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Materiali per l’Ingegneria M.Ferraris 1 Strain Stress 1 2 1 2 Secant modulus at 1 = 1 / 1 Tangent modulus at 2 = d/d Polymers: mechanical properties

08 polymers mech prop

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Materiali per l’IngegneriaM.Ferraris

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Strain

Stress

1

2

1 2

Secant modulus at 1 = 1/1

Tangent modulus at 2 = d/d

Polymers: mechanical properties

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0 200 400 600 800 1000 12000

10

20

30

40 HDPEC

ari

co [M

Pa

]

allungamento %

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elastomers

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Deformation of cross-linked bonds

Elongation of chains

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natural rubber

0 200 400 600 800 1000

0

10

20 gomma naturale

Ca

rico

[MP

a]

allungamento %

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0 10 20 30 40 50 60 70 80 90 1000

10

20

30

40

50

60

70 polistirene ABS policarbonato

Car

ico

[MP

a]

allungamento [%]

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Design of mechanical properties for polymers example:High impact polystirene (HIPS) containing elastomer particles

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Fatigue curves

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CREEP

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blowing

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