1. Failure mechanism defines possible failures that can be expected in metals. Follow the questions below by supporting tour answers.
a. Why are metals not defined by very ductile and brittle properties? Which properties are actually used then? (4)
b. Explain the manner at which the fracture of engineering metals occurs. (4)
c. Beside using the fractured specimens, how will one know what type of fracture was experienced on a metal piece? (2)
2. Fatigue failure is another mechanism of failure which affect the life span of metal.
a. Why is fatigue failure regarded as the working failure mechanism versus the static tensile failing? (2)
b. When metal fail by fatigue, what could have gone wrong during the application? (5)
c. What factors that are related to the metal accelerate fatigue failure? (2)
d. When a metal eventually fails by fatigue the failed surface show marks. Using time frame, explain the three zones of evident of fatigue failure. (6)