Formler Flashcards

1
Q

(normal)spenning

A

σ = F/A N/mm2, MPa

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2
Q

(lengde)tøyning

A

ε = dL/L (= u/L)

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3
Q

elastisitetsmodul / E-modul

A

E = σ/ε (Hookes lov for lineær elastisitet) GPa

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4
Q

skjærspenning

A

τ = F(90)/A

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5
Q

skjærtøyning

A

γ = w/L = tanθ

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6
Q

skjærmodul

A

G = τ/γ (Hookes lov i skjær) GPa

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7
Q

tverrkontraksjonstallet

A

ν = ‐ εt/ε = - tverrtøyning/lengdetøyning

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8
Q

(lineær) elastisk energi

A

Uel = (σε)/2 = (σ**2)/2E Nm, J

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9
Q

sann spenning

A

σ(sann) = σ(n)*(1+ε(n)) N/mm2, MPa

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10
Q

sann tøyning

A

ε(sann) = ln(1+εn)

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11
Q

bruddseighet

A

Kc = (G(c)*E)^(1/2) N/m^(3/2)

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12
Q

seighet

A

G(c) J/mm2, N/mm

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13
Q

spenningsintensitetsfaktor

A

K = σ(api)^(1/2) N/m^(3/2)

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14
Q

varmekapasitet

A

C = ΔQ/ΔT J/K

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15
Q

spesifikk varmekapasitet

A

c = ΔQ/(m*ΔT) J/(kgK)

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16
Q

termisk utvidelseskoeffisient

A

α = ε/ΔT 1/K