engleski

Inverse identification of elastoplastic material parameters for HARDOX 450

In order to accurately predict the response of engineering structures under prescribed workloads, it is essential to understand the behavior of the materials. For the most commonly used engineering materials, it is crucial to have an insight into their elastoplastic behavior since it can be described by different material models. The elastoplastic behavior of the material is determined by conducting mechanical tests with different loading histories. From the experimental investigation, the material response is accessed from indirect measurements (e.g. displacement fields and force). Displacement measurement methods are generally divided into contact and contactless methods. Digital Image Correlation (DIC) stands out as the most widely used contactless full- field measurement method. In this study, a Global DIC approach was employed [1]. The results obtained by this approach (i.e. measured displacements at nodes of the finite element (FE) mesh) form a straightforward connection with numerical simulations. Coupling FE-based DIC and numerical simulations in a single identification scheme, an inverse problem for determining elastoplastic material parameters is solved. Hence, for this study, the iterative Finite Element Model Updating (FEMU) [2] method was employed. The aim of this study was to determine linear elastic and nonlinear plastic material parameters of HARDOX 450. Previous research on the proposed material has been mainly focused on investigating the resistance to wear and corrosion [3]. However, the information on the material behavior

FEMU ; Hardox 450 ; plasticity

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