纤维复合材料中孔隙的起因评述

文中介绍美国麦道宇航公司对纤维复合材料中产生孔隙原因的评述。热固性树脂基复合材料固化成型过程中产生孔隙的最简单机理是与挥发物的蒸气压相关联的。如果树脂凝胶前挥发物的蒸气压力超过树脂流体的压力,则会在层板中生成孔隙,而且孔会长大。介绍了影响树脂流体压力的试验结果,并讨论了诸如树脂体系化学组成,树脂体系的配置和预浸操作、铺层、加压以及固化工艺等因素对孔隙形成、长大的影响。

AN OVERVIEW OF CAUSES ON POROSITY IN FIBER COMPOSITES

This paper introduces an overview of causes on porosity in fiber composites described by McDonnell Douglas Aerospace.A simple theory for void formation in the thermoset composite materials is presented to volatile vapor pressure. If the volatile vapor pressure in the curing laminate exceeds the actual pressure on the liquid resin prior to gelation, then void formation and growth will occur. Expermental results are presented that show the effects on the measured hydrostatic resin pressure. This is followed by a discussion of the variables that are known to influence void formation and growth, specifically, chemical composition of the resin system, resin mixing and prepreging operations, layup variable, pressure operations, tooling variables, and finally cure cycle variables.