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Title: Postsynthetic Treatment of ZIF-67 with 5-Methyltetrazole: Evolution from Pseudo-T d to Pseudo-O h Symmetry and Collapse of Magnetic Ordering
Award ID(s):
1953924
PAR ID:
10323839
Author(s) / Creator(s):
; ; ; ;
Date Published:
Journal Name:
Inorganic Chemistry
Volume:
61
Issue:
16
ISSN:
0020-1669
Page Range / eLocation ID:
6056 to 6062
Format(s):
Medium: X
Sponsoring Org:
National Science Foundation
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  1. Viscoelastic shells subjected to a pressure loading exhibit rich and complex time-dependent responses. Here we focus on the phenomenon of pseudo-bistability, i.e. a viscoelastic shell can stay inverted when pressure is removed, and snap to its natural shape after a delay time. We model and explain the mechanism of pseudo-bistability with a viscoelastic shell model. It combines the small strain, moderate rotation shell theory with the standard linear solid as the viscoelastic constitutive law, and is applicable to shells with arbitrary axisymmetric shapes. As a case study, we investigate the pseudo-bistable behaviour of viscoelastic ellipsoidal shells. Using the proposed model, we successfully predict buckling of a viscoelastic ellipsoidal shell into its inverted configuration when subjected to an instantaneous pressure, creeping when the pressure is held, staying inverted after the pressure is removed, and eventually snapping back after a delay time. The stability transition of the shell from a monostable, temporarily bistable and eventually back to the monostable state is captured by examining the evolution of the instantaneous pressure–volume change relation at different time of the holding and releasing process. A systematic parametric study is conducted to investigate the effect of geometry, viscoelastic properties and loading history on the pseudo-bistable behaviour. This article is part of the theme issue 'Probing and dynamics of shock sensitive shells'. 
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