Effect of pitch for Composite joints
Effect of pitch for Composite joints
(OP)
I was trying to think of the effect of large pitch distances for single lap composite parts. Normally the pitch distance between the rows is low. What would happen if you were to increase that to lets say 10-15 in, making the joint a very long joint. Would the first row have to be sized for the entire load(conservatively), rendering it ineffective? I can't really imagine that there is no difference in the way you share the load between two rows if you increased the pitch.





RE: Effect of pitch for Composite joints
I suspect that the load distribution between the two rows would be 50/50, since I imagine the two skins are similar in thickness.
fay sealant is your friend ... in real life it would act as a bond, but not something you'd include in your analysis.
another day in paradise, or is paradise one day closer ?
RE: Effect of pitch for Composite joints
But 15" between fastener would be a very odd (absurd) joint.
RE: Effect of pitch for Composite joints
But as composites "always" rely on experimental data, after your simulations, your actual structural tests will asses if you were too conservative/unconservative depending on the direction/type of your loading.
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: Effect of pitch for Composite joints
another day in paradise, or is paradise one day closer ?
RE: Effect of pitch for Composite joints
1.15 is about right. Thanks for the correction Sir!
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: Effect of pitch for Composite joints
RE: Effect of pitch for Composite joints
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: Effect of pitch for Composite joints
for composite joints, the thing I know is e/D needs to be >3 (ie higher than Al).
another day in paradise, or is paradise one day closer ?
RE: Effect of pitch for Composite joints
e/d while usually good practice to be 3 or more can be whatever you want as long as you have static and fatigue test data to cover it.
RE: Effect of pitch for Composite joints
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: Effect of pitch for Composite joints