The lateral compression of clad tubes owing to a large deformation is examined by an incremental elastic-plastic finite-element method based on an updated Lagrangian formulation, in which a sliding-sticking friction mode is specially considered. It is mainly expected to predict the collapse of clad tubes and the asymmetry of clad tubes during the design stage, before trials. The effects of various parameters in the process, such as geometric ratio R/t, friction coefficient μ and strain hardening exponent n, on the occurrence of collapse and asymmetry of tube are discussed and interpreted in simulations. The findings show that geometric ratio is the major factor in the process of squaring circular tubes. When R/t=25, serious collapse is likely to appear. Aiming at circular tubes with geometric ratio R/t=25, this study proposes six analysis configurations for clad tubes to discuss the possibility of clad tubes avoiding collapse. The findings showed that clad tubes could effectively reduce the collapse ratio and enhance the symmetry of square tubes. The present work may be expected to improve the understanding of the collapse mechanism of lateral compression. (28 refs)
關聯:
Journal of the Chinese Society of Mechanical Engineers
