Jansen van Rensburg, Gerhardus J.Kok, SchalkWilke, Daniel Nicolas2018-03-122018-02Van Rensburg, G.J.J., Kok, S. & Wilke, D.N. Simultaneous estimation of boundary conditions and material model parameters. Structural and Multidisciplinary Optimization (2018). https://doi.org/10.1007/s00158-018-1924-4. NYP.1615-147X (print)1615-1488 (online)10.1007/s00158-018-1924-4http://hdl.handle.net/2263/64217Room temperature experimental compression test data is available for different hardmetals. This data indicates the presence of some spatial inhomogeneity due to a compression instability, eccentric loading or time varying equivalent bending moment. To account for this, an inverse analysis is employed that determines not only the constitutive material model parameter values but also the displacement boundary conditions that best replicate the experimental data. The unknown boundary displacement history is approached using a systematically refined piecewise linear approximation, determined alongside material parameter values. The systematic simultaneous estimation of material parameter values and boundary approximations is also investigated using a virtual problem for which the exact solution is known. This investigation confirms that known material parameter values and boundary conditions can be recovered without using any prior knowledge of the exact displacement boundary conditions.en© Springer-Verlag GmbH Germany, part of Springer Nature 2018. The original publication is available at : http://link.springer.comjournal/158.Inverse problemFinite element analysis (FEA)Parameter identificationMaterial model calibrationHardmetal compressionPiecewise linear techniquesIdentification (control systems)Compression testingBoundary conditionsParameter estimationSpatial in-homogeneitySimultaneous estimationPiecewise linear approximationsMaterial modelingHard metalsDisplacement boundary conditionsConstitutive materialsBoundary approximationsEngineering, built environment and information technology articles SDG-09SDG-09: Industry, innovation and infrastructureEngineering, built environment and information technology articles SDG-12SDG-12: Responsible consumption and productionPostprint Article