IFCPAR AR (ENGLISH) for CD - CEFIPRA

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CEFIPRA Centre Franco-Indien pour la Promotion de la Recherche Avancée Duration: Four years (February, 2007 to January, 2011) Objectives The aim of the proposal was to undertake the formulation, implementation and experimental validation of a comprehensive numerical methodology to simulate crack initiation and propagation in solid, amorphous glassy polymers over a wide range of loading rates and thermal conditions. As a final deliverable, a Finite Element code was to be developed that can model i) The development of shear banding ii) The Initiation, widening and breakdown of crazes iii) The Propagation of cracks as a result of the competition between these two processes in glassy amorphous polymeric materials The code was to be supplemented by extensive controlled experiments on commercial glassy amorphous polymers like poly methyl metacrylate (PMMA) and polycarbonate (PC) to ascertain the parameters involved in the modeling. This endeavour was expected to provide the practicing engineer a comprehensive predictive capability over fracture parameters like the critical fracture toughness Kc over a wide range of loading rates (ranging from static/slow to dynamic/impact-like loading) and temperatures (upto the glass transition temperature) and enable a fracture-based design procedure for these materials Accomplishments i) Basic constitutive model for glassy amorphous polymers developed ii) Cohesive zone model developed for crazing iii) Computational model developed are as follows: a) Study on the importance of thermo-elastic cooling in crazing at high strain rates b) Determination of appropriate sample preparation and simulation techniques for MD simulations of mechanical behavior of glassy polymers c) Applicability of rubber elastic theories to describe large strain plastic deformation in glassy polymers d) Study of the very early stages of cavitation in polymers e) MD analysis of cavitation in glassy polymers: Probing and characterizing the early stages of cavitation in glassy polymers in molecular dynamics simulations f) A multiscale study of age induced brittleness and rejuvenation in polymers g) Simulation of fracture in polymers under high strain rates h) Experimental and numerical analysis of glassy polymer fracture at high loading rate; Three dimensional effects on the crack tip fields in polycarbonate Research papers published: Five Project 3608-1 DEVELOPMENT OF AN EXPERIMENTALLY VALIDATED SIMULATION SCHEME FOR FRACTURE OF GLASSY, AMORPHOUS POLYMERS Research Activities 2010-11 Material Sciences Dr. Sumit Basu Department of Mechanical Engineering Indian Institute of Technology Kanpur Prof. Rafael Estevez Laboratoire GEMPPM INSA de Lyon Villeurbanne 23
24 Material Sciences Dr. Shrikant V Joshi International Advanced Research Centre for Powder Metallurgy and New Materials Hyderabad Dr. Christophe. I. Martin Laboratoire SIMAP-GPM2, INPG CNRS Damaine Universitaire St. Martin d' Heres Project 3608-3 INVESTIGATION OF COMPACTION AND SINTERING OF NANO POWDERS USING DISCRETE ELEMENT METHOD (DEM) SIMULATIONS IFCPAR Indo-French Centre for the Promotion of Advanced Research Duration: Three years and six months(April, 2007 to September, 2010) Objectives ¡Code development for DEM simulations of uniaxial and isostatic compaction of nano sized ceramic as well as metallic powders and composites ¡Assessment of the role of surface energy of nano particles in forming agglomerates during compaction ¡Assessment, through dynamic dislocation simulations, of contact laws for submicron particles ¡Using the results of DEM simulations on compaction as initial conditions, code development for DEM simulations of sintering of nano powders ¡Experimental validation of DEM models developed for compaction and sintering of nano powders Accomplishments i) Adhesion and non contact Van der Waals interaction force implementation ii) Crushing test simulations on agglomerates and aggregates of various particle size iii) Close die compaction simulations of powders and particle size effect demonstration iv) Extension of close die compaction simulations to unloading process stages and experimental verification v) Simulated the effect of binder, bond strength and particle size during tensile and compression tests, partial experimental validation of the simulation results Research papers published: Three Papers presented in conferences: 5
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