研究集中载荷作用下金属泡沫夹芯梁的准静态压入力学行为。考虑到夹芯梁表板弯曲和拉伸的相互作用，提出了一个金属泡沫夹芯梁局部压入大挠度变形行为的新理论模型，并详细讨论芯材剪切对局部压入行为的影响。为了验证理论模型的有效性，对夹芯梁的局部压入行为进行有限元数值模拟，理论预测结果与有限元模拟结果吻合得很好。结果表明：当压入挠度超过夹芯梁表板厚度后，塑性膜力控制着夹芯梁的局部压入行为。%The quasi-static indentation behavior of sandwich beams with a metal foam core was investigated. An analytical model was developed to predict the large deflections of indention of the sandwich beams with a metal foam core subjected to a concentrated loading. The interaction of plastic bending and stretching in the local deformation regions of the face sheet was considered in the analytical model. Moreover, the effects of the shear strength of the foam core on the indentation behavior were discussed in detail. The finite element simulations were preformed to validate the theoretical model. Comparisons between the analytical predictions and finite element results were conducted and good agreement was achieved. The results show that the membrane force dominates indentation behavior of the sandwich beams when the maximum deflection exceeds the thickness of the face sheet.
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