SKRIPTA RIJEÅ ENIH ZADATAKA IZ OTPORNOSTI MATERIJALA
SKRIPTA RIJEÅ ENIH ZADATAKA IZ OTPORNOSTI MATERIJALA
SKRIPTA RIJEÅ ENIH ZADATAKA IZ OTPORNOSTI MATERIJALA
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50<br />
40. Zadatak<br />
Sastavljena osovina kružnog popre�nog presjeka optere�ena je momentom torzije Mt . Odrediti<br />
najve�a naprezanja u pojedinim dijelovima osovine i potencijalnu energiju deformacije.<br />
mm<br />
d<br />
mm<br />
D<br />
mm<br />
D<br />
mm<br />
N<br />
E<br />
kNm<br />
M t<br />
64<br />
120<br />
80<br />
3<br />
,<br />
0<br />
10<br />
2<br />
15<br />
2<br />
1<br />
5<br />
=<br />
=<br />
=<br />
=<br />
⋅<br />
=<br />
=<br />
ν<br />
( ) ( )<br />
4<br />
6<br />
4<br />
4<br />
2<br />
2<br />
4<br />
6<br />
4<br />
4<br />
4<br />
4<br />
1<br />
1<br />
10<br />
3<br />
,<br />
20<br />
32<br />
120<br />
32<br />
10<br />
4<br />
,<br />
2<br />
32<br />
64<br />
80<br />
32<br />
mm<br />
D<br />
I<br />
mm<br />
d<br />
D<br />
I<br />
p<br />
p<br />
⋅<br />
=<br />
=<br />
=<br />
⋅<br />
=<br />
−<br />
=<br />
−<br />
=<br />
π<br />
π<br />
π<br />
π<br />
Uvjet ravnoteže<br />
( )<br />
1<br />
0 K<br />
t<br />
B<br />
A<br />
z<br />
M<br />
M<br />
M<br />
M =<br />
+<br />
→<br />
=<br />
∑<br />
Uvjet deformacije<br />
( )<br />
kNm<br />
M<br />
M<br />
M<br />
kNm<br />
I<br />
I<br />
I<br />
M<br />
M<br />
GI<br />
M<br />
GI<br />
M<br />
GI<br />
M<br />
B<br />
t<br />
A<br />
p<br />
p<br />
p<br />
t<br />
B<br />
p<br />
B<br />
p<br />
B<br />
p<br />
t<br />
A<br />
458<br />
,<br />
9<br />
54<br />
,<br />
5<br />
0<br />
,<br />
2<br />
4<br />
,<br />
1<br />
1<br />
8<br />
,<br />
0<br />
2<br />
0<br />
0<br />
,<br />
2<br />
4<br />
,<br />
1<br />
8<br />
,<br />
0<br />
0<br />
1<br />
2<br />
1<br />
1<br />
2<br />
1<br />
=<br />
−<br />
=<br />
=<br />
+<br />
=<br />
=<br />
⋅<br />
−<br />
⋅<br />
−<br />
⋅<br />
→<br />
= K<br />
ϕ<br />
( ) ( )<br />
kNm<br />
GI<br />
M<br />
GI<br />
M<br />
GI<br />
M<br />
U<br />
E<br />
m<br />
kN<br />
mm<br />
N<br />
E<br />
G<br />
mm<br />
N<br />
D<br />
I<br />
M<br />
mm<br />
N<br />
D<br />
I<br />
M<br />
p<br />
B<br />
p<br />
B<br />
p<br />
A<br />
p<br />
p<br />
A<br />
p<br />
B<br />
307<br />
,<br />
0<br />
0137<br />
,<br />
0<br />
0996<br />
,<br />
0<br />
1936<br />
,<br />
0<br />
2<br />
4<br />
,<br />
1<br />
2<br />
2<br />
,<br />
1<br />
2<br />
8<br />
,<br />
0<br />
10<br />
77<br />
,<br />
0<br />
10<br />
77<br />
,<br />
0<br />
3<br />
,<br />
0<br />
1<br />
2<br />
10<br />
2<br />
1<br />
2<br />
63<br />
,<br />
157<br />
2<br />
80<br />
10<br />
4<br />
,<br />
2<br />
10<br />
458<br />
,<br />
9<br />
2<br />
37<br />
,<br />
16<br />
2<br />
120<br />
10<br />
3<br />
,<br />
20<br />
10<br />
54<br />
,<br />
5<br />
2<br />
2<br />
2<br />
1<br />
2<br />
1<br />
2<br />
2<br />
8<br />
2<br />
5<br />
5<br />
2<br />
6<br />
6<br />
1<br />
1<br />
1<br />
max<br />
2<br />
6<br />
6<br />
2<br />
2<br />
2<br />
max<br />
=<br />
+<br />
+<br />
=<br />
⋅<br />
+<br />
⋅<br />
+<br />
⋅<br />
=<br />
=<br />
⋅<br />
=<br />
⋅<br />
=<br />
+<br />
⋅<br />
=<br />
+<br />
=<br />
=<br />
⋅<br />
⋅<br />
=<br />
=<br />
=<br />
⋅<br />
⋅<br />
=<br />
=<br />
ν<br />
τ<br />
τ