2.1 a) ZATEZANJE
111 k111 nz F 25 kN nz 6.9 2 b h 3.6 1 cm p B 2 48 k 111 f ; f ; 2.3 b b 32 36 kN 111 2.3 6.9 15.87 2 cm 121 k121 nz F 25 kN nz 4.5 2 b h 5.6 1 cm p B 4 68 k 121 f ; f ; 2 b b 56 56 kN 121 2 4.5 9 2 cm __________________________________________________ 211 k 211 nz F 4F 4 25 100 kN nz 2 2 2.46 2 d d 12.96 40.7 cm 4 p d 2 36 k 211 f ; f ; 2.3 t D 6 48 D d 48 36 t 6mm 2 2 kN 211 2.3 2.46 5.658 2 cm 221 k 221 nz 4F 4 25 100 kN nz 2 1.016 2 d 31.36 98.47 cm p d 4 56 k 221 f ; f ; 2 t D 6 68 D d 68 56 t 6mm 2 2 kN 221 2 1.016 2.032 2 cm _____________________________________________________
b) SAVIJANJE
112 k112 nz M M 6M 6 14 kN nz 6.48 2 2 2 W h b h b 1 12.96 cm 6 p b 2 48 k 112 f ; f ; 2.2 b B 36 36 kN 112 2.2 6.48 14.256 2 cm M M 6M 6 14 kN nz 2.67 2 2 2 W h b h b 1 31.36 cm 6 p b 4 68 k 122 f ; f ; 1.9 b B 56 56 kN 122 1.9 2.67 5.073 2 cm 212 k 212 nz M M 32 M 32 14 kN nz 3.058 2 3 3 W d d 46.656 cm 32 p d 2 36 k 212 f ; f ; 2.2 t D 6 68 Dd t 6mm 2 kN 212 2.2 3.058 6.728 2 cm 222 k 222 nz M M 32 M 32 14 kN nz 0.81 2 3 3 W d d 175.6 cm 32 p d 4 56 k 222 f ; f ; 1.9 t D 6 68 kN 222 1.9 0.81 1.54 2 cm
c) UVIJANJE
213 k 213 nt T 16 T 16 18 kN nt 1.966 2 3 3 d d 46.656 cm 16 p d 2 36 k 213 f ; f ; 1.6 t D 6 48 kN 213 1.6 1.966 3.1456 2 cm 223 k 223 nt T 16 T 16 18 kN nt 0.52 2 3 3 d d 175.6 cm 16 p d 4 56 k 223 f ; f ; 1.4 t D 6 68 kN 223 1.4 0.52 0.728 2 cm ____________________________________________________________ TABELARNI PRIKAZ REZULTATA PRORACUNA Broj Slike
Dimenzija
1
1 2 1 2
2
Zatezanje(1) 15.87 9 5.658 2.032
Vrste opterećenja Savijanje(2) 14.256 5.073 6.728 1.54
Uvijanje(3) 3.1456 0.728
2.2 a) ZARTEZANJE Re 390MPa D ( 1) z 0.425 Rm 0.425 610 259.25MPa
D (0) z 0.54 Rm 0.54 510 329.4 MPa D (0) z D ( 1) z 2 1 D ( 1) z D (0) z D (0) z 2 arctg 0.4259 23.07 0 _____________________________
259.25 2 1 0.4259 329.4
tg z
b) Savijanje Res 1.5Re 1.5 390 585MPa D ( 1) s 0.47 Rm 0.47 610 286.7 MPa
D (0) s 0.72 Rm 0.72 610 439.2 MPa D (0) s D ( 1) s 2 1 D ( 1) s D (0) s D (0) s 2 arctg 0.69 34.770 _______________________________ tg s
286.7 2 1 0.694 439.2
c) UVIJANJE Reu 0.7 Re 0.7 390 273MPa D ( 1)u 0.325 Rm 0.325 610 198.25MPa
D (0)u 0.38 Rm 0.38 610 231.8MPa D (0)u D ( 1)u 2 1 D ( 1) u D (0)u D (0)u 2 arctg 0.289 16.140 tg u
198.25 2 1 0.289 231.8
2.3 Dinamička idržljivost mašinskog dijela D ( 1) M D ( 1)e KD D ( 1) M -dinamička izdržljivost mašinskog dijela
D ( 1) e - dinamička izdržljivost epruvete KD - factor dinamička izdržljivost 1 0.84 0.95 1 1 2 3 0.433 K D 2.31 KD K 1.864 k ( k 1) k 1 1 f (d 36) 0.85 2 0.95 3 1 k 0.72 p D 2 48 k f ( ; ) f ( ; ) 2.2 d d 36 36 k (2.2 1) 0.72 1 1.864 D ( 1) e 0.47 Rm 286.7 MPa 286.7 124.11MPa 2.31 2 tg M 1 (1 D ( 1) e ) 1 2 3 D (0) s k
D ( 1) M
D (0) s 0.72 Rm 439.2 MPa 573.4 tg M 1 (1 ) 0.433 0.867 439.2 tg M arctg 0.867 40.950 a) sr const. 130 MPa DM D ( 1) M sr tg M 124.11 130 0.867 236.82 MPa b) d const. 125MPa 0.5 d tg M 124.11 62.5 0.867 178.29 DM D ( 1) M 314.72 MPa 1 0.5tg M 1 0.5 0.867 0.5665
63.40
c) sr 0.3 g ctg sr 0.3 g
73.30 DM
D ( 1) M 124.11 167.74MPa (1 ctg tg M ) (1 0.3 0.867)