Lifting Lug Calculation-1

LIFTING LUG STRESS CALCULATION-For Neutra Skid Material Selection

JIS SS400

Sy=

235 N/mm2

Thickness of Lug Width of Lug Lug Outer Radius Diameter of Lug hole Height to hole Center Fillet Weld Leg Partial Groove Weld Critical Weld Section Weld Joint Efficiency

T B R D h S1 S2 S E

Skid Weight Impact Factor Design Weight Number of Lugs Design Weight per Lug

W=Wd/N

We C Wd N W

Ft=W/Sin β Fx=Ft x Cos β Fy=Ft x Sin β

β Ft Fx Fy

1500 1.5 2250 4 562.5 5512.5 45 7795.852 5512.5 5512.5

Ss=Ft/[2x(R-D/2)xT] St=Fy/[2xR-D)xT] Z=B² x T/6 A=B x T Sb=Fx x h/Z+Fy/A

Ss St Z A Sb

31.18341 22.05 4166.667 mm³ 500 mm² 63.945 N/mm²

S1=Fx x h/Zw S2=Fx/Aw S=SqRt(S1²+S2²)

S1 S2 S

18.71287 N/mm2 3.898515 N/mm2 19.11465

S3=Fy/Aw Zw=Sx(B)²/3 Aw=Sx2(B)

S3 Zw Aw

3.898515 N/mm2 11783.33 mm3 1414 mm2

Lifting Angle Tension in Sling Force

Shear Stress of Lug at Eye Tensile Stress of Lug at Eye Bending Stress of Lug at Base

Stress of Weld Fron force Fx, Bending Shear Combined From Force Fy, Shear

Wd=C x We

Max Combined Stress due to Fx + Fy, S=SQRT[(S1+S3)²+S2²] S

10 50 25 25 40 10 6 14.14 0.6

22.945

mm mm mm mm mm mm mm mm

kg kg kg N ° deg N N N < <

94 N/mm2 141 N/mm2

OK OK

<

141 N/mm2

OK

<

56.4 N/mm2

OK

<

56.4 N/mm2

OK

SPREADER BAR DURING LIFTING IS RECOMMENDED