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A 25mm diameter solid circular section bar made from given material tested is to be
bored axially to produce a cylinder of uniform thickness. If this cylinder is then subjected
to an axial tensile load of 75kN, what is the maximum diameter of the bore possible if the
stress in the cylinder is not to exceed an allowable stress based on a factor of safety of
1.33 of the yield stress
Yield Stress: 320MPa
E: 205GPa
B = bore radius
Calculated allowed stress σ/1.33 = 241MPA
I use σ = F/A
A=F/σ
∏*( r - B)2 = 75000/241MPa
∏*( 0.0125 - B)2 = 75000/241MPa
Is this the right up to now? i have continued to work this out and don't get the correct answer of 5.59 x 10-6
bored axially to produce a cylinder of uniform thickness. If this cylinder is then subjected
to an axial tensile load of 75kN, what is the maximum diameter of the bore possible if the
stress in the cylinder is not to exceed an allowable stress based on a factor of safety of
1.33 of the yield stress
Yield Stress: 320MPa
E: 205GPa
B = bore radius
Calculated allowed stress σ/1.33 = 241MPA
I use σ = F/A
A=F/σ
∏*( r - B)2 = 75000/241MPa
∏*( 0.0125 - B)2 = 75000/241MPa
Is this the right up to now? i have continued to work this out and don't get the correct answer of 5.59 x 10-6