The description of the fiber bed compaction behavior is essential for the simulation of many composite manufacturing processes. In this study, we propose a material model describing the time-dependent compaction behavior of a dry fiber bed, valid for different fiber volume fractions and strain-rates. The approach is based on a linear generalized Maxwell model, in which stiffness parameters depend on strains, and relaxation times depend on strain-rates. The model parameters and functions are derived following an empirical approach, performing a curve fitting on multiple steps compaction experiments. The material considered is a carbon fiber woven fabric. The model response shows good agreement with the experimental results, proving the validity of the approach. The proposed material model uses only one set of equations to represent both the compaction and relaxation phases and can be easily implemented in numerical simulation tools.

纤维床压实行为的描述对于许多复合材料制造过程的仿真至关重要。在这项研究中，我们提出了一种描述干纤维床随时间变化的压实行为的材料模型，该模型对不同的纤维体积分数和应变率有效。该方法基于线性广义麦克斯韦模型，其中刚度参数取决于应变，松弛时间取决于应变率。模型参数和函数是根据经验方法得出的，对多步压实实验进行了曲线拟合。所考虑的材料是碳纤维机织织物。模型响应与实验结果吻合良好，证明了该方法的有效性。