How long can a rotary shaft flexible coupling be expected to last in service ?

1. FLEXIBLE COUPLING
FOR
TORQUE TRANSMISSION
2/17/2018 rev A
Don Blanchet
3B Associates
dwb3298@verizon.net
Prepared for Parry Sound LTD Ontario, CA
Estimate life using
Finite element stress analysis

2. Typical Application

3. Rotary motion: managing
shaft misalignment

4. Solid model – mild
alloy steel
0.2 inch to 0.3 inch flexible adapter
Shafts centerlines are misaligned by 0.01 inch

5. Side view .020 helical cut

6. Fea mesh

7. Torque loading
Applied torque
& misalignment Fixed end

8. Magnified distortion

9. Stress loading reversing
fatigue as coupling turns

10. Expected range of
service life