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APSC 278 > 11. Fracture > Flashcards

11. Fracture Flashcards

1
Q

Does materials that brittle fracture undergo necking?

A

No

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2
Q

Doe materials that ductile fracture undergo necking?

A

yes

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3
Q

Doe brittle materials undergo plastic deformation?

A

not really, they fracture quite quicklu

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4
Q

to ductile materials undergo plastic deformation?

A

yes, extensively

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5
Q

What is the appearance of the fracture surface for ductile fracture?

A

dull and fibrous

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6
Q

What is the appearance of the fracture surface for brittle fracture?

A

shiny and crystalline

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7
Q

describe 3 morphological characteristics of ductile fracture

A
  1. Dimples (microscopic)
  2. Cup and cone
  3. Evidence of shear (failure along paths of maximum shear)
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8
Q

describe 3 morphological characteristics of brittle fracture

A
  1. Flat surface
  2. Evidence of cleavage
    of grains
  3. Chevron and fan-
    shaped patterns
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9
Q

Name 4 different defects that can occur during manufacturing

A
  1. Porosity
  2. Inclusions (ie contaminants)
  3. surface damage (ie dents, nicks, cracks)
  4. Dislocations
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10
Q

What does Kc stand for?

A

Fracture toughness

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11
Q

define fracture toughness

A

A measure of a material’s resistance to brittle fracture when a crack is present

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12
Q

what does kt stand for?

A

the stress concentration factor

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13
Q

What is Griffiths theory?

A

a crack will propagate when the release of elastic strain energy exceeds the energy required to form new crack surfaces

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14
Q

How is energy consumed and generated by the propagation? of a crack

A

Energy is CONSUMED to create new fracture surfaces (ie extend the crack).

the crack RELEASES elastic strain energy

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15
Q

In plane strain there ___ (is no/is) strain perpendicular to the front and back faces

A

is no

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16
Q

fracture toughness decreases with ____(decreasing/increasing) yield strength

A

Decreasing

17
Q

fracture toughness decreases with ____(decreasing/increasing) ductility

A

decreasing ductility

18
Q

are fracture toughness and toughness the same thing?

A

no

19
Q

the same stress field ahead of the crack tip is observed if the same ____ ____ ____ __ exists

A

stress intensity factor K

20
Q

What does KI stand for?

A

(Plane strain) stress intensity factor

21
Q

What does KIC stand for?

A

Plane strain fracture toughness

22
Q

Given the values of KI and KIC how do you determine if a crack propagates?

A

If KI ≥ KIC the crack will propagate

APSC 278 (20 decks)

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