Cracks 2 Flashcards

1
Q

What are the properties of cracks?

A

-No volume
-Move without diffusion
-Can move fast

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2
Q

What are some microstructural defects?

A

-Inclusions
-Precipitates
-Substitutional atoms
-Interstitial atoms
-Vacancies
-Dislocations

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3
Q

What assumptions are applied in LEFM?

A

It’s a homogeneous, isentropic, elastic continuum

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4
Q

What does LEFM stand for?

A

Linear Elastic Fracture Mechanics

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5
Q

What is K1/ what does it represent?

A

It is the mode 1 stress intensity factor
It represents the severity of the stress singularity

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6
Q

What are the three modes of fracture?

A

Mode I: Opening
Mode II: Shear
Mode III: Antiplane Shear

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7
Q

Give examples for each of the fracture modes

A

Mode I: the normal response of equi-axed material
Mode II: often observed in materials with definite planes weakness
Mode III: Shafts loaded in torsion

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8
Q

How do different elastic cracks compare?

A

The pattern of stress and displacement is identical near the tip
The only difference between cracks is the value of K

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9
Q

What is the stress intensity factor equation?

A

K = Ysigmasqrt(pi*a)

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10
Q

What is Y?

A

A dimensionless calibration function which deals with geometrical details

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