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A new test method for the determination of the static burst strength of ceramic hip joint heads is described. The common test method is the test with an axial direction of the compressive force. In the following publication a finite element analysis of the stress distribution in ceramic heads under angular loading is shown. The results concerning the location of the highest hoop and tensile stresses are compared with the results of experimental tests for the determination of the static burst load of ceramic heads under a load direction of 25°.

Digester gas produced at sewage plants is usually used in combined heat and power plants (CHPP) or boilers and only a minor portion is wasted in gas torches. In combination with an optimised power consumption of the sewage plant and the implementation of a co-digestion even an energy self-sufficiency of sewage plants is possible (Kolisch et al., 2009). Selling of the digester gas to external consumers or an upgrade to natural gas quality with subsequent injection into the natural gas grid might be alternatives to the conventional use. The mentioned options were investigated in consideration of the current energy consumption of sewage plants. The results show that the internal power production by a CHPP is currently most economic. However, the implementation of a local energy network in order to to deliver an energy surplus to external users can be feasible.

KurzfassungEs wurde nach Möglichkeiten gesucht, durch konstruktive Maßnahmen das Range of Motion keramischer Gleitpaarungen zu erhöhen und die Wahrscheinlichkeit für das Auftreten von Impingement- und damit verbundenen Subluxationsvorgängen weiter zu verringern. Als konstruktive Lösungen wurden der Einsatz keramischer Gleitpaarungen größer 28 mm Durchmesser und eine Abflachung der Keramikinlays in Betracht gezogen. Die Ermittlung des Range of Motion bei Flexion und Extension erfolgte mittels einer CAD-Simulation.

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