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Microindentation Test Modelling in the Silicon Nitride Ceramics
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SYSNO ASEP 0435046 Druh ASEP O - Ostatní výsledky Zařazení RIV O - Ostatní Název Microindentation Test Modelling in the Silicon Nitride Ceramics Tvůrce(i) Kozák, Vladislav (UFM-A) RID, ORCID
Chlup, Zdeněk (UFM-A) RID, ORCIDRok vydání 2014 Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Silicon nitride ; Cohesive zone model ; FEM Vědní obor RIV JL - Únava materiálu a lomová mechanika Institucionální podpora UFM-A - RVO:68081723 Anotace Silicon nitride based ceramics have received considerable attention during the last decades due to their very good room and high-temperature properties. Such ceramics are acknowledged as first choice for application of modern hybrid bearing applications. The influence of crack bridging by the elongated grains present in the microstructure on the strength and toughness is well known phenomenon from the side of experimental observation. The modelling of this complex microstructure by classical continuum mechanic approach usually do not provide sufficient results. The prediction of the crack propagation through interface elements based on the fracture mechanics approach and cohesive zone model was investigated. The cohesive models seem to be especially attractive for practical applications in case of silicon nitride based ceramics. The behaviour of such materials was studied by two types of elements using cohesive models. The former is the element for the classical continuum and the latter is the connecting cohesive element. The new element type within the standard finite element package Abaqus has been developed and was written via the UEL procedure. The shape of the traction separation law for experimental materials was estimated from the macroscopic mechanical tests, J–R curve was predicted and stability of the bridging law was tested within this work. The shape of the bridging law was verified using the micro-indentation test, where the maximum crack length not exceeded 200e-6 m. The scope of the bridging effect was verified using the standard XFEM implemented in Abaqus and will be demonstrated within this contribution. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2015
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