Projects per year
Abstract
Shell buckling is known for its extreme sensitivity to initial imperfections. It is generally understood that this sensitivity is caused by an unstable (subcritical) bifurcation, i.e. geometric imperfections rapidly erode the buckling load of the perfect shell. It is less commonly appreciated that subcriticality also creates a strong proclivity for spatially localised buckling modes. The ability of localisations to appear anywhere across the domain (spatial multiplicity) leads to a large set of possible trajectories to instability, with each trajectory affine to a particular imperfection signature. Using a toy model of a link system on a softening elastic foundation, we show that the spatial multiplicity of localisations leads to a large spread in buckling loads, even for indistinguishable random imperfections of the same amplitude. By imposing a dominant imperfection, the strong sensitivity to random imperfections is ameliorated, and the ability to control the trajectory to buckling via dominant imperfections or elastic tailoring, creates interesting possibilities for designing imperfection-insensitive shells.
Original language | English |
---|---|
Publication status | Published - Mar 2020 |
Event | American Physical Society March Meeting - Denver, United States Duration: 2 Mar 2020 → 6 Mar 2020 |
Conference
Conference | American Physical Society March Meeting |
---|---|
Country/Territory | United States |
City | Denver |
Period | 2/03/20 → 6/03/20 |
Fingerprint
Dive into the research topics of 'Investigating imperfection-sensitivity in shell buckling using a toy model'. Together they form a unique fingerprint.Projects
- 1 Finished
-
Structural Efficiency and Multi-functionality of Well-Behaved Nonlinear Composite Structures
Pirrera, A. (Principal Investigator)
1/04/15 → 31/08/20
Project: Research
Prizes
-
Royal Academy of Engineering Research Fellow
Groh, R. (Recipient), 2018
Prize: Prizes, Medals, Awards and Grants