FG Füge- und Schweißtechnik
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Thermal shock behavior of ceramics plays a decisive role in their broad industrial applications. For
enhanced understanding of damage and failure mechanism under thermal shock loading, in the present
work, a combination of experimental testing and numerical simulation methods has been used. The
thermal shock behavior of the alumina (99.7%) disk samples has been investigated by using a plasma
test stand: the bottom of the ceramic disks were locally heated in the center by plasma beam; during the
heat treatment the temperature distribution at the top of the sample was recorded with a thermographic
system. To characterize the thermal shock resistance, a thermomechanical simulation was subsequently
carried out. It calculates the temperature and stress distribution within the ceramic disks. The
calculated critical thermal tension stresses are reported, which led to the failure of the ceramic disks
under thermal shock loading. The effect of the sample thickness on the temperature and stress
distribution is presented. Compared with the experimental results the simulated results show excellent
agreement. As conclusion, it is possible to determine the thermal shock behavior of ceramic materials by
the combination of experimental testing and numerical simulation.