Prediction for failure envelopes of composite laminates based on refined generalized method of cells
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摘要: 通用单胞模型常被应用于复合材料细观力学分析。但原始的通用单胞模型存在求解量大、计算效率低的问题。本文中对其改进, 建立了以子胞界面细观应力为未知量的细化单胞模型。该模型可以充分考虑纤维、基体和界面相等细观组分, 并实现单向板的宏-细观多尺度力学分析。通过将组分材料失效判据引入到模型中, 再与经典层合理论相结合, 提出了一种基于细化单胞模型的复合材料层合板强度预报方法, 并给出了基于试验数据的强度谱定量评测方法。通过与世界失效分析习题的失效理论和试验数据进行对比, 证明本文的预报方法具有很高的计算精度和广泛的普适性。Abstract: The generalized method of cells is often used in micromechanical analysis of composites. Large number of unknowns and lower computational efficiency are the shortcomings of original generalized method of cells. Here, the original method is improved by refined generalized method of cells of which unknowns are tractions of subcells in this paper. The micro-components such as fiber, matrix and interface can be modeled fully by the presented method. The macro-micro multi-scale mechanical analysis of unidirectional composite laminates can be achieved by the presented model. A prediction method combined the classical lamination theory and failure criteria of micro-components is presented. A quantitative assessment of failure envelopes is developed to evaluate the performance of failure criteria. The higher computational accuracy and universality have been demonstrated in comparison with other methods and experimental data provided by World-Wide Failure Exercise.
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Keywords:
- composites /
- failure envelopes /
- refined generalized method of cells /
- interface /
- multi-scale
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