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9.13: Questions

Last updated

Nov 26, 2020
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- 9.12: Summary
- 10: Casting

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Quick questions

You should be able to answer these questions without too much difficulty after studying this TLP. If not, then you should go through it again!

The Lennard-Jones potential best describes which of the following:


Answer: C

Which of the following situations is required for fast fracture to occur?


Answer: B

In the wedging setup, which of the following will *not* influence the critical crack length?


Answer: A

Which one of Irwin's modes of fracture best describes a car tyre skidding on a dry road?


Answer: B

What is the critical stress intensity factor equal to when no residual stresses are present?


Answer: A

What best describes the situation in wedging?


Answer: A

a	The crack tip is sufficiently sharp
b	dG/dc is greater than dR/dc
c	The applied stress is near the ultimate tensile strength of the material
d	The strain energy release rate G is equal to the fracture energy R.

a	The position of the wedge
b	The stiffness of the material
c	The thickness of the peeling layer
d	The surface energy of the material

a	Fracture toughness
b	Crack resistance
c	Ultimate tensile strength
d	Fracture energy

a	The energy required to break a typical metal
b	How flaws affect the energy of a lattice
c	The energy associated with stretching an atom

a	As the wedge position is varied, it is always energetically favourable for the crack to return to an equilibrium length
b	The fracture energy dominates at small crack lengths
c	If the crack becomes very long in comparison to the geometry of the setup, unstable fast fracture may occur

a	Mode I
b	Mode II
c	Mode III

Quick questions

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