An Investigation of Improved Welded Bellows for Positive Expulsion Applications.
Final summary rept. Mar 70-Jun 71,
BATTELLE MEMORIAL INST COLUMBUS OHIO COLUMBUS LABS
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An analytical and experimental program was conducted to determine whether the tilt-edge concept could be applied to the design of expulsion bellows. Such bellows must endure such large axial displacement that portions of the cross section are subjected to cyclic plastic strains. Expected cycle life is from 2,000 to 20,000 cycles. An analytical study was carried out using Battelles computer codes NONLIN and NONLEP to determine bellows cross sections that gave low weld bead stresses and minimized the maximum stresses. A semi-elliptical cross section with 70 degrees edge tilt was found to give the best overall stress distributions. Although the selected design proved to be difficult to fabricate, bellows were made and tested in low cycle fatigue. The fatigue tests proved that the design did give satisfactory fatigue life performance, even though shell buckling was observed in the leaves. Author
- Containers and Packaging
- Structural Engineering and Building Technology