Fasthet
Fasthet
Fasthet
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RA nov 2007<br />
σ y<br />
τ xy<br />
σ( φ)<br />
σ2<br />
σ x<br />
45°<br />
σ1<br />
τmax<br />
φ1<br />
Hovedspenninger<br />
σ( φ)<br />
τ( φ)<br />
φ<br />
σ x + σ y ⎛ σx − σ y ⎞<br />
σ 1,2 = ± ⎜ ⎟ + τ<br />
2 ⎝ 2 ⎠<br />
2τ<br />
tan 2 φ = , φ = φ + 45°<br />
1<br />
xy<br />
σx − σ y<br />
2 1<br />
τ =<br />
max<br />
σ − σ<br />
2<br />
1 2<br />
2<br />
fasthet 12<br />
2<br />
xy