Structural Analysis and Materials Science Flashcards
6 cards from real ME or MEng Master of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Structural Analysis and Materials Science flashcards as text
Face-centered cubic (FCC) crystal structures are generally:
Answer: Ductile and have many slip systems
FCC metals (Al, Cu, Au, Ni) have 12 slip systems, enabling significant plastic deformation and high ductility.
The stress intensity factor K_I in fracture mechanics represents:
Answer: Stress amplification at a crack tip under Mode I (opening) loading
K_I = σ√(πa)·Y quantifies the stress field magnitude at a Mode I crack tip; fracture occurs when K_I reaches the material's fracture toughness K_IC.
Fatigue failure in metals typically initiates at:
Answer: Surface stress concentrations or defects
Fatigue cracks nucleate at surface irregularities, notches, or stress concentrators where cyclic stresses are locally amplified.
In a simply supported beam with a central point load P and span L, the maximum bending moment is:
Answer: PL/4
For a simply supported beam with central load P, M_max = PL/4 at midspan, derived from the bending moment diagram.
Which heat treatment process diffuses carbon into the surface of low-carbon steel to increase surface hardness?
Answer: Carburizing
Carburizing exposes low-carbon steel to a carbon-rich atmosphere at elevated temperature, enriching the surface layer with carbon for increased hardness.
The modulus of resilience for a material is defined as:
Answer: Stress at the proportional limit squared divided by twice the elastic modulus
Modulus of resilience U_r = σ_y²/(2E) is the energy per unit volume that a material can absorb elastically without permanent deformation.