Next Frontiers in the Dynamic Mechanical Analysis of Viscoelastic Materials
Characterization of viscoelastic materials, such as polymers, composites and biomaterials, is a complex process due to the temperature and strain rate dependence of their properties. The present talk will discuss the possibility of extracting elastic constants such as Poisson ratio from the viscoelastic properties, reducing the experimental campaign by applying sampling and machine learning methods, and trends in measured properties of materials.
Typically, the methods used to calculate Poisson ratio can be classified in direct methods which directly measure the change of the dimensions of the specimen and indirect methods from which the measurement of two moduli like shear modulus and Young’s modulus. The contribution highlights a novel torsional-axial dynamic mechanical analyzer (MCR 702 MultiDrive) which can use a linear and a rotational measuring drive in one instrument and which enables the determination of complex Young’s modulus |E*| as well as the complex shear modulus |G*| with a single sample in a continuous measurement run.
The novel capabilities provided by the MultiDrive device also include integration of a camera for strain measurement using digital image correlation (DIC). These capabilities allow measurement of Poisson’s ratio from both direct and indirect methods as a function of temperature and frequency and generate accurate results on elastic constants of the material. These new capabilities will help in accelerating the materials design process for many applications, which is becoming increasingly complex due to the stringent requirements on mechanical properties.
Instructor: Dr. Abhi Shetty, Dr. Nikhil Gupta
Dr. Abhishek Shetty is a Lead Scientist working at the Advanced Technical center at Anton Paar USA. Dr. Shetty received his BS degree in Chemical Engineering from National Institute of Technology Karnataka and MS and PhD from University of Michigan, Ann Arbor, USA. Dr. Shetty has over 15 years of working experience in academia, CPG and Advanced instrumentation space. He is a named inventor on 2 US patents, has published several peer-reviewed scientific journal articles which have garnered hundreds of citations and also has presented at several scientific technical conferences. As the Lead Scientist at Anton Paar, his responsibilities are to develop next generation materials characterization methods relevant to Anton Paar’s rheology portfolio. Dr. Shetty's work with teams spans across the globe to develop new advanced applications using advanced rheometric tools. His work has been featured in prestigious journals such as Proceedings of the National Academy of Sciences (PNAS), Science Advances, Physical Review Letters (PRL), Journal of Rheology (JOR) etc.
Dr. Nikhil Gupta is a Professor in the Department of Mechanical and Aerospace Engineering at NYU Tandon School of Engineering, Brooklyn, NY. He directs the Composite Materials and Mechanics Laboratory. Dr. Gupta has seven issued patents and has published over 220 peer reviewed journal papers and book chapters on lightweight materials, materials characterization and manufacturing systems. His work has been featured in Discovery Channel, Scientific American, Reuters, ASME News, Materials Today and other media as videos and news articles.
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