The objective of this research is first to completely characterized the local mechanical behavior of the through-tenon joint as solely its rotational stiffness has been thoroughly studied. Shear tests and traction and compression tests will be carried out. A 3D numerical model will be developed from an existing continuum damage mechanics model and analysis results will be compared with experimental testing. The purpose of a complete 3D numerical model is to avoid experimental testing in further investigations as experimental testing is time consuming and expensive. It will also allow performing combined loading.
Secondly, since increasingly complex structures with a high number of these joints are designed and a detailed modeling of each of these joints would be time-consuming and expensive, a simplified model will be developed. A spring model of the through-tenon joint representing its mechanical behavior using a rigid beam with 6 springs at both extremities (allowing 6 degrees of freedom at each node) will be proposed using the finite element analysis software Abaqus. Springs stiffnesses values will be retrieved from the local study.
The final goal of this thesis is to establish a link between the local behavior of the joints and the global response of a structure while keeping its main geometric characteristics. The simplified elements will thus be implemented in the double-layered plate shell and the global behavior of the structure will be assessed.