Ngày tải lên :
25/04/2013, 08:54
... n
σ
=
71, 13
78,0.9 ,1
65, 21. 51, 1
260
.
1
==
+
−
ma
k
σψσ
βε
σ
σ
σ
σ
n
τ
=
71, 13
9 ,1. 67,0
11 .18 ,1
150
.
1
==
+
−
ma
k
τψτ
βε
τ
τ
τ
τ
= 6,4
=> n =
[ ]
35 ,19 ,8
71, 1379 ,11
71, 13.79 ,11
.
2222
ữ=>=
+
=
+
n
nn
nn
Thoaớ ... )
2
2
2
3
2
6
.85,0
.1
5,0
10 .05 ,1
nb
NKi
ibL
tx
+
−
=
σ
(S
1
CT
3 -15
T
45
)
( )
( )
5,225
584.37.85,0
15 ,7 .11 ,11 5.2
5,237.5, 012 1
10 .05 ,1
2
3
26
1
=
+
−
=
tx
t
σ
N/mm
2
( )
( )
35 ,14 6
14 60.37.85,0
525,7 .11 ,11 5.2
5,237.5, 012 1
10 .05 ,1
2
3
26
2
=
+
−
=
tx
t
σ
... ]
3 ,13 367,35
37 .14 60.2,32.54,2.4 51. 0.85,0
524,7 .11 ,11 0 .1, 19
1
2
6
1
=<==
u
u
N/mm
2
+ ặẽng suỏỳt ún tải chán ràng bạnh låïn:
[ ]
2
1
2
6
1
/1, 111 9 ,12
37.584.37,203.54,2. 517 .0.85,0
15 .7 .11 ,11 0 .1, 19
mmN
u
u
=<==
σσ
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