T - Mechanika
T - Mechanika
T - Mechanika
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
σ a<br />
σ C<br />
k = 2<br />
α<br />
⎡ ⎛<br />
⎢ ⎜σ<br />
σ A = σC<br />
1−<br />
⎢ ⎜<br />
⎣ ⎝ σF<br />
m<br />
⎞<br />
⎟<br />
⎟<br />
⎠<br />
k<br />
⎤<br />
⎥<br />
⎥<br />
⎦<br />
Re<br />
Pevnost a životnost - Hru I 8<br />
Haighův diagram<br />
k = 1<br />
σ<br />
F<br />
σ F<br />
σ σ C C<br />
= =<br />
tg α ψ<br />
σ m<br />
-σ m<br />
σ a<br />
R e<br />
σ a,ekv<br />
⎡ σ<br />
σ A = σC<br />
⎢1−<br />
⎢⎣<br />
σ<br />
R 0<br />
e Re Rm odhad fiktivního napětí:<br />
σ<br />
tah: F<br />
ohyb: σ F<br />
krut: τ<br />
F<br />
= Rm<br />
( 1,<br />
5 ÷ 1,<br />
7)<br />
= Rm<br />
= ( 0,<br />
7 ÷ 0,<br />
8)Rm<br />
m<br />
F<br />
⎤<br />
⎥<br />
⎥⎦<br />
+σ m
Change language