期刊
ACTA MATERIALIA
卷 49, 期 10, 页码 1859-1866出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S1359-6454(01)00058-1
关键词
foams; constitutive equations; yield surface
The yield behaviour of two densities of a ductile PVC foam manufactured by Divinycell have been investigated for a range of axisymmetric compressive and tensile stress states. The yield surface is found to be described adequately by the inner envelope of a quadratic function of mean stress and effective stress and a maximum compressive principal stress criterion. Under tensile loadings the deformation of these foams is governed by cell wall bending, and the uniaxial and hydrostatic tensile strengths have comparable magnitudes. Under compressive loadings the foams deform by elastic buckling of the cell walls, and the uniaxial and hydrostatic compressive strengths are again nearly equal. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
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