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CVEN 342 Final Review questions well answered(updated)
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CVEN 342 Final Review questions well answered(updated)
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CVEN 342 Final ReviewWhat are three different forms of failure? - correct answer ✔✔1) Creep (small, prolonged load)
2) Fracture (single, excessive load)
3) Fatigue (small, repeated load)
How does one measure toughness on a stress-strain curve? - correct answer ✔✔The toughness is equal
to the area underneath the curve.
What is a material called if it is sensitive to temperature? - correct answer ✔✔Thermoplastic
What is a material called if it is sensitive to strain rate as a function of time? - correct answer
✔✔Rheological
How is strain rate affected when temperature decreases? - correct answer ✔✔Strain rate increases.
How would you describe a material at low temperatures with fast loading times (elastic, viscous, or
viscoelastic)? - correct answer ✔✔Elastic
How would you describe a material at high temperatures with slow loading times (elastic, viscous, or
viscoelastic)? - correct answer ✔✔Viscous
How would you describe a material at intermediate temperatures with intermediate loading times
(elastic, viscous, or viscoelastic)? - correct answer ✔✔Viscoelastic
What are the primary mechanical models (3)? - correct answer ✔✔1) Spring (elastic)
2) Dashpot (viscous)
3) Slider (plastic)
, What are two simple tests to evaluate and model material behavior? - correct answer ✔✔1) Creep Test =
Response to Constant Load
2) Relaxation Test = Response to Constant Deformation
What are the types of non-Newtonian fluids (3)? - correct answer ✔✔1) Bingham
2) Shear Thinning
3) Shear Thickening
For reference, an example of a Newtonian fluid would be water (demonstrating a linear relationship).
What is the Maxwell Model? - correct answer ✔✔Dashpot and spring elements in series (same stress
acts on both elements). It is considered a viscoelastic model.
What is the Kelvin Model? - correct answer ✔✔Dashpot and spring elements in parallel (same strain acts
on both elements). It is considered a viscoelastic model (no relaxation test possible).
What is the Burgers Model? - correct answer ✔✔Combination of Maxwell and Kelvin model in series.
Define fracture. - correct answer ✔✔Fracture is the separation into multiple pieces.
- The crack typically initiates at a flaw point.
There are two types of fracture:
- The crack propagation is typically very fast with very little plastic deformation ahead of crack tip (brittle
= low fracture energy)
- The crack propagation occurs slowly with significant plastic deformation ahead of crack tip (stable =
ductile = high fracture energy)
Define fatigue. - correct answer ✔✔Fatigue is cyclic, repeated stresses NOT large enough to cause failure
in a single cycle.
- Failure tends to be sudden and without warning
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