tomcrooks
Aerospace
- Oct 12, 2012
- 8
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 material. Initially I am thinking that you would just assume that the Heli-Coil and the fastener are "one" in the area that the Heli-Coil and the fastener are in contact (threaded region of bolt)...Then you would have a series stiffness calculation for the fastener something like:
k_fastener_total = [(1/k_head) + (1/k_shank) + (1/k_fastener-helicoil)]^-1
Does that sounds right? Anyone else do this differently? Appreciate the comments.
Thanks,
T.J. Crooks
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 material. Initially I am thinking that you would just assume that the Heli-Coil and the fastener are "one" in the area that the Heli-Coil and the fastener are in contact (threaded region of bolt)...Then you would have a series stiffness calculation for the fastener something like:
k_fastener_total = [(1/k_head) + (1/k_shank) + (1/k_fastener-helicoil)]^-1
Does that sounds right? Anyone else do this differently? Appreciate the comments.
Thanks,
T.J. Crooks