1 Fracture Mechanics of Polymers B&R Ch. 16.1-16.3, Fried 4.4 Testing methods of mechanical...
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Transcript of 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
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Static tensile testing
FixedClamp
MovingClamp
Extensometer
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Stress-strain tensile testing
stress-strain curves of typical polymeric materials.
properties of common polymers
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Viscoelasticity
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Craze and Shear Banding
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F
F
F
Shearbanding
F
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Poisson’s ratio
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Cold drawing of semi-crystallinepolymers
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Brittle vs. ductile failure
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Factors affecting failure
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• Compression
• Shear
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Static tensile testing
Material subjected to uniform hydrostatic pressure
Material subjected to shear stress
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Transient Test: Creep
• e1
• e2
• e3
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Transient Test: Stress relaxation
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eot
s
eo
e
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Impact & fatigue testing
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Charpy Test