Thesis defense of Arruck TRAGANGOON

of center of materials, MINES ParisTech

Arruck TRAGANGOON  had defend his thesis

Study of multi-material assemblies by mechanical joint, by threaded insert and by adhesive joint of composite structure

on June, the 16th

To reduce the weight of vehicles, the multi-material structures with composite materials have been used in the automotive industries. However, the joints are considered as the weakest parts of the structure. In this work, the joining methods used for metal/ composite automotive seat, including a mechanical joint, a threaded insert and an adhesive joint, have been studied. The components of the seat under consideration were made of woven composite (glass/PA6) and short fiber composite (glass/PA66). The mechanical behaviors of the studied materials, including adhesives, have been modeled based on the experimental results. For parts containing an open-hole and for mechanical joints, the characteristic volume has been used to determine the failure of woven composite. In the case of adhesive joints, the characteristic length has been used to determine the failure. Single lap shear tests and the torsion tests on a bonded structure were conducted and simulated. For the failure of short fiber composite structure, the material strength has been evaluated as a function of local fiber orientation. The tensile tests on the short fiber composite connecting rod were conducted and simulated. Finally, the proposed constitutive laws and failure prediction methods were applied for the simulation of the automotive seat under crash test condition.