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
Which mechanical property describes a material's ability to absorb energy and plastically deform before fracturing?
Answer: Toughness
Toughness is the ability of a material to absorb energy and deform plastically before fracturing, represented by the area under the stress-strain curve.
In a standard tensile test, the engineering stress is calculated by dividing the applied force by:
Answer: The original cross-sectional area
Engineering stress uses the original (undeformed) cross-sectional area, while true stress uses the instantaneous cross-sectional area.
The Charpy impact test measures which material property?
Answer: Impact toughness
The Charpy impact test measures impact toughness by striking a notched specimen with a pendulum hammer and measuring the energy absorbed.
Which hardness testing method uses a Vickers diamond pyramid indenter and is most suitable for thin materials?
Answer: Vickers
The Vickers hardness test uses a square-based pyramid diamond indenter and is well-suited for thin materials because the indentation is very small.
The proportional limit on a stress-strain curve is the point beyond which:
Answer: Stress and strain are no longer proportional
Beyond the proportional limit, Hooke's Law no longer applies and the stress-strain relationship is no longer linear.
Which of the following tests is used to measure the fatigue life of a material under cyclic loading?
Answer: S-N (Wohler) test
The S-N test (stress versus number of cycles) generates the Wohler curve, which characterizes a material's fatigue behavior under cyclic loading.