S ohledem na aktuální nařízení vlády v nouzovém stavu je veškerá KONTAKTNÍ výuka na FA ČVUT přerušena až do 1. 11. 2020.


Study of micromechanical behavior of cement paste by integration of experimental nanoindentation and numerical analysis

Dr. Ing. Petr Jůn

In the present study, we use the finite element method to examine the ability of various constitutive relations to reproduce the response of a hydrated phase of hardened cement paste measured in a cyclic nanoindentation experiment. It is found that the linear viscoelastic model, which fits very well a single loading-dwell-unloading cycle, does not properly describe the subsequent cycles. Qualitatively the best results are obtained with a combined viscoelastic and plastic constitutive law. A finite element model is also employed to analyze the effect of material inhomogeneity in the vicinity of the indent. The results of the numerical study provide a valuable feedback to experiments by helping to select appropriate indentation depths and loading histories. The study also extends the knowledge about the micromechanical behavior of cement paste.

Za obsah této stránky zodpovídá: prof. Dr. Henri Hubertus Achten