ME Material Properties and Testing 3

Question 1

The fracture toughness parameter K_IC represents:

Accepted Answer

Critical stress intensity factor for Mode I fracture

Answer

Charpy impact energy

Answer

Yield strength under impact

Answer

Fatigue crack growth rate

Question 2

A material with high strength but low ductility is best described as:

Accepted Answer

Brittle

Answer

Tough

Answer

Resilient

Answer

Viscoelastic

Question 3

X-ray diffraction (XRD) is primarily used to determine a material's:

Accepted Answer

Crystal structure and lattice parameters

Answer

Grain size visually

Answer

Surface roughness

Answer

Hardness profile

Question 4

Creep in materials is most significant at temperatures above approximately what fraction of the melting point (in Kelvin)?

Accepted Answer

0.5 T_m

Answer

0.1 T_m

Answer

0.3 T_m

Answer

0.8 T_m

Question 5

Which type of fracture surface appears rough and fibrous, indicating significant plastic deformation?

Accepted Answer

Ductile fracture

Answer

Brittle fracture

Answer

Cleavage fracture

Answer

Intergranular fracture

Question 6

Magnetic particle inspection (MPI) can only be applied to:

Accepted Answer

Ferromagnetic materials

Answer

All metals

Answer

Non-ferrous alloys

Answer

Ceramic composites