Advanced composite polymer matrix and their different manufacturing processes tend to develop pores of varying size and play a major limiting role in residual stress, damage initiation, matrix cracking, strength, and durability. Direct imaging or simulations to understand the pore formation mechanism in the viscous polymer is difficult. Ultimately, the mechanical performance of the solidified matrix needs better prediction. This paper presents a stochastic micromechanical model, including the effect of pores' formation on the polymer matrix's elastic properties. Theoretical homogenization based micromechanical models for polymer composites is reviewed in the first part. Later, a micromechanical model is proposed considering the different stages of pore formation in a polymer matrix. Polymer samples are fabricated for determining the pore distribution parameters and used appropriately in the proposed model to estimate the elastic properties for a given distribution and volume fraction of the pores. A modified Mori‐Tanaka homogenization approach and a differential scheme of inclusion of pores are incorporated in the model. Results obtained from the proposed model are compared with the experimental measurements, and a significant correlation is found.

中文翻译：

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孔对聚合物基复合材料弹性性能的微力学影响

先进的复合聚合物基体及其不同的制造工艺往往会形成大小不一的孔，并在残余应力，损伤引发，基体开裂，强度和耐久性方面发挥主要的限制作用。直接成像或模拟以了解粘性聚合物中的孔形成机理是困难的。最终，固化基质的机械性能需要更好的预测。本文提出了一种随机的微力学模型，包括孔的形成对聚合物基体弹性性能的影响。在第一部分中，综述了基于理论均质化的聚合物复合材料微机械模型。后来，考虑到聚合物基质中孔隙形成的不同阶段，提出了一种微力学模型。制备聚合物样品以确定孔分布参数，并在建议的模型中适当使用聚合物样品以估算给定孔分布和体积分数的弹性性能。改进的Mori-Tanaka均质化方法和包含孔隙的微分方案已纳入模型。从建议的模型中获得的结果与实验测量值进行比较，并且发现了显着的相关性。