国防科技大学学报2016，Vol.38Issue(4)：174-178,5.DOI:10.11887/j.cn.201604027
金属泡沫断裂韧性的试验研究
Experimental investigation on fracture toughness of metal foam
摘要
Abstract
In practical applications,fracture properties and fracture toughness of porous metal foam for bearing are very important.Based on ASTMstandards,three-point bending of aluminum foam samples was used to determine I type fracture toughness.It is shown that the fracture of metal foam is brittle fracture.The deformation is localized in the thinnest regions of the cell walls surrounding the crack tip.With further loading, some cell walls existed fracture phenomenon and microcracks appear in the vicinity of the crack tip.With the increasing of load a main crack is initiated at the notch root or at the pre-crack by a coalescence of microcracks,and starts to propagate through the cell structure.The crack follows the weakest path through the structure and creates the secondary cracks and crack bridges.The main way of crack extension is I type fracture. According to the P -V curve characteristics,taking the force and displacement of the maximum load point to calculate the critical crack tip opening displacement,the average crack-tip opening displacement is 0.051mm.关键词
金属泡沫/断裂韧性/三点弯曲/裂纹尖端张开位移Key words
metal foam/fracture toughness/three-point bending/crack-tip opening displacement分类
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王新筑,周雄,朱炳杰,彭向和..金属泡沫断裂韧性的试验研究[J].国防科技大学学报,2016,38(4):174-178,5.基金项目
汽车仿真与控制国家重点实验室开放基金资助项目（20121110）；汽车车身先进设计制造国家重点实验室开放基金资助项目（31315010）；中央高校基本科研业务费资助项目（CDJZR14325501）；中国博士后基金面上资助项目 （）
