The Paper Shows Results of the Finite Element Modelling of Contact of a Rigid Spherical Body (indenter) with a Body from Elastic-Plastic Material. both the Proces of Loading and Unloading are Modelled. in Addition to Stresses, Also Energies are Investigated, Including their Distribution in the Plastically Deformed Core and the Elastically Deformed Outer Region. Attention is Devoted to Residual Stresses and Energies as well. Influence of Various Factors is Investigated, such as Various Values of Strain-Hardening Parameters (e.g. in Johnson-Cook Model), Relative Depth of Penetration (h/R), Coefficient of Friction.
The concentrated elastic-plastic contact was studied on a thin disc loaded by axial pressure in the central part. Components of energies and stresses were determined via a simple model and discussed.
Tento článek se zabývá stručným popisem modelování indentace do tvrdých a křehkých materiálů, například skla, vrstveného skla nebo různých druhů keramiky pomocí metody konečných prvků. Vytvořený model je velmi užitečný jako podpora indentační zkoušky proto, že touto cestou získáme další materiálové charakteristiky, které je obtížné nebo dokonce nemožné získat experimentálně, ale také z důvodu odhalení zdrojů nepřesností měření. Dalším přínosem je možnost zkoumat odezvu nějaké neznámé kombinace vrstvených materiálů a posoudit tak vhodnost použití pro daný účel, aniž by bylo nutné vzorek předem vyrobit.
This paper shows the results of finite element modelling of contact problems between perfectly rigid body with rough surface and an indenter from elastic-plastic material. In the first phase, spherical indenter from elastic – plastic material is considered, which is pressed into a body with a rough surface. Results show the influence of the amplitude and distances of various undulations at the rough surface to response surface.
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