螺栓扭矩计算

NOTE: Save this master file as a new name and than use new file to do the calculations.

Step 1: Define Bolt & Nut (Boss)

Bolt P/N:

a Method 1: Maximum bolt load based upon shear stress in the bolt thread .

Shear Area, bolt (mm 2

)A s Tensile Load, bolt (N)

P s

a Method 2: Maximum bolt load based upon shear stress in the internal thread .

Shear Area, nut (mm 2)

A i Tensile Load, nut (N)

P i

a Method 3: Maximum bolt load based on tensile failure of bolt .

Tensile stress area, bolt A t Tensile load, bolt (N)

P t a Result : Maximum allowable torque based upon minimum bolt load of 3 methods.

Applicable Load (N)Fi Torque (N.M)

T

Step 3: If there are any thermal effects in the assembly a temperature correction factor may need to be applied to the proof or yield strength.Step 4: Use this torque as a conservative value.

Step 5: If higher torque is required, conduct torque tests and evaluate hardware for yield.

5088.7479

0.2

176513.4521

1682.53725761.1558604397.6152

27.98815088.75

.êëçèçè

ç

çèb t

o do the calculations.

of 3 methods.

ure correction factor

uate hardware for yield.

()úûù

êëé-°+=

m ax ,1m in ,2m ax ,130tan 2D d P P D L e s

A

p ()úû

ùêëé-°+=

m ax ,2m in m ax 30tan 2D d P P d L e i

A

p b

i D KF T =F

A S P

s

i

i

i

577

.0=F

A S P

s

s

t

s

577

.0=2

16/260tan 32/260tan 75.úúû

ùêêëé÷øöçèæ°-÷÷øöççèæ÷÷øöççèæ°-=÷÷÷øöçççèæP P D A b t p s

t t t F A S P /=