Static and Dynamic Behavior of a 3D-Periodic Structure
This paper lies within the context of assessment of damage of an air-to-air compact exchanger subjected to cyclic pressure, temperature and vibrations. The objective is to provide a predictive lifetime model both for accelerated testing and in-service applications. The model should describe the macroscopic behavior and the ageing of the interfaces between the core of the exchanger and all elements attached to the core. These interfaces constitute the critical sites where damage might occur. The modeling reported here is limited to the description of the core behavior in order to evaluate later the efforts that the core generates on the interfaces. The stiffness of the core is calculated in all three directions via an analytical method. In addition, a FE calculation is performed using the FE code Samcef. Also, static tensile tests are carried out on specimens in all three directions.