基于DEFORM的泡沫铝的压缩性能数值模拟研究（毕业学术论文设计）.doc

泡沫铝的压缩变形行为及力学性能的研究 PAGE 2 金属泡沫材料作为一种功能性轻质结构材料，具有良好的力学、声学和热学性能，在国民经济和国防建设等诸多领域有着广泛的应用前景。 本文通过DEFORM软件对泡沫铝的压缩性能进行了数值模拟研究，并根据模拟结果观察不同条件下的模拟曲线图，分析了孔隙率、材质、试样尺寸等因素对泡沫铝压缩性能的影响。结论如下： (1)泡沫铝在准静态压缩过程中，变形过程与材质、孔隙率，尺寸大小有关。 (2)材质对泡沫铝的影响最大，AlSi泡沫比纯铝泡沫的屈服强度、平台应力都大，而且平台区越长，吸能效果更好； (3)孔隙率对泡沫铝的影响较大，孔隙率越高，屈服强度相对越低； (4)尺寸大小对泡沫铝的影响最小，尺寸越大，平台应力越大。 关键词：泡沫铝；DEFORM软件；数值模拟 Numerical Simulation Calculation of Mechanical Properties for Metal Foam Abstract As a light weight structural and functional material, metallic foams have shown promising applications in a number of engineering fields. Being used as a protective material is one of most important applications due to their higher energy absorption capacity. Aa a result, using the finite element HYPERLINK /software/ \t _blank software-DEFORM, the porous foam compressing process were studied by numerical simulation. The deformation characteristics curves were derived under HYPERLINK /different/ \t _blank different loading HYPERLINK /condition/ \t _blank conditions. Then ,the infect of porosity, material, the sample size on compression properties of aluminum foam. And the results are showed as follows: (1)Aluminum foam compression in quasi-static compression process, the result showed that the deformation process correlated with the material, porosity and pore size. (2)The material has the most influence on compression property, yielding stress of Al-Si foam is higher than pure Al foam’. It got the higher yield strength, the longer plateau region and the wider plateau width, so the effect of energy absorption were better; (3) Next, porosity has the influence on compression property, the higher porosity, relatively a lower yield strength; (4) The sample dimension effects is the lowest, the stress of bigger speciments is higher than the smaller’. Keywords: Aluminum foams；DEFORM- software；Numerical Simulation 目 录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc232906501 第一章 绪论 PAGEREF _Toc232906501 \h - 1 - HYPERLINK \l _Toc232906502 1.1