聚氨酯硬质泡沫材料本构研究及其在夹芯板中的应用

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基金项目:

深圳市科技计划项目(2005-k3-5);深圳市南山区科技计划项目(06-3-15)

STUDY ON POLYURETHANE FOAM MATERIAL CONSTITUTIVE RELATION AND IT. S APPLICATION IN SANDWICH PANELS

1.
Civil Engineering of Shenzhen Graduate School,Harbin Institute of Technology,Shenzhen 510085

摘要: 为了研究聚氨酯硬质泡沫材料的应力-应变特性及泊松比,对聚氨酯硬质泡沫材料在室温下进行了加载速率为2 mm/min准静态拉伸、压缩、剪切试验。结果表明,聚氨酯聚氨酯硬质泡沫材料在抗压方面有良好的延性性能,而在抗拉、抗剪方面则表现为明显的脆性;泊松比则具有一定的离散性,一般约0.25左右;另外,基于其应力-应变关系曲线,对其本构关系进行拟和回归,并将其应用到金属夹芯板试验有限元模拟中来,结果表明:有限元模拟结果与试验结果有较好的吻合。
- 拉伸 /
- 压缩 /
- 剪切 /
- 应力 /
- 应变
Abstract: In order to investigate the stress-strain relationship and Poisson. s ratio of the polyurethane foam material, the quas-i static tensile, compression, and shear test was conducted at room temperature with the loading speed 2mmPmin and the results show that, the material has an excellent ductility behavior on compression, but on tension and shearing, it. s obviously brittle; the Poisson. s ratio is somewhat discrete, it. s about 0. 25. In addition, based on it. s stress-strain relationship curves, a simple fitting constitutive relation is given. By the constitutive relation a FEM model is got to simulate the experiment, and the results show the validity of the constitutive relation model.
- tension /
- compression /
- shearing /
- stress /
- strain