Statics Test 2 Theory

Question 1

what are the 5 classifications of materials?

Answer 1

metals, polymers, ceramics and glass, composites, and naturals

Question 2

what are the 8 mechanical properties?

Answer 2

strength, elasticity, stiffness, ductility, brittleness, hardness, fatigue strength, and creep

Question 3

define strength

Answer 3

the largest stress a material can withstand without failure

Question 4

define elasticity

Answer 4

the ability of a material to assume its original pre-load shape after the load that caused the deformation is removed

Question 5

define stiffness

Answer 5

a measure of a materials ability to resist deformation in the elastic region

Question 6

define ductility

Answer 6

a measure of a materials ability to deform permanently or plastically before breaking or rupturing.
(very ductile materials can elongate up to 30% of their original length before breaking)

Question 7

define brittleness

Answer 7

describes a material which will have little or no permanent deformation before breaking

Question 8

define hardness

Answer 8

a materials ability to resist penetration

Question 9

what is fatigue strength?

Answer 9

an indication of how a material performs under repetitive cycles of loading

Question 10

define creep

Answer 10

a materials slow continuous deformation over time

Question 11

define resilience

Answer 11

a materials capacity to absorb energy without any plastic or permanent deformation

Question 12

define toughness

Answer 12

a materials capacity to absorb energy without breaking or fracturing