Material Properties and Testing Flashcards
6 cards from real ME practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Material Properties and Testing flashcards as text
The fracture toughness parameter K_IC represents:
Answer: Critical stress intensity factor for Mode I fracture
K_IC is the plane-strain fracture toughness, representing the critical stress intensity factor at which a Mode I (opening) crack will propagate catastrophically.
A material with high strength but low ductility is best described as:
Answer: Brittle
Brittle materials have high strength but fracture with little plastic deformation, resulting in low toughness and ductility.
X-ray diffraction (XRD) is primarily used to determine a material's:
Answer: Crystal structure and lattice parameters
XRD identifies crystalline phases, crystal structure, and lattice parameters by analyzing the diffraction pattern produced when X-rays interact with the atomic lattice.
Creep in materials is most significant at temperatures above approximately what fraction of the melting point (in Kelvin)?
Answer: 0.5 T_m
Creep becomes significant above approximately 0.3-0.5 T_m (homologous temperature), where thermally activated diffusion mechanisms drive time-dependent deformation.
Which type of fracture surface appears rough and fibrous, indicating significant plastic deformation?
Answer: Ductile fracture
Ductile fracture surfaces are rough and fibrous due to microvoid coalescence and significant plastic deformation before failure.
Magnetic particle inspection (MPI) can only be applied to:
Answer: Ferromagnetic materials
MPI requires ferromagnetic materials such as iron, steel, or nickel, because the technique relies on magnetic flux leakage at surface or near-surface defects.