Question

The torsion moment effecting a shaft, which was manufactured by hot drawing method, changes between 330 and -110 Nm. The bending moment changes between 440 and -220 Nm. The tensile strength of the shafts material is 550 MPa, the yield strength of it is 410 MPa. Find the radius of the shaft.(Coefficient of safety is 1.5)

Factor of dent sensitivity: 1.0

Factor of size: 0.85

Factor of surface flatness/levelness: 0.62

Answer 1

Tmin=-110Nom با 7/So Tmon = 330Nm Mmor = 440 Nm Monen -220N.m Mmont M min 440-220 -110 Nm 2 2 - 110 N-m Tm = Tamox Tanay +T min 2 330-110 2 32x11 6 T = 16T 71d3 32 mm Td3 16x11o Td3 - π d3 560.23 1120.45 てこ 03 [1120.45 d3 712005724615b 23 JVU 87, 82 = ₃ [ob I J OG? +422 0,15= [ 120 05 1534.54 mox = 0, = 13525 d 3 - min 2 = -232.055 a3 Omon tomin 560.22 Ion = 1352.5-232-055 2d3 23 ment- omin 792.28 1352.5+232.055 2013 2 d3 So=0.5 Sut = 0.58550=275 MPa Su = 410 MPa Se kako ke se = 1X.858.62x275 se = 144.925 MPa Soderbergan Oa 1 Om t Syt {N=15

스 + 560122 792.28 < d3(410)8206 d3 (144.925x105 1.5 d32 1.58560.22 lisx792.28 4 108 106 144.9258106 2.0496X166 + g. 2x f 1006 d d = 21.72 mm 18=10.86mm Ans