Materials vocabulary 2 Flashcards
What is the symbol for strain?
ϵ
What is the symbol for natural length?
L
What is strain?
The change in length per uni length
What is the formula for strain?
e/L
Why does strain have no units?
It is a ratio
What is elasticity?
A property of materials which can regain their original shapes after being distorted (up to the elastic limit)
What is plastic?
as a property
A behavior found in materials when they are stretched past their elastic limit
If they are distorted they will not regain their original shape
What happens when a material yields?
It no longer behaves elastically
What is the yield point of a material?
The point at which it will no longer behave elastically
What is the symbol for the young modulus?
E
What is young modulus?
Stress is proportional to strain (as long as the limit of proportionality is not exceeded)
stress/strain = constant
What is the formula for young modulus?
E = stress/strain
What does UTS stand for?
Ultimate tensile strength
What is UTS?
The maximum stress an object can withstand before breaking
What is another name for UTS?
breaking stress
What is breaking stress?
The breaking force per unit area needed to break an object (stress needed to cause a failure)
What is the formula for breaking stress?
force/area
What is yield strength also known as?
yield stress
What is yield strength?
The amount of stress needed to deform a material permenantly
the stress needed for a material to go beyond its elastic limit
What is stiffness?
How difficult to stretch/bend an object is
e.g. the spring constant of a spring
