A Revolutionary New Approach to Mechanical Testing of Metals J E Campbell 1 M Burley 1 J Dean 1 amp T W Clyne 1 1 Plastometrex Salisbury House Station Road Cambridge CB1 2LA ID: 1042120
Download Presentation The PPT/PDF document "Indentation Plastometry:" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
1. Indentation Plastometry: A Revolutionary New Approach to Mechanical Testing of MetalsJ. E. Campbell1, M. Burley1, J. Dean1 & T. W. Clyne 11. Plastometrex, Salisbury House, Station Road, Cambridge, CB1 2LAIndentation Plastometry is now starting to become commercially available. It allows bulk mechanical properties, in the form of a tensile stress-strain curve, to be obtained from a single indentation experiment (via iterative FEM simulation of the process). Since indentation is an easy and rapid operation that can be carried out on small samples and real components, this constitutes an important advance.The procedure is simple and robust. It is also extremely fast - tensile stress-strain curves can be obtained in just a few minutes. It is based on representation of the plasticity characteristics in a constitutive law relating the true von-Mises stress to the true von-Mises strain. The most common is the Ludwik-Holloman equation, in which σy is the yield stress, k is the work hardening coefficient and n is the strain exponent: FEM simulation is then carried out repeatedly (using the Structural Mechanics Module of COMSOL Multiphysics), with the aim of finding the set of Ludwik-Holloman parameter values that give optimum agreement between experimental and predicted residual indent shapes.The rate at which the optimisation process is handled has been significantly enhanced by combining COMSOL-based finite element simulations with advanced machine learning algorithms. The entire software package, called SEMPIDTM, is built using the COMSOL Application BuilderTM, compiled using COMSOL CompilerTM, and then distributed with our custom-built Indentation Plastometers. 1: Indent Sample2: Measure Profile3: SEMPIDTM Analysis4: Stress-strain Curve3 minutesValidation example with Inconel 718For more examples and further information visit www.plastometrex.com