Abstract
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 ν p. Results are presented in terms of limit load F lim, as a function of notch depth, a/ W, and the plastic Poisson ratio ν p. For incompressible plastic behavior, ν 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, ν p=0), no notch-effect is observed. The validity of using a continuum model for the analysis of metallic foam notched specimens is discussed.
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