| 韩春光,汤立群*,黄小清.材料非均匀性对泡沫金属拉伸性能的影响[J].实验力学,2011,26(3):234~239 |
| 材料非均匀性对泡沫金属拉伸性能的影响 |
| Effects of Material Heterogeneity on the Tensile Properties of Metal Foams |
| 投稿时间：2010-09-10 修订日期：2010-12-14 |
| DOI： |
| 中文关键词: 泡沫金属 非均匀性 准静态拉伸 破坏特征 |
| 英文关键词:metal foam heterogeneity quasi-static tension failure characteristics |
| 基金项目:国家自然科学基金资助项目(批准号: 10872070， 90916026) |
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| 中文摘要: |
| 通过对开孔泡沫铝进行拉伸实验，考察了泡沫金属材料的非均匀性对其拉伸性能的影响。首先，通过分析同一批试件的初始密度，考察了材料的初始非均匀性；其次，重点考察了初始密度对材料破坏特性的影响。分析表明，即使初始密度比较接近的试件，它们的破坏应力和应变也有较大的离散性；对于不同初始密度的试件，破坏强度有随初始密度的增加而变大的趋势，但破坏应变则无明显的变化规律。因此，对于泡沫金属这种细观结构非均匀性比较严重的材料，仅仅使用初始密度尚不足以刻画其材料特征。对泡沫铝的拉伸破坏特性进行了图像分析，结果表明，材料的拉伸破坏主要是由拉伸后期才出现的细观结构破坏引起的。这说明，早期的拉伸非线性特征主要是由材料的强非均匀性导致基体材料屈服而引起的。 |
| 英文摘要: |
| Experimental investigation of material heterogeneity effect on the tensile properties of metal foam was carried out. Firstly, the material initial heterogeneity was reviewed by analyzing the initial density of specimens of the same group. Next, the review was focused on the effect of initial density on the material failure characteristic. Analytical results show that even for specimens with approximate same initial density, their failure stress and strain still present obvious discreteness. And for the specimens with different initial density, their failure stresses increases with the increment of initial density, but failure strain does not present any obvious regular patterns. Therefore, for metal foam with highly complicated meso-structure heterogeneity, it is not enough to describe their material characteristics only using initial density. Image analysis of the foam aluminum tensile failure characteristics shows that the material failure is caused by the meso- structure's failure appeared at the tensile later stage, which indicates that the nonlinearity at the early tensile stage is mainly caused by the yield of matrix material induced due to the serious heterogeneous meso-structure. |
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