Modulus And Stiffness

Question 1

Elastic modulus is

Answer 1

The resistance of a MATERIAL to elastic deformation

Question 2

Modulus is related to

Answer 2

Bonding strength

Question 3

Modulus also determines

Answer 3

Natural frequency

Low modulus= low frequency

Question 4

Stiffness is

Depends on

Answer 4

The resistance of a STRUCTURE to elastic deformation

Depends on elastic modulus and shape

Question 5

Engineering stress uses what area

Answer 5

Original area

Question 6

Which is larger? True stress or engineering stress

Answer 6

True stress

Question 7

True strain uses what gauge length

Answer 7

Instantaneous

Question 8

Up to the strain where…. begins, specimens deform with ….

Answer 8

Necking

Constant volume

Question 9

3 types of elastic modulus and the loading relating to them

Answer 9

Young’s modulus(E)-tensile/compressive

Shear modulus (G)- shear force
Bulk modulus(K)- hydrostatic pressure

Question 10

Poisons ratio is usually

Answer 10

0.3

Question 11

Are stress and strain material properties

Answer 11

No

Question 12

Cohesive energy

Answer 12

Cohesive energy= a measure of the strength of bonds

Question 13

Isotropic=

Answer 13

Properties don’t depend on the direction in which they are measured across a material

Question 14

Anisotropic=

Answer 14

Properties are dependent on the direction they are being measured

Question 15

For the same cross-sectional area the best bending shape is

Answer 15

I beam

Question 16

I=(b^4)/12 is second moment of area for

Answer 16

Cube

Question 17

I=(2b^3 xt)/3 is second moment of area for

Answer 17

Cube with cube cut out

Question 18

I= (bh^3)/12 is second moment of area for

Answer 18

Cuboid

Question 19

I=(1/6)(h^3)t(1+(3b/h)) is second moment of area for

Answer 19

I beam

Question 20

I=(pi r^4)/4 is second moment of area for

Answer 20

Circle

Question 21

I=pi r^3 t is second moment of area for

Answer 21

Circle with circle cut out

Question 22

A stiff beam with have … I and E

Answer 22

High