Hey all,
Does anyone have experience with this flavor steel? A286 mfr. per SAE AMS 5726 Apparently it is supposed to have a UTS = 200 ksi...Is this the strongest steel available?
Thanks,
TJ
Geesamand,
I think I will be heading down the road of running my own test....Has anybody ever modified bolts with strain gauges before? Or has anyone ever bought quality commercial strain gauge bolts?
I looked on-line very briefly and only found one commercial company, Strainsert or...
Yes, I am mostly concerned about loss of pre-load when you go from ambient to the max cold operating temp. I think you are correct that the impact of the helicoil on this effect would be very small. The temp does cycle at some rate from -185F to +185 F...
At cold temp the aluminum will...
I agree with MintJulep unless someone else can convince me otherwise...For calculating the stiffness of the helicoil (simply, without using frustum cone angles etc...), do you think it is appropriate to assume that it is the stiffness of a hollow cylinder, with effective area:
A_eff =...
Thanks Tmoose,
The fastener is A286 steel, right now the clamped material is 6061-T6 (although I'm pushing to go with 7075-T6) and the helicoil will likely be some austentitic nickle steel.
The grip length the bolt is approximately 0.28125", and I'm not sure if I can ask Emhart to make...
Edit:
Forgetting about how each stiffness is calculated for now then the joint stiffness might be like:
k = [(1/k_fastener) + (1/k_helicoil) + (1/k_clamped_material)]^-1
Thanks rb1957 and CoryPad,
I did pullout calculations based:
pullout = (pi*pitch_diameter*E_shear_aluminum*L_thread)/3
and am not too worried about that based on the pre-load I want to put on the #6, but I am most concerned in calculating the stiffnesses for our thermal environments, -185F...
Hey all, first time posting here...
I've been wondering how a Heli-Coil insert (or similiar type threaded insert) would affect the stiffness calculations in a blind tapped hole.
We are working with #6-32 A286 strain hardened fasteners with 180 ksi yield strength, with 6061-T6 aluminum clamped...
