טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentAdi Batan
SubjectThe Influence of the Interfacial Layers on Hyperelastic
Composites
DepartmentDepartment of Aerospace Engineering
Supervisor Dr. Rudykh Stephan


Abstract

Composite materials play an important role in various engineering applications including aerospace industry. This is due to the attractive mechanical properties and strength-to-weight ratio of composite materials. Moreover, these properties can be tailored by designing the microstructural arrangements and composition of heterogeneous materials. Recent developments in material fabrications, in particular multimaterial 3D printing technologies, have already allowed the realization of material designs at different length scales.

In this study, we specifically focus on the mechanical properties of composite materials produced by the UV-assisted multimaterial 3D printing. In particular, we focus on the influence of the interphases between different phases on the mechanical performance of 3D printed composites. We find that while the interphase phenomenon barely influences effective mechanical properties of the composite, it significantly influences the material stability, such as critical strain and associated critical wavelength of elastic instability changes.

To elucidate the underlining phenomenon, we employ the finite element-based numerical analysis, and perform rigorous Bloch-Floquet instability analysis, while accounting for the interphases. The numerically obtained critical strains and wavelengths are compared with the experimental results on 3D printed laminates. We observe a good qualitative agreement between the experimental and numerical results.