Application of a continuum constitutive model to metallic foam DEN-specimens in compression

✍ Scribed by P.R. Onck

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 254 KB
• Volume: 43
• Category: Article
• ISSN: 0020-7403
• DOI: 10.1016/s0020-7403(01)00060-1

✦ Synopsis

The behavior of double-edge notched specimens of metallic foams in compression is studied numerically. To model the constitutive behavior of the metallic foam, a recently developed phenomenological, pressure-sensitive yield surface [1] is used. Compressive yielding in response to hydrostatic stress is incorporated through a dependence on the plastic Poisson ratio p . Results are presented in terms of limit load F lim , as a function of notch depth, a=W , and the plastic Poisson ratio p . For incompressible plastic behavior, p = 0:5, the results show notch-strengthening due to constrained plastic deformation near the crack=notch-tip. For fully compressible plastic behavior (no lateral expansion on uniaxial compression, p = 0), no notch-e ect is observed. The validity of using a continuum model for the analysis of metallic foam notched specimens is discussed.