Stress waves in layered cellular materials-Dynamic compaction under axial impact

Autor(es)

Karagiozova, D. ^[1] ; Alves, M. ^[2]

Afiliação do(s) autor(es)

^[1] Bulgarian Acad Sci, Inst Mech, BU-1113 Sofia - Bulgaria

^[2] Univ Sao Paulo, Dept Mechatron & Mech Syst Engn, Grp Solid Mech & Struct Impact, BR-05508900 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES; v. 101, p. 196-213, OCT 2015.
• Citações Web of Science: 11

Resumo

Theoretical analysis of the propagation of stress waves in layered cellular solids with different densities, and consequently strengths, is carried out to deepen the understanding of their dynamic compaction due to impact loading. The cellular topology is neglected and homogeneous properties are assumed. Two types of plastic waves are distinguished depending on the layers density arrangement. Only waves of strong discontinuity occur when the layers' densities increase in the direction of propagation of the primary wave. Multiple reflections of the stress waves from the layer interfaces are identified and studied for this type of the layers density arrangement. Simultaneous propagation of a wave of strong discontinuity in the proximal layer and a simple wave in the subsequent layers occur when the layers' densities decrease in the direction of propagation of the primary wave. Two types of loading conditions: an impact of a stationary cellular block by a rigid mass and an impact of a cellular block on a rigid wall are analysed. It is assumed that the constituent materials in the layered solids exhibit strain hardening. The plastic strain is sought as a function of the impact velocity and material properties when using the characteristic Hugoniot strain-velocity relationship. FE models using ABAQUS are constructed and numerical simulations are carried out to verify the predictions of the theoretical analysis. The potential of layered cellular materials to design more efficient structural components when subjected to intensive dynamic loading is briefly discussed when comparing the response of some layered configurations with their uniform density counterparts of equal mass. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 13/10884-3 - Propagação de ondas de compactação em materiais celulares gradados sujeitos a cargas de impacto
• Beneficiário: Marcílio Alves
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional