To reinforce the environmental standards, we need to strengthen the lightening of vehicles and to generalize new composite materials in order to reduce weight. To use these innovative composite materials in the mass production of automotive parts, it is essential to propose a predictive approach of the S-N curves, which must be established for each new composite formulation and for several types of microstructure within real components. Although these preliminary characterizations consume time and money, this paper proposes two hybrid methodologies to predict the fatigue life during the fatigue test. Both methodologies are based on micromechanical modeling which is developed under monotonous loading with fatigue effects under different amplitudes. The suggested methodology is based on an experimental analysis of monotonic behavior under fatigue loading and on multi-scale modeling of damage. In the results, the proposed model and the used approaches are in good agreement with the experimental results.

为了加强环境标准，我们需要减轻车辆的重量并推广新的复合材料以减轻重量。为了在汽车零件的批量生产中使用这些创新的复合材料，必须提出一种SN曲线的预测方法，必须针对每种新的复合配方以及实际部件中的几种类型的微结构建立SN曲线的预测方法。尽管这些初步表征会耗费时间和金钱，但本文还是提出了两种混合方法来预测疲劳测试期间的疲劳寿命。两种方法均基于微机械建模，该微机械建模是在单调载荷下开发的，并且在不同振幅下具有疲劳效果。建议的方法基于疲劳载荷下的单调行为的实验分析和损伤的多尺度建模。结果表明，所提出的模型和所采用的方法与实验结果吻合良好。