【摘要】 在对发泡过程进行假设的基础上,根据泡沫材料微结构的特点,建立开孔和闭孔泡沫材料的简单立方、面心立方和体心立方单胞模型,导出相对密度和胞体结构参数的定量关系。由这三类单胞模型描述的泡沫材料均具有周期性的特点,且单胞还具有结构对称性。文中利用有限元方法,在适当的边界条件下计算整个密度范围内泡沫材料的弹性模量和泊松比,数值拟合模量计算公式。通过与已有的实验资料和理论预测结果的比较,说明有限元数值计算的有效性。更多还原

【Abstract】 Based on the assumptions of the foaming process and the microstructure characteristics of foam,open-cell and closed-cell models with single-centered cubic(SCC),face-centered cubic(FCC) and body-centered cubic(BCC) array are constructed.The relationships between relative density and structural parameters of cells are obtained from these models.Foams with these three kind cells are periodic and their cells are also all symmetrical.The elastic modulus and Poisson’s ratio in the whole density range are calculated with finite element method under appropriate boundary conditions.And the formulation of elastic modulus is fitted numerically.Comparing with previous theoretical results and experimental data,the validity of finite element analysis is confirmed.更多还原