。(a,b) e1 Free Surfaces Case(b) A specimen thinned down in the e,~direction,under tensile loading o.The dislocation is very far from all surfaces,except the upper and lower surfaces into which the dislocation runs.The dislocation and stress field are defined by: b=be 5=e =e(ie.,is the only nonzero component of stress) 3-D view applied stress 2 front view showing important diΠiensi0ns 11. Describe the role of stress(static and cyclic)in metallic corrosion phenomena. Discuss the use of fracture mechanics. 12. There is a long-standing interest in adding ceramic "particles"to metal matrices.Some examples of such commercial materials are WC-Co cermets, Al-SiC composites,and TD-nickel(thoria dispersed nickel).Describe in detail the various strengthening mechanisms that are possible in such systems(at both low and high temperature).Clearly delineate the ranges of particle size and volume fraction at which each mechanism operates.Also describe how the material behavior changes when such particles are added. 13. With the aid of suitable diagrams,deduce the types of monoclinic BravaisCase (b) A specimen thinned down in the ~direction, under tensile loading 3 eˆ σ . The dislocation is very far from all surfaces, except the upper and lower surfaces into which the dislocation runs. The dislocation and stress field are defined by: 1 2 ˆ ˆ b be ξ e = = 1 1 σ = σe eˆ ˆ (i.e., σ11 is the only nonzero component of stress) 11. Describe the role of stress (static and cyclic) in metallic corrosion phenomena. Discuss the use of fracture mechanics. 12. There is a long-standing interest in adding ceramic "particles" to metal matrices. Some examples of such commercial materials are WC-Co cermets, Al-SiC composites, and TD-nickel (thoria dispersed nickel). Describe in detail the various strengthening mechanisms that are possible in such systems (at both low and high temperature). Clearly delineate the ranges of particle size and volume fraction at which each mechanism operates. Also describe how the material behavior changes when such particles are added. 13. With the aid of suitable diagrams, deduce the types of monoclinic Bravais