9) Consider a layered biocomposite (see Figure) in which a crystalline phase (dark) is alternating with amorphous phase (light). The volume fraction of the crystalline material is 0.3 and the Young's modulus of the crystalline and amorphous fractions are 50 GPa and 50 MPa respectively. Find effective Young's modulus in perpendicular direction and to the composite. Compare this result to effective Young's modulus in parallel direction to the composite.

A cylindrical specimen having a cross-section of radius, r, is subjected to a uniaxial tensile force, F, as shown in the accompanying figure. Establish a criterion for the selection of light and stiff materials for this bar (Hints: You need to develop an expression for the mass of material required in terms of tension, bar length, density, and stiffness of the material). M

6. Please indicate which structure belongs to metal, ceramic, polymer and glass ceramics: (a) (b) (c) (d) Crystalline grain Glas phane Mg H H H. MgO: Cubic Structure Cu Lattice (fcc)

A 1.02den silk fiber has reached its maximum tenacity value. How many grams (force) would it take to rupture such fiber when dry? Provide your answer with two (2) decimal positions and no unit Answer:

Derive an equation that shows the change in strain over time using the Maxwell Viscoelastic Model. It should look linear.