1 fracture mechanics of polymers b&r ch. 16.1-16.3, fried 4.4 testing methods of mechanical...
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Fracture Mechanics of PolymersB&R Ch. 16.1-16.3, Fried 4.4
Testing methods of mechanical properties
• Static
• Transient
• Impact
• Cyclical
2
Static tensile testing
FixedClamp
MovingClamp
Extensometer
3
Stress-strain tensile testing
stress-strain curves of typical polymeric materials.
properties of common polymers
Viscoelasticity
4
Craze and Shear Banding
5
F
F
F
Shearbanding
F
Poisson’s ratio
6
Cold drawing of semi-crystallinepolymers
7
Brittle vs. ductile failure
8
Factors affecting failure
-
-
-
-
-
-
• Compression
• Shear
9
Static tensile testing
Material subjected to uniform hydrostatic pressure
Material subjected to shear stress
Transient Test: Creep
• e1
• e2
• e3
10
Transient Test: Stress relaxation
11
eot
s
eo
e
Impact & fatigue testing
12
Charpy Test
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