Qualification: 
Ph.D, M.Tech, B-Tech
hariprasadmp@am.amrita.edu

Dr. Hariprasad M. P. currently serves as Assistant Professor at the Department of Mechanical Engineering, School of Engineering, Amrita Vishwa Vidyapeetham, Amritapuri. Dr. Hariprasad received his Ph.D. in Applied Mechanics from Indian Institute of Technology (IIT) Madras. His primary area of doctoral research was in the field of optical methods in experimental stress analysis, with an emphasis on contact mechanics, digital photoelasticity (polarised light-based non-destructive stress measurement) and image correlation techniques. He was awarded the Institute Pre-Doctoral Fellowship by the Indian Institute of Technology Madras for the accomplishments in doctoral research.

In 2015, Dr. Hariprasad was selected from a national wide competitive process to represent in a team of Indian researchers to participate in Summer Institute in Optical Sensing Technologies at the University of Toronto, Canada. His areas of research include Optical Methods in Experimental Stress Analysis, Mechanics of Auxetic Structures and Contact Mechanics.

Workshops/Conferences Attended 

  1. Society of Experimental Mechanics XIII International Congress and Exposition on Experimental and Applied Mechanics. June 6-9 2016. Hilton Orlando Florida. USA 
  2. Summer Institute in Optical Sensing Technologies at University of Toronto, Canada, June 14-19, 2015 
  3. International Conference on Experimental Mechanics ICEM2014, SPIE, Singapore 15-17 Nov. 2014 
  4. Workshop on ‘CT scanning, MIMICS and 3D Printing’ organised by Ragas Dental College and General Hospital, 9-10 Dec 2014, Chennai, India. 
  5. International symposium on advanced science and technology in experimental mechanics, Organized by Japanese Society of Experimental Mechanics. New Delhi, India, 1 - 6 November 2014 
  6. International Conference on Computer Aided Engineering (CAE-2013), IIT Madras 
  7. Indian Conference on Applied Mechanics organised by the Dept. of Applied Mechanics, IIT Madras, 4 – 6 July 2013.

Publications

Publication Type: Journal Article

Year of Publication Title

2019

Harsh Mohan, G. Manoj Reddy, Vinod Kumar Gopal, and Hariprasad M. P., “Study on PV Thermal Integrated systems for Rooftop Applications”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012145, 2019.[Abstract]


Around 90% of the total solar wafers produced and deployed around the globe is primarily based either on mono or polycrystalline silicon cells. Majority of these are deployed for converting incoming insolation directly to electrical energy and are termed as photovoltaic systems (PV). Another application is to convert the incoming solar energy into thermal energy and termed as Thermal systems (T). The vital components for both the above conversions are their respective solar energy collection systems. As the temperature rises, the conversion efficiency of solar cells decreases. This is due to the fact that with increase in temperature, there will be a reduction in the mobility of charge carriers. When deployed in field, photovoltaic cells will heat up rapidly as they are good heat absorbers. In storage integrated solar installations, heat is considered as killer of all batteries and encapsulate. The work aims at design and development of an integrated PV thermal solar system to efficiently utilise the incoming solar energy. An efficient heat exchanger mechanism will help bringing in possibility of having a storage integrated solar module so that the final solution will have generation, storage and thermal evacuation in the same laminate. The integrated model when implemented gives enough room and a lower temperature chamber, where the batteries could be easily integrated without loss of cycle life and AH capacity loss.

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2018

Hariprasad M. P. and Ramesh K., “Analysis of contact zones from whole field isochromatics using reflection photoelasticity”, Optics and Lasers in Engineering , vol. 105, pp. 86 - 92, 2018.[Abstract]


This paper discusses the method for evaluating the unknown contact parameters by post processing the whole field fringe order data obtained from reflection photoelasticity in a nonlinear least squares sense. Recent developments in Twelve Fringe Photoelasticity (TFP) for fringe order evaluation from single isochromatics is utilized for the whole field fringe order evaluation. One of the issues in using TFP for reflection photoelasticity is the smudging of isochromatic data at the contact zone. This leads to error in identifying the origin of contact, which is successfully addressed by implementing a semi-automatic contact point refinement algorithm. The methodologies are initially verified for benchmark problems and demonstrated for two application problems of turbine blade and sheet pile contacting interfaces.

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2018

Hariprasad M. P., Ramesh K., and Bhagyashree C. Prabhune, “Evaluation of Conformal and Non-Conformal Contact Parameters Using Digital Photoelasticity”, Experimental Mechanics , vol. 58, no. 8, pp. 1249 - 1263, 2018.[Abstract]


Experimental studies to exploit photoelastic data of conformal geometries to extract contact parameters are non-existent because closed-form stress field equations were not available until recently. In this paper, the explicit equations recently reported in the literature for a flat punch with rounded edges are generalized so that a single set of equations can be used for a flat punch with rounded edges and Hertzian contacts with arbitrary radii of curvatures. The generality of the governing equations is verified by plotting isochromatics for conformal and non-conformal contact situations. A generic method to evaluate unknown contact parameters from the whole-field isochromatic data for conformal and non-conformal geometries is implemented. The methodology is initially verified using theoretically generated isochromatic data and is then used to experimentally evaluate two contact situations. In view of high-fringe gradient zones, the suitability of various digital photoelastic methods is compared. A novel four-step phase shifting technique is proposed in which isochromatic and isoclinic data can be evaluated using the minimum number of images.

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2017

Hariprasad M. P. and Ramesh K., “Evaluation of Hertzian contact parameters from whole field displacement data”, The Journal of Strain Analysis for Engineering Design, vol. 52, no. 7, pp. 403-409, 2017.[Abstract]


Evaluation of contact parameters in Hertzian contact from displacement data is studied. Based on complex potential approach, generic explicit equations for displacement field in the vicinity of the contact zones are presented. Methodology for evaluating unknown contact parameters and associated rigid body displacements from the whole field experimental displacement data is implemented using an over-deterministic system of equations in a least squares sense. Usefulness of this method in dealing different contacting geometries is brought out by analyzing different contacting situations using digital image correlation.

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2016

Ramesh K., Hariprasad M. P., and Bhuvaneswari Shanmugam, “Digital photoelastic analysis applied to implant dentistry”, Digital optical & Imaging methods in structural mechanics, vol. 87, pp. 204 - 213, 2016.[Abstract]


Development of improved designs of implant systems in dentistry have necessitated the study of stress fields in the implant regions of the mandible/maxilla for better understanding of the biomechanics involved. Photoelasticity has been used for various studies related to dental implants in view of whole field visualization of maximum shear stress in the form of isochromatic contours. The potential of digital photoelasticity has not been fully exploited in the field of implant dentistry. In this paper, the fringe field in the vicinity of the connected implants (All-On-Four® concept) is analyzed using recent advances in digital photoelasticity. Initially, a novel 3-D photoelastic model making procedure, to closely mimic all the anatomical features of the human mandible is proposed. By choosing appropriate orientation of the model with respect to the light path, the essential region of interest were sought to be analysed while keeping the model under live loading conditions. Need for a sophisticated software module to carefully identify the model domain has been brought out. For data extraction, five-step method is used and isochromatics are evaluated by twelve fringe photoelasticity. In addition to the isochromatic fringe field, whole field isoclinic data is also obtained for the first time in implant dentistry, which could throw important information in improving the structural stability of the implant systems. Analysis is carried out for the implant in the molar as well as the incisor region. In addition, the interaction effects of loaded molar implant on the incisor area are also studied.

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2015

Ramesh Krishnamurthi, Hariprasad M. P., and Vivek Ramakrishnan, “Robust multidirectional smoothing of isoclinic parameter in digital photoelasticity”,  Optical Engineering, vol. 54, no. 8, 2015.[Abstract]


In digital photoelasticity, one gets full-field information about the difference in principal stresses and their orientations by postprocessing the intensity data. Isoclinic data obtained using phase shifting techniques have inherent noise. The higher the external load, the higher the noise. Further, noise removal becomes complex if the isoclinic data has π-jumps, isotropic points, etc. Initially, the origin of the noise in isoclinic data obtained using phase shifting techniques is discussed. An explanation for the presence of excessive noise in a circular polariscope-based algorithm is provided. Three methods for noise removal of isoclinic data calculated using a plane polariscope are proposed using an outlier smoothing algorithm. The first two use quality and standard deviation measures to identify the noise-free pixel from each individual scan. The last method involves progressive multidirectional smoothing. The effectiveness of the proposed smoothing schemes is demonstrated using the benchmark problem of a circular disc under diametral compression. Multidirectional progressive smoothing is found to be effective in removing the noise at lower as well as at higher loads. Finally, this scheme is used to smooth isoclinic data in two other problems, one that has a π-jump and the other that has both an isotropic point and a π-jump.

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Publication Type: Conference Paper

Year of Publication Title

2019

Arjun Ajit Kottara, Govind Padmanabhan, Maneesh Kumar M., Rohit K., and Hariprasad M. P., “Revisit on the Analytic Formulations of Principal Stress Orientation in Fracture Mechanics”, in 4th International Conference on Advances in Material and Manufacturing Applications-IConAMMA 2019, 2019.

2019

Shammo Dutta, Hrishikesh G. Menon, Hariprasad M. P., Aravind Krishnan, and Balakrishnan Shankar, “Study of Auxetic beams under bending: A Finite Element Approach”, in 2nd International Mechanical Engineering Congress – IMECH 2019, NIT Trichy, 2019.

2017

Hariprasad M. P. and Ramesh K., “Contact Zone Evaluation of Dental Implants Using Digital Photoelasticity”, in Mechanics of Biological Systems and Materials Volume 6: Proceedings of the Society for Experimental Mechanics Series, 2017.[Abstract]


Use of dental implants in case of missing natural dentition is now common in clinical dentistry. The tilted implant configurations, which are inevitable in many clinical situations, are prone to higher stresses. The orientation of implants has a great influence on its structural integrity as high stresses around the implants adversely affect the osseointegration process and eventually fail due to the bone resorption. Hence, complete understanding of such complex systems demand better understanding of the bio-mechanics involved. Photoelasticity, a whole-field optical technique, is the right choice for analysing such implant configurations. Recent advancements in digital photoelasticity make it possible to evaluate isochromatics as well as isoclinic parameters over the entire model domain with considerable accuracy. However, these techniques have not been exploited in the field of implant dentistry and photoelasticity has been mostly used as a visualisation tool. This paper explores the use of modern photoelastic techniques for analysing the stress distribution due to an implant with an inclination of 15°. Further, this work also studies the high stress zones in the coronal region of this angled implant. The isochromatic data is post processed using least squares method for determining the contact parameters such as effective contact length and frictional coefficient.

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2017

Hariprasad M. P., Bhagyashree C. Prabhune, and Ramesh K., “Simulation of Whole Field Isochromatics of Contact Zones Involving Conformal Geometries Using Complex Potential Approach”, in Indian Conference on Applied Mechanics (INCAM), (2017), 2017.

2016

Hariprasad M. P. and Ramesh K., “Effect of residual birefringence in contact stress parameter evaluation using digital photoelasticity”, in International conference of Processes in Combined Digital Optical and Imaging Methods applied to Mechanical Engineering, Monte Verita, Locarno, 2016.

2014

Hariprasad M. P. and K. Renganathan, “Nonlinear Viscoelastic Stress Analysis of a Circular Perforated Solid Booster Propellant Grain for Vertical Storage”, in HEMCE 2014, Vikram Sarabhai Space Centre, Thiruvananthapuram, 2014.

2014

Hariprasad M. P., Bhuvaneswari Shanmugam, Ramesh K., Paul Simon, and Jayashree Mohan, “Evolution of Suitable Photoelastic Model in Implant Dentistry”, in 9th International symposium on advanced science and technology in experimental mechanics, New Delhi, India, 2014.

2014

Hariprasad M. P., Vivek Ramakrishnan, and Ramesh K., “New Initiatives in the smoothing of Digital Photoelastic Data”, in 9th International symposium on advanced science and technology in experimental mechanics,, Delhi, 2014.

2014

Iqbal Baig, Ramesh K., and Hariprasad M. P., “Analysis of Stress Distribution in Dry Masonry Walls Using Three Fringe Photoelasticity”, in Proc. SPIE 9302, International Conference on Experimental Mechanics 2014, 93022P, 2014.[Abstract]


Masonry being a composite system is very complex to study with analytical methods alone. Quantitative digital photoelastic analysis using Three Fringe Photoelasticity (TFP) is carried out on a model of a dry masonry wall with bricks made up of epoxy, loaded with a concentrated load. The result obtained provides insight into the micromechanics of force transmission and interactions between bricks in masonry. The result shows that force transmission through the wall occurs at discrete points. A tree like hierarchical pattern of stress flow is observed. It is also observed that the stress percolation results in the existence of stress-free zones in the model domain. © (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

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2013

Hariprasad M. P. and K. Renganathan, “Nonlinear Viscoelastic Stress Analysis of Star Perforated Solid Booster Propellant Grain”, in Indian Conference on Applied Mechanics (INCAM) 2013, IIT Madras, 2013.

2013

Dr. Ajith Ramesh, Hariprasad M. P., and K. Renganathan, “Nonlinear Visco-Elastic Stress Analysis of a Circular Perforated Solid Propellant Grain”, in International conference on Computer Aided Engineering (CAE), IIT-Madras, Chennai, 2013.