Injection-molded short-fiber-reinforced thermoplastics are widely used in today’s industry. Nevertheless, their mechanical behavior is difficult to model, especially because of strong anisotropy induced by complex fiber distributions of orientation. Moreover, the intrinsic variability of plant fibers’ properties leads to an even more complex behavior than with mineral fibers and therefore increase the uncertainty for behavior prediction of these materials. The aim of this review is to provide basic and more specific knowledge about dealing with the uncertainty related to injection molded short-plant-fiber-reinforced thermoplastics behavior, focusing on variability induced by both injection-molded process and natural variability of plant fibers properties. To achieve this goal, it is important to understand the behavior of SFRT before considering the uncertainty induced by the use of natural fibers. Thus, in the first place, the authors have chosen to limit the sources of uncertainty related to fibers by studying the case of a short-glass-fibers-reinforced thermoplastic. Then, after discussing the sources of uncertainty related to the use of natural fibers, the methods for the quantification, the propagation and the management of uncertainties are analyzed.

注塑成型的短纤维增强热塑性塑料在当今工业中得到广泛应用。然而，它们的机械行为很难建模，特别是由于复杂的纤维取向分布引起的强烈各向异性。此外，植物纤维特性的内在可变性导致比矿物纤维更复杂的行为，因此增加了这些材料行为预测的不确定性。本综述的目的是提供有关处理与注射成型短植物纤维增强热塑性塑料行为相关的不确定性的基本和更具体的知识，重点是注射成型过程和植物纤维特性的自然变化引起的变化。为了实现这一目标，在考虑使用天然纤维引起的不确定性之前，了解 SFRT 的行为很重要。因此，首先，作者选择通过研究短玻璃纤维增​​强热塑性塑料的案例来限制与纤维相关的不确定性来源。然后，在讨论了与天然纤维使用相关的不确定性来源之后，分析了不确定性的量化、传播和管理方法。