Prediction of composite elastic modulus and polymerization shrinkage by computational micromechanics.
Prediction of composite elastic modulus and polymerization shrinkage by computational micromechanics.
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DOI：
10.1016/j.dental.2003.11.003
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发表时间：
2004-05
期刊：
影响因子：
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通讯作者：
R. Sakaguchi;B. D. Wiltbank;C. F. Murchison
中科院分区：
文献类型：
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作者：
R. Sakaguchi;B. D. Wiltbank;C. F. Murchison
目的采用广义单元法（GMC）细观力学模型模拟光活化聚合物基复合材料的弹性模量和聚合收缩。检验了两个假设：（1）细观力学模型提供的弹性模量对填料分数的估计比混合物规则、Hashin-Shtrikman和唯象模型具有更高的精度;（2）细观力学分析程序/广义细胞法准确地模拟了聚合收缩应变的实验基准。MethodsThe study applied mathematical algorithms to a representative volume element of a model polymer composite to yield value estimates of弹性模量和收缩应变。复合材料组分的机械性能来自BisGMA和TEGDMA填充和未填充树脂的热机械和动态力学分析。从微观力学模型的数据进行了比较，结果的其他分析方法以及实验benchmarks.ResultsPredictions的弹性模量与填料分数的微观力学模型提供了更大的准确性比规则的混合物和Hashin-Shtrikman模型。聚合收缩应变的预测值在13%以内的实验value.SignificanceThe弹性微观力学模型提出了准确预测的弹性模量和聚合收缩应变作为填料分数的函数，上级其他分析方法。
ObjectivesThe objective of this study was to simulate the elastic modulus and polymerization shrinkage of a light activated polymer matrix composite using a generalized method of cells (GMC) micromechanics model. Two hypotheses were tested: (1) the micromechanics model provides estimates of elastic modulus vs filler fraction with greater accuracy than the rule of mixtures, Hashin-Shtrikman and phenomenological models; (2) Micromechanics Analysis Code/Generalized Method of Cells accurately simulates experimental benchmarks of polymerization shrinkage strain.MethodsThe study applied mathematical algorithms to a representative volume element of a model polymer composite to yield value estimates of the elastic modulus and contraction strain. Mechanical properties of the composite constituents were derived from thermomechanical and dynamic mechanical analysis of BisGMA and TEGDMA filled and unfilled resins. Data from the micromechanics model were compared to results of other analytical methods as well as experimental benchmarks.ResultsPredictions of elastic modulus vs filler fraction from the micromechanics model provided greater accuracy than the rule of mixtures and the Hashin-Shtrikman models. Predictions of polymerization shrinkage strain were within 13% of experimental values.SignificanceThe elastic micromechanics model presented accurately predicted elastic modulus and polymerization shrinkage strain as a function of filler fraction, superior to other analytical methods.