Statische und dynamische Dauerfestigkeit von Aluminiumoxid-Sinterkörpern

Static and Dynamic Fatigue Strength of Sintered Alumina Ceramics The investigation have indicated that also high strength ceramic materials with practically no plasticity show similar “Wöhler-graphs” to plastically deformable materials such as steel, according to the measurements described here. Such “Wöhler” -like graphs apply to flexural, tensile and compressive strains as well as to the resistance against impact. After these results it can be concluded that a lower threshold exists for mechanical stresses below which the crack propagation comes to a stop. This leads to the conception of fatigue strength. The assumption of such a threshold value is not unopposed in theory however. It is therefore essential that more investigations be carried out over a longer period of time in order to answer this question finally.