Exam 1 Prep

Question 1

When learning stress concentration factor, when there is a change in geometry (from smaller to bigger diameter), would stress be higher or lower? Explain why that is.

Answer 1

As the diameter increases so does the area and when area increases, stress decreases

Question 2

Elestic vs. plastic

Answer 2

Elastic is when the material is able to recover after the stress is removed
Plastic is when the material is permanently deformed after stress

Question 3

Isotropic vs. anisotropic

Answer 3

Isotropic is crystallobic internal loading that allows material to be stronger
Anisotropic is directionally dependent of crystallobic

Question 4

Ductile versus brittle

Answer 4

Ductile is the materials ability to elongate/deform before breaking
Brittle is where the material does not deform before it breaks

Question 5

Name two important things that affect strength of materials

Answer 5

Geometry and internal loading

Question 6

What is the difference between the direct normal stress formula and direct shear stress formula? Explain and give illustration on how they are different

Answer 6

Normal stress. the force applied to the perpendicular area of the force applied.
Shear stress. The force is applied to the parallel area of the force applied.

Question 7

What is the difference between bearing stress and normal compressive stress? Explain and give illustration on how they are different.

Answer 7

Bearing stress, a force applied to two materials at the same time.

Normal compressive stress force applied to an even surface.