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Properties of Matter
Rigid body = body doesn't deform under influence of external force
Elasticity
wwo obey Hook's low
stretching of the bonds
Deformation
Elastic reversible
->
Plastic → break/fracture
/
break
atom bonds breaking
Type of stress
Tensile stress
→>>>
Young's Modulus (E)
:
•Stress deforming force / unit area
Fperpendicular
ON! SN
tensile stress
k
21 M
35N
(positive)
action
bending
Lk
10N¦ 3N
readion
A
internal force
compressive stress
B
41%
15 N
- Strain result of stress is length expansion.
Compressive stress
E
(negative)
E-AL
Young's Modulus (E)
linecr
σ = EE
Thex
ส
- yield point has before deform
Ultimate
strength
→
Elastic interatonic.
Plastic
←
fracture point
6
Plastic Slop - E=
E = 1 / [Pa]
Elastic
E
Shock absorber :
large elastic region
Protective component brittle material
→Shear Modulus (6)
:
Shearing
Shear stress
T= F
A
F
Shear strain
Y =
z
AX parallel displacement
L
perpendicular displacement
Sheer Modulus
6 = I
-Hydraulic stress
Bulk Modulus (B)
fluid
fluid pressure
pressure
ErP = BAV
A
Brittle
Material
Plastics doesn't fracture easily
Ductile
Ductile both elastic and plastic
Brittle break without plastic region.
Stress
VS
internal
Solid
Pressure
(
external
fluid
ō
Plastic
E
intermolecular
high compressive stress/hardness
"no plastic deformation"
low elasticity
E
f
absorb energy
before break