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APSC259 > Mechanical Properties of Materials > Flashcards

Mechanical Properties of Materials Flashcards

1
Q

Brittleness is

A

Tendency to fracture even at very small loads.

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2
Q

Creep is

A

deformation of a material at elevated temperatures

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3
Q

Ductility is

A

how much a material can deform without sustaining internal damage

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4
Q

Fatigue is

A

weakening of a material due to repeated (cyclic) loading

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5
Q

Hardness is

A

ability to resist permanent change in shape due to external load (applied)

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6
Q

Plasticity is

A

ability of a material to stay deformed after external; forces are removed (eg. paper clip)

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7
Q

Resilience is

A

ability to absorb energy and resist soft and impact loading

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8
Q

Stiffness is

A

ability to resist deformation as loading continues

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9
Q

Toughness is

A

ability of a material to resist fracture before failure.

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10
Q

What Stacking sequence does FCC have?

A

ABCABCABC

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11
Q

What Stacking sequence does HCP have?

A

ABABABAB

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12
Q

What are the 3 main crystal structures we studied this semester?

A

BCC, FCC, HCP

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13
Q

what are the zones on a conventional true stress-strain diagram from right to left?

A

elastic behavior, plastic(yielding, strain hardening,necking) behavior.

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14
Q

How do you measure elastic deformation?

A

Hookes law and Poisson’s ratio

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15
Q

What are the three tests used to measured material Hardness?

A

Rockwell, Brinell and Vickers.

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16
Q

what are the test parameters for hardness testing?

A

Load, Indenter, Dwell time.

17
Q

what does the letter E represent?

A

Elastic Modulus or Young’s modulus

18
Q

What does the letter G represent?

A

Shear Modulus

19
Q

what is poisson’s ratio?

A

poisons ratio v is defined as the ratio of the lateral and axial strains.

20
Q

What does this formula give for isotropic materials? E=2G(1+v)

A

it gives a relationship between shear and elastic moduli. if one is known then the other can be approximated.

21
Q

what is yield strength?

A

the bend between the elastic and plastic regions. (basically where the elastic limit is reached and plastic deformation begins).

22
Q

what is tensile strength?

A

it is the maximum stress at a point on the engineering stress strain curve. it is the maximum stress that can be sustained by a structure in tension. if this stress is applied and maintained, fracture will result.

23
Q

what is %EL?

A

% elongation

24
Q

what is %RA?

A

% Reduction in Area

25
Q

the hotter the material is the more brittle it is

A

False

APSC259 (7 decks)

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