| 非线性黏弹复合材料有效性质 |
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| 引用本文： | 李丹,胡更开.非线性黏弹复合材料有效性质[J].复合材料学报,2008,25(3):154-159. |
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| 作者姓名： | 李丹 胡更开 |
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| 作者单位： | 北京理工大学,理学院力学系,北京,100081 |
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| 摘 要： | 提出了一个细观力学模型 , 用于预测非线性黏弹聚合物基复合材料的有效性质。该方法利用广义割线模量方法对单积分型热力学本构进行线性化 , 并运用 Laplace变换技术将黏性问题转化为弹性问题。利用热力学本构拟合高密度聚乙烯的实验数据 , 得到基体的材料参数。 利用该模型计算了玻璃微珠填充高密度聚乙烯复合材料(GB/HDPE)在恒应变率下的应力应变关系 , 计算结果与文献实验结果吻合较好。数值计算结果表明 GB/HDPE复合材料表现出明显的非线性力学行为。 该细观力学模型可以很好地预测复合材料非线性黏弹性性质。
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| 关 键 词： | 细观力学 非线性 黏弹性 复合材料 有效性质 |
| 文章编号： | 1000-3851(2008)03-0154-06 |
| 收稿时间： | 2007-07-27 |
| 修稿时间： | 2007年7月27日 |
Effective behavior of nonl inear viscoelastic composites |
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| LI Dan,HU Gengkai.Effective behavior of nonl inear viscoelastic composites[J].Acta Materiae Compositae Sinica,2008,25(3):154-159. |
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| Authors: | LI Dan HU Gengkai |
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| Affiliation: | (Department of Applied Mechanics| Beijing Institute of Technology| Beijing 100081| China) |
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| Abstract: | A micromechanical model was proposed to estimate the overall nonlinear viscoelastic behavior for the
particulate polymer composites. The method was based on the generalized secant method and Laplace t ransform technique. Schapery thermodynamics constitutive law was used to simulate the experimental data of high2 density polythene ( HDPE) mat rix and the material functions were identified. The st ress and st rain relation at a constant st rain rate for HDPE2mat rix composite filled with glass beads was analyzed. The predicted result s agree well with the experimental ones. The result s show that the GB/ HDPE composites present obvious nonlinear behavior . The model can well predict the nonlinear viscoelastic properties for polymer composites. |
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| Keywords: | micromechanics nonlinearity viscoelasticity composites effective property |
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