Influence of embedded gap and overlap fiber placement defects on the microstructure and shear and compression properties of carbon-epoxy laminates

详细信息    查看全文

• 作者：Marine Lan^a ; Denis Carti&eacute ; ^b ; Peter Davies^c ; ^{peter.davies@ifremer.fr" class="auth_mail" title="E-mail the corresponding author} ; Christophe Baley^a
• 关键词：Structural composites ; B. Defects ; B. Mechanical properties ; D. Mechanical testing
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：82
• 期：Complete
• 页码：198-207
• 全文大小：4209 K

文摘

This paper presents results from an experimental study of the influence of embedded defects created during automated fiber tape placement, on the mechanical properties of carbon/epoxy composites. Two stacking sequences have been examined, [(−45°/+45°)₃/−45°] and [90°₄/0°₃/90°₄], in which gaps and overlaps have been introduced during fiber placement. These materials have been cured in an autoclave either with or without a caul plate, then analyzed by ultrasonic C-scan. The microstructures were characterized by scanning electron microscopy. In-plane shear tests were performed on the ±45° laminates and showed that the use of a caul plate does not affect mechanical behavior of plies in the embedded defect region. Compression tests were performed on 0°/90° laminates and in this case the presence of a caul plate is critical during polymerization as it prevents thickness variations and allows defects to heal.