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righteous29
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Join Date: Mar 2016
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Statics Question

03/07/2016 8:19 AM

A circular rod with diameter of "D" is joined at its flange by 8 M6 bolts on a160mm PCD as shown in Figure Q.2. The bolts have a tensile yield strengthof 425MN/m2, and the rod has a Shear Modulus 78GN/m2 and a tensile yieldstrength of 375MN/m2. Determine:a) the Force "F" that can be applied to the handle with a factor of safetyof 2.6;b) the diameter "D" of the rod for the loading found in (a) above;c) the rate of twist the assembly will experience for the diameter "D" andthe loading found in (a) above
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Tom_Consulting
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#1

Re: Statics Question

03/07/2016 8:59 AM

Let us know when you have the answer figured out. This is not a homework site.

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Fredski
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#2
In reply to #1

Re: Statics Question

03/07/2016 9:04 AM

at least it isn't high school math
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lyn
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#3

Re: Statics Question

03/07/2016 9:22 AM

Check your statics textbook or Google for the answer.

See #1.
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SolarEagle
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#4

Re: Statics Question

03/07/2016 11:38 AM

Whatsa PCD??

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lyn
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#5
In reply to #4

Re: Statics Question

03/07/2016 12:15 PM

Could be: Primary Ciliary Dyskinesia ; Post Concert Depression ;Perfumes, cosmetics and design ; Preventing Chronic Disease ; or maybe pitch circle diameter.

In any case, it still looks like homework.
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SolarEagle
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#7
In reply to #5

Re: Statics Question

03/07/2016 1:42 PM

It says 8 bolts, but I see 11 and suspect 12....I hip shot guess 893 ftlbs...

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#8
In reply to #7

Re: Statics Question

03/07/2016 2:06 PM

I can't see the 11th one, though it might be behind the shaft.

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SolarEagle
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#9
In reply to #7

Re: Statics Question

03/07/2016 2:40 PM

http://www.calculatoredge.com/new/youngmodulus.htm

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nick name
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#17
In reply to #7

Re: Statics Question

03/08/2016 5:51 AM

You have a very accurate hip shot GA
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Anonymous Poster #1
#15
In reply to #4

Re: Statics Question

03/08/2016 5:19 AM

pitch circle diameter.
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#6

Re: Statics Question

03/07/2016 12:32 PM

Do we get to assume that the joints between the rod, the flanges, and the handle have unlimited strength?

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BruceFlorida
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#10

Re: Statics Question

03/07/2016 4:05 PM

You should be nice to this guy. The picture looks like he is working on an ECO for the Chevy Cavilar axle and wheel hub.

If he is not then the answer is probably "C".

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lyn
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#11

Re: Statics Question

03/07/2016 6:31 PM

This is a joke!

No, it's an insult.

Flange leader points to a bolt.

Bolt leader points to the flange, and the student can't count.

<Beaming up>
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IdeaSmith
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#12

Re: Statics Question

03/07/2016 9:14 PM

If this is steel you wont break it with a short enough handle.

Even if you try jumping on the handle.

Let us know if you figured it out!

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#13

Re: Statics Question

03/08/2016 4:34 AM

Homework from school maybe? Or any other type or training establishment?

I don't do homework, done enough of it years ago.....

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#14

Re: Statics Question

03/08/2016 4:56 AM

It can't be done, there are too many unknowns. First you ask for F in terms of D, then D in terms of F.

But it's an interesting problem. Depending on D, it might be limited by torsional shear stress in the rod (probably envisaged by the setter), or the torque capacity of the flanged joint. The bolt size and UTS (but not shear strength) are given. Could be limited by bolt shear stress or friction between the flange faces, which depends on actual bolt stress, also not given.

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#16

Re: Statics Question

03/08/2016 5:50 AM

The handle force is 19.23MN/m2. The rod, is it solid or tubular?
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Codemaster
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#18
In reply to #16

Re: Statics Question

03/08/2016 7:32 AM

Perhaps I'm being slow, but is that a joke? MN/m2 is stress, not force.

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#19
In reply to #18

Re: Statics Question

03/08/2016 9:27 AM

You are NOT slow the guy is not on the right track.
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Codemaster
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#20
In reply to #19

Re: Statics Question

03/08/2016 10:08 AM

OK thanks, reading your reply #17 to SolarEagle's #7 I thought maybe I was missing something. If the 893 ft.lbf is meant to be the torque the flanged joint (8 bolts) will take, I'd go along with that.

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Users who posted comments:

Andy Germany (1); Anonymous Poster (2); BruceFlorida (1); Codemaster (3); Fredski (1); IdeaSmith (1); lyn (3); nick name (2); SolarEagle (3); Tom_Consulting (1); Tornado (2)

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