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该文在深入分析闭孔泡沫金属CT扫描图像的基础上,根据其细观结构特点,提出了泡沫金属三维细观模型建模方法。首先,根据闭孔泡沫金属胞孔形状和尺寸分布特性,提出了采用随机椭球体模拟胞孔的建模方法,通过采用随机投放算法,建立了三维胞孔随机投放模型;其次,提出了有限元网格剖分算法,通过引入材料属性识别算法,建立了泡沫金属三维有限元细观模型。在此基础上,研究了冲击荷载下泡沫金属的力学性能,分析了细观损伤破坏机理和能量吸收特性。结果表明,该文建立的三维细观模型,能够较好地反映泡沫金属材料的力学性能和细观损伤破坏机理。
Based on the in-depth analysis of closed-cell foam metal CT scanning images, a three-dimensional modeling model of foam metal was proposed based on its meso-structure characteristics. First of all, according to the shape and size distribution characteristics of closed-cell foam metal cells, a modeling method using random ellipsoid to simulate the cell hole is proposed. By using random placement algorithm, a three-dimensional random cell placement model is established. Secondly, Mesh segmentation algorithm, through the introduction of material attribute recognition algorithm, established a three-dimensional finite element model of the metal foam. On this basis, the mechanical properties of foam metal under impact load were studied, and the damage mechanism and energy absorption characteristics of mesoscopic damage were analyzed. The results show that the three-dimensional model established in this paper can well reflect the mechanical properties of foam metal materials and damage mechanism of mesoscopic damage.