Theory questions of the exam collection

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LIGHTWEIGHT DESIGN – BERNASCONI - AA 2022/23 EXAMPLES OF QUESTIONS OF THE ORAL EXAM 2 possibilities for the oral exam: if during the semester you have done the homework, you can present your own project at the oral and all the questions asked will concern your project (theory about the project). If during the semester you did not delivered the homework, the oral exam will be about the theory of the whole program. During the oral exam, if needed, can use the slides of the course. 1) How the choice of using a sandwich panel would affect the stiffness of the structure? 2) Definition of transversely isotropic material: E2, E3, G12, … 3) What are the main differences between the Tsai-Hill and the Tsai-Wu failure criteria? How does the sign changes? Draw the envelopes of the 2 criteria 4) How can we obtain the expression of the flexural modulus using the CLT? 5) How is the shear stress distribution in a thin plate in tension compared to the CLT? (interlaminar stresses) 6) Explain the shear stress distribution in a single-lap joint (adhesive joining) 7) Describe the [A B B D] matrix: how does the different coupling effects can be avoided? 8) How does the stacking sequence of one composite affects the resistance of the part in case of drilled holes for bolts? 9) How to obtain a quasi-isotropic layup for a laminate? 10) How does it work the buckling analysis in Abaqus? 11) Write the Tsai-Hill formula for failure 12) Write the Tsai-Wu formula for failure 13) Write the formula of the deflection for a slender beam: bending contribution and shear contribution