Hassan, Muhmimad Hafiz
(2014)
Effect Of The Bagging Configuration On The Properties Of Vacuum-Bagging-Only (Vbo) - Oven Cured In Complex-Shaped Composites.
Masters thesis, Perpustakaan Hamzah Sendut.
Abstract
With the growing needs of the aerospace industry to produce larger composite
components at reduced costs, Out-of-Autoclave (OOA) manufacturing technology is
perhaps the answer for the problem. However, the development work of the OOA process
using prepreg materials to achieve minimum void content without high external pressure
from the autoclave proved to be a major challenge. The research study focused
specifically on the vacuum bagging process. In the initial study, eight bagging
configurations which consist of three main processing parameters, including the use of
release film (PTFE) , edge breather and the intensifier were proposed to improve the
quality of the L-shaped laminate composites. The specimens were assessed based on
degree of uniformity (DOU) and void contents levels. The results were subsequently
evaluated using the analysis of variance (ANOYA) to determine the percentage of
influence of the processing parameters to the quality improvement. The experimental
results indicated that the use of PTFE has contributed 37.45% to the significant void
formation at the corner section. In contrast, the edge breather (YBO) and intensifier
successfully reduced the void content level by 19.64% and 29.41 %, respectively.
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