一种模拟复合材料结构制造过程中因夹持空气和挥发物逸出而导致孔隙度的数值和实验方法

Curtis Hickmott, A. Forghani, Victoria Hutten, Evan Lorbiecki, F. Palmieri, B. Grimsley, B. Coxon, G. Fernlund, A. Poursartip
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引用次数: 0

摘要

高性能复合材料结构对可接受的孔隙率有严格的要求。这对机械性能的影响是显著的,考虑到问题的复杂性,减少空隙的增长可能是一个挑战。孔隙度的演化可以概括为源和汇之间的平衡,源和汇决定空隙的生长或收缩。空隙增长的主要来源包括袋泄漏、系统中夹持的空气、挥发性物质的逸出和固化收缩。减少孔隙度的机制包括从系统中去除空气,并在过程中保持足够的树脂压力,以保持溶液中的挥发物。本文提出了一种模拟由于夹持空气和挥发物引起的空隙演化的方法。先前的实验研究表明,局部树脂压力的降低与孔隙形成的可能性增加有关。将研究结果与测量局部树脂压力的实验进行了比较,并采用了板的显微照片来表征孔隙率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Numerical and Experimental Approach for Modeling Porosity Due to Entrapped Air and Volatiles Off-gassing During Manufacturing of Composite Structures
High performance composite structures have strict requirements regarding acceptable levels of porosity. The impact can be significant on mechanical performance and mitigating the growth of voids can be a challenge given the complexity of the problem. The evolution of porosity can be summarized as a balance between sources and sinks which determine void growth or shrinkage. The primary sources of void growth include bag leaks, entrapped air in the system, off-gassing of volatiles, and cure shrinkage. Mechanisms which mitigate porosity include removal of air from the system and maintaining sufficient resin pressure during the process to keep volatiles in solution. In this paper, an approach for modeling the evolution of voids due to entrapped air and volatiles is presented. It has been shown in previous experimental studies that decreases in local resin pressure are linked to a higher likelihood of porosity formation. Results of the study are compared to experiments in which the local resin pressure was measured and micrographs of the panels were taken to characterize the porosity.
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