Advancing in the process of extending the use of composites for structural parts applications, it is inevitable to work on complex shapes. That is the main reason why understanding the complex forming mechanisms and the factors put into play during the process of composite materials is a major interest for both pre-impregnated forming and dry fabric preforming. Thus, the appearance of defects is a major concern and predicting their appearance for optimal product quality is the priority. A great number of authors showed that defects degrade the overall performance of the composite by creating local heterogeneities. Many factors can initiate these defects. This article is an assembly of the development of the literature on this subject. It is an attempt to provide a description for each defect and a classification order following the scale, the behavior mechanisms, the appearance plan. This will help to converge toward an identification of the defects manifesting during the composite forming.

在将复合材料用于结构件应用的过程中推进，不可避免地要处理复杂的形状。这就是为什么了解复杂的成型机制和复合材料过程中发挥作用的因素是预浸渍成型和干织物预成型的主要兴趣的主要原因。因此，缺陷的出现是一个主要问题，预测它们的出现以实现最佳产品质量是当务之急。许多作者表明，缺陷会通过产生局部异质性来降低复合材料的整体性能。许多因素可以引发这些缺陷。这篇文章是关于这个主题的文献发展的集合。它试图为每个缺陷提供描述，并按照比例进行分类，行为机制，外观计划。这将有助于确定复合材料成形过程中出现的缺陷。