| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 92 === Open-cell foams are typically used as core materials in lightweight sandwich panels which are always subjected to a general state of multiaxial stresses. Thus, the mechanical properties and the failure criteria corresponding to different failure mechanisms for open-cell foams under multiaxial stresses are essential and important to the structural integrity of lightweight sandwich panels. Since open-cell foams are normally anisotropic due to processing, their mechanical properties will be affected by their cell geometry, namely the anisotropy ratio. In this paper, the failure envelopes of anisotropic open-cell foams are generated and presented. Different failure mechanisms including plastic yielding, brittle crushing, elastic buckling and fracturing are taken into account to construct the failure envelopes of anisotropic open-cell foams. For the case of axisymmetric stress state, the effects of the anisotropy ratio on the mechanical behavior and the failure envelopes of open-cell foams are evaluated.
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