Optimizing the Post Sandvik Nanoflex material model using inverse optimization and the finite element method


Amstel, T. van and Groen, M. and Post, J. and Huetink, J. (2005) Optimizing the Post Sandvik Nanoflex material model using inverse optimization and the finite element method. In: eighth ESAFORM conference on Material Forming, April 2005, Cluj-Napoca, Romania (pp. pp. 167-170).

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Abstract:This article describes an inverse optimization method for the Sandvik Nanoflex steel in cold forming
processes. The optimization revolves around measured samples and calculations using the Finite Element
Method. Sandvik Nanoflex is part of the group of meta-stable stainless steels. These materials are characterized
by a good corrosion resistance, high strength, good formability and crack resistance. In addition, Sandvik
Nanoflex has a strain-induced transformation and, depending on austenising conditions and chemical composition,
a stress-assisted transformation can occur. The martensite phase of this material shows a substantial aging
response. The inverse optimization is a sub-category of the optimization techniques. The inverse optimization
method uses a top down approach, as the name implies. The starting point is a prototype state where the current
state is to converge on. In our experiment the test specimen is used as prototype and a calculation result as
current state. The calculation is then adapted so that the result converges towards the test example. An iterative
numerical optimization algorithm controls the adaptation. For the inverse optimization method two parameters
are defined: shape of the product and martensite profile. These parameters are extracted from both calculation
and test specimen, using Fourier analysis and integrals. An optimization parameter is then formulated from
the extracted parameters. The method uses this optimization parameter to increase the accuracy of ”The Post”
material model for Sandvik Nanoflex. [1] The article will describe a method to optimize material models, using
a combination practical experiments, Finite Element Method and parameter extraction.
Item Type:Conference or Workshop Item
Engineering Technology (CTW)
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