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Experimental investigation on the yield behavior of metal foam under shear-compression combined loading |
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| Authors: | Luo Geng Xue Pu Li YuLong |
| Affiliation: | 1.School of Automobile, Chang’an University, Xi’an, 710064, China ;2.School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China ;3.Joint International Research Laboratory of Impact Dynamics and its Engineering Applications, Northwestern Polytechnical University, Xi’an, 710072, China ; |
| Abstract: | Metal foams are typically subjected to quasi-static or dynamic shear-compression combined loading in applications such as energy absorbers and structure protectors. The yield behavior of a metal foam under dynamic and quasi-static shear-compression combined loadings is investigated in this study. First, quasi-static and dynamic compression-shear combined tests at different loading angles are conducted using a universal testing machine and a rotatable Hopkinson bar system, respectively. Shear deformation reduces the plateau stress as the loading angle increases. Subsequently, the yield modes of the metal foam under combined loadings are investigated. Only one yield band occurs under a combined loading with large loading angles(mode I),whereas several yield bands occur under a combined loading with small loading angles(mode II). Finally, the yield surface plot of metal foam indicates significant enhancement in terms of normal stress and shear stress under dynamic loading. Quasi-static and dynamic phenomenological yield criteria for a shear-normal stress space are established to provide a brief and precise prediction of the behavior of metal foam under quasi-static and dynamic combined loadings. |
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