Comparative studies of localized buckling in sandwich struts with different core bending models
Journal
International Journal of Non-Linear Mechanics
Date Issued
March 2010
DOI
10.1016/j.ijnonlinmec.2009.10.001
Abstract
Analytical models with geometric non-linearities accounting for interactions between local and global
instability modes leading to localized buckling in sandwich struts are formulated. For the core material
response, two increasingly sophisticated bending models are compared against each other: Timoshenko
beam theory (TBT) and Reddy–Bickford beam theory (RBT). Numerical solutions of the analytical
models are validated with the commercial finite element code ABAQUS. It is found that there is a small
but significant difference in the critical load between the two models and that the previously obtained
solution slightly underestimates the linear buckling strength. More importantly, it is found that the RBT
model predicts the onset of interactive buckling before the TBT model and, according to the results from
the finite element study, matches the actual behaviour of a strut in both its initial and advanced postbuckling
states with excellent correlation.
instability modes leading to localized buckling in sandwich struts are formulated. For the core material
response, two increasingly sophisticated bending models are compared against each other: Timoshenko
beam theory (TBT) and Reddy–Bickford beam theory (RBT). Numerical solutions of the analytical
models are validated with the commercial finite element code ABAQUS. It is found that there is a small
but significant difference in the critical load between the two models and that the previously obtained
solution slightly underestimates the linear buckling strength. More importantly, it is found that the RBT
model predicts the onset of interactive buckling before the TBT model and, according to the results from
the finite element study, matches the actual behaviour of a strut in both its initial and advanced postbuckling
states with excellent correlation.