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DYNA

versão impressa ISSN 0012-7353

Resumo

GRACIANO, Carlos; MARTINEZ, Gabriela  e  SAAVEDRA, Edwar. Effect of elastoplastic behavior on the impact response of expanded metal tubes. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.198, pp.102-109. ISSN 0012-7353.  http://dx.doi.org/10.15446/dyna.v83n198.50010.

This paper presents a numerical study on the effect of the elastoplastic behavior of the material on the structural response of expanded metal tubes subjected to impact loads. The study is carried out using the finite element method, considering two material models. Firstly, a numerical model is built assuming a bilinear behavior with strain hardening. Secondly, a model is elaborated considering the speed of deformation using the correlation of Cowper-Symonds. These models are compared and validated with experimental results taken from the literature. Subsequently, a parametric study is conducted, varying the dimensions and orientation of the mesh as well as the impact speed. The results show that the response of expanded metal tubes is sensitive to changes in the orientation of the geometrical axes of the mesh. Increasing the dimensions of the strands increase the material available for plastic deformation, this, in turn, produces an increase in the energy absorbed per mass unit. In addition, the loading speed causes a delay in the response of the specimens.

Palavras-chave : Expanded metal; Plasticity; Axial impact; Energy absorption; Dynamic response.

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