured by vacuum bagging process by varying the volume fraction. Constant‐amplitude flexural fatigue tests were performed at zero mean stress, i.e. a cyclic stress ratio R=−1 by varying the frequency of the testing machine. The relationship between stiffness degradation rate and fibre volume fraction, was observed, and the influence of volume fraction on the tensile strength was also investigated. The results show that, as the volume fraction increases the stiffness degradation rate initially decreases and then increases after reaching a certain limit for the volume fraction. Graph between volume fraction and Young's modulus shows that as the volume fraction increases Young's modulus also increases and reaches a limit and then it decreases with further increase in volume fraction, due to the increase in fibre content which changes the material properties of the composite material. The obtained results are in agreement with the available results.

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Publication Type: Conference Paper

Year of Publication Title

2013

K. M. Mini, Lakshmanan, M., and Midhun, R., “Effect of Fiber orientation on Fracture Toughness of Glass/Epoxy and Carbon/Epoxy Composites”, in Indian Conference on Applied Mechanics (INCAM) , IIT, Madras, 2013.[Abstract]


Most of machine elements consist of discontinuities where it is necessary to consider stress distributions from fracture mechanics point of view. In the present work fracture toughness of unidirectional carbon fiber reinforced laminates (CFRP) and glass fiber reinforced laminates (GFRP) with
different fiber orientation angles and single edge notch configurations perpendicular to loading direction are investigated experimentally . Fracture toughness is calculated by determining failure loads and best fiber configuration for fracture toughness is found to be [0/15]s. Studies are extended to investigate the variation in fracture toughness of [0/15]s configuration under the influence of nano particles like CNT.

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2012

R. Reghunath, Lakshmanan, M., and .M.Mini, K., “Impact studies on glass fiber reinforced composite materials with different volume fraction”, in International Conference on Materials Science and Technology (ICMST 2012) - Department of Physics, St. Thomas College, Pala, Kottayam, Paper No. 217., Department of Physics, St. Thomas College, Pala, Kottayam, 2012.

2012

M. Lakshmanan, Mini, K. M., and Reghunath, R., “Low Velocity Impact Studies on GFRP composites with different volume fractions”, in Eleventh ISAMPE NationalConference on Composites (INCCOM-11), Amrita Vishwa Vidyapeetham, Coimbatore, 2012.[Abstract]


This paper presents an experimental study to assess the impact response of bidirectional woven type of glass fiber reinforced composite material with varied volume fractions and hence to find out the optimal volume fraction which gives better impact resistance. The specimens are prepared using vacuum bagging process and the volume fraction is estimated by resin burn off method. For getting information regarding surface topography of the impacted specimen, scanning electron microscopy is conducted. The study is done by slightly varying the velocities and it is found that a volume fraction of 43 -44% gives a better impact resistance which is also confirmed by the scanning electron microscopy test. From the SEM results it is observed that matrix cracking, fiber breakage, debonding and fiber pull out are the major modes of failure during the impact, which reduces the structural strength and stability of the structure.

More »»

2009

M. Lakshmanan, Mini, K. M., and Subramanian, K., “Stability of Composite Plates- a Study Using Artificial Neural Networks”, in International Conference on “Operations Research applications in Engineering and Management (ICOREM), Anna University, Tiruchirappali, 2009.