Free Printable Chapter 2 Strain [MOM]

1.

What are two types of strains in engineering mechanics?

a)

Muscle strain

b)

Normal strain, $\epsilon$ and shear strain, $\gamma$

c)

Normal strain, $\gamma$ and shear strain, $\epsilon$

2.

Match correct strains with their physical change

[Choose ALL which applicable]

a)

Normal strain, $\epsilon$ : Change in SHAPE

b)

Normal strain, $\epsilon$ : Change in SIZE

c)

Shear strain, $\gamma$ : Change in SHAPE

d)

Shear strain, $\gamma$ : Change in SIZE

3.

Average normal strain is expressed as: $\epsilon_{ave}=\frac{\Delta s'-\Delta s}{\Delta s}$
What is this ratio in simpler words?

a)

$\frac{Final\ length}{Original\ length}$

b)

$\frac{Change\ of\ length}{Original\ length}$

c)

$\frac{Original\ length}{Final\ length}$

4.

And what is the unit of normal strain, $\epsilon$ ?

[Choose ALL which applicable]

a)

Dimensionless

b)

mm/mm

c)

in/in

d)

kg/kg

e)

m/m

5.

Average shear strain is expressed as:
$\gamma_{nt}=\frac{\pi}{2}-\lim\theta'$

Explain this in simpler terms

a)

New angle after deformation

b)

Original angle before deformation

c)

Change of an originally perpendicular angle

6.

And what is the unit of this shear strain, $\gamma$ ?

[Choose ALL which applicable]

a)

Dimensionless

b)

Degree

c)

Radian

d)

m/m

7.

Match CORRECT sign of normal strain, $\pm\ \epsilon$ , with its physical change in size

a)

$+\epsilon$ : Contraction; $-\epsilon$ : Elongation

b)

$-\epsilon$ : Contraction; $+\epsilon$ : Elongation

c)

No difference between $-\epsilon$ and $+\epsilon$

8.

Match CORRECT sign of shear strain, $\pm\ \gamma$ , with its physical change in shape

a)

$+\gamma$ : Angle getting smaller; $-\gamma$ : Angle getting bigger

b)

$+\gamma$ : Angle getting bigger; $-\gamma$ : Angle getting smaller

c)

No difference between $+\gamma$ and $-\gamma$

Chapter 2 Strain [MOM]

Total questions: 8

Worksheet time: 3mins

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