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Shear Flow Calculation

Shear Flow Calculation

Shear Flow Calculation

(OP)
What is the best method to calculate shear flow (longitudinal shear).  I have a method that I have been using, I was just wondering if someone else did it differently.  Just let me know if you have ideas.

RE: Shear Flow Calculation

I use f (shear flow) = VQ/I.  V = shear force, Q = statical moment, I = moment of inertia.  That assumes elastic behavior for a homogeneous elastic material and plane sections remain plane (linear strain distribution).

RE: Shear Flow Calculation

(OP)
That's what I use now, but it equates to psi.  How do you then use that to determine fastener requirements on that plane?

RE: Shear Flow Calculation

VQ/I ends up with kips/inch or pounds/inch.

Kips x  In^3  /  In^4  = kips/inch

RE: Shear Flow Calculation

It is force/length. F*L^3/L^4 = F/L

You might be thinking of tau = VQ/It where t is the thickness of the section at that location.  That is stress.

RE: Shear Flow Calculation

(OP)
You're right.  That's what I normally use.  Sh=VQ/Ib.  I omitted the b in this case and divided the lb/in result into the allowable shear force for the fasteners I'm using to determine the longitudinal spacing in inches.  Thanks for the help.

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