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The collapse timing and rate of closed cell foams: revealing a conceptual misunderstanding of foam mechanics

conference contribution
posted on 2024-10-31, 09:28 authored by Franz Fuss
The collapse stress and strain was determined in a closed cell PE foam according to the traditional method (intersection of tangents at the linear elastic segment and at the beginning of the collapse plateau) and a new method presented in this article. The new model consists of a normalized number of elements; each element comprises the vertical cell wall members, in parallel with the cell gas and the horizontal members, the latter two in series. The vertical members have two different moduli, depending on the pre- and post-buckling phase. From this model, the normalized number of buckled elements and its collapse rate are calculated as a function of strain and stress, and the onset of foam collapse is determined. The new method delivers a collapse strain of 0.0224±0.0013; at the collapse strain determined with the traditional method (0.0634±0.0048), on average 93% of all vertical members are already buckled. The traditional method is incorrect as the foam starts to collapse once its modulus decreases.

History

Start page

659

End page

664

Total pages

6

Outlet

The Impact of Technology on Sport III

Editors

Alam F, Smith LV, Subic A, Fuss FK, Ujihashi S

Name of conference

4th Asia Pacific ongress on Sports Technology

Publisher

RMIT University

Place published

Melbourne, Australia

Start date

2009-09-21

End date

2009-09-23

Language

English

Copyright

© RMIT University 2009

Former Identifier

2006015266

Esploro creation date

2020-06-22

Fedora creation date

2011-09-09

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