【作者】 章晨； 何思渊； 赵炜； 汤国艺；

【Author】 Zhang Chen;He Siyuan;Zhao Wei;Tang Guoyi;Southeast University, School of Biological Science & Medical Engineering;Southeast University, School of Materials Science and Engineering;

【机构】 东南大学生物科学与医学工程学院； 东南大学材料科学与工程学院；

【摘要】 本研究以泡沫铝多孔结构为研究对象,采用有限元模拟的方法,对三点弯加载下多孔结构的受力情况和阻尼性能进行了研究。通过熔体发泡法制备闭孔泡沫铝样品并进行计算机断层扫描,对扫描结果进行二值化、平滑化等处理后,重建了样品的三维多孔结构和对应的有限元模型。使用Abaqus软件模拟振动实验的三点弯振动加载过程,通过多孔结构的弹、塑性应变能计算了泡沫铝的损耗因子。结果表明:振动载荷下多孔结构整体处于弹性变形阶段时,泡沫铝的非有序应力承载多孔结构产生不均匀的应力场,使得部分孔壁结构产生塑性变形;尽管在卸载后变形恢复,其局部塑性变形过程仍形成振动能量耗散,而产生阻尼效果。通过模型弹、塑性应变能计算获得的泡沫铝损耗因子与实验测量结果吻合,且随着振幅的增大呈上升趋势。更多还原

【Abstract】 In this study,the mechanical and damping properties of the aluminium foam porous structure under three-point bending loading were investigated by means of FEM simulation.Closed-cell aluminium foam samples were obtained by the melt foaming method and subjected to computed tomography scanning.After binarization and smoothing of the scanning results,the three-dimensional porous structure of the samples and the corresponding finite element models were reconstructed.The loss factor of the aluminium foam was calculated from the elastic and plastic strain energy of the porous structure using Abaqus software to simulate the three-point bending vibration loading process of the vibration experiment.The results show that the unordered stress-bearing porous structure of aluminium foam produces an uneven stress field when the porous structure as a whole is in the elastic deformation phase under vibratory loading.The aluminium foam part of the pore wall structure produces plastic deformation,and the plastic deformation process forms vibration energy dissipation,thus producing a damping effect.The aluminium foam loss factor obtained from the model elastic and plastic strain energy calculations agrees with the experimental measurements and shows an increasing trend with increasing amplitude.更多还原