Rasmus ÿstergaard forside 100%.indd - Solid Mechanics
Rasmus ÿstergaard forside 100%.indd - Solid Mechanics
Rasmus ÿstergaard forside 100%.indd - Solid Mechanics
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∗ a/(unE ′ <br />
/ˆσ)<br />
<br />
<br />
<br />
¯σ/ˆσ =1.<br />
∗ a/(unE ′ /ˆσ) → 0 <br />
¯σ/ˆσ → 1<br />
<br />
<br />
ˆσ.<br />
∗ <br />
a/(unE ′ <br />
/ˆσ) > 2<br />
<br />
<br />
<br />
<br />
= 0.004m ˆσ = 1MPa<br />
u ∗ n<br />
′ <br />
E = 40GP a.<br />
<br />
<br />
a>320m.<br />
<br />
<br />
<br />
E = 120MPa.<br />
ˆσ = σuts =3MPa u∗ n = GIc/ˆσ = 300J/m2 <br />
<br />
/3MPa =0.0001m<br />
a 1cm.<br />
© <br />
<br />
<br />
<br />
P.<br />
<br />
<br />
<br />
a0/H =7.5. ˆσn/E =1.92·10−5 <br />
<br />
.<br />
∗ un /H =0.122.
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