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<p>Composite materials are highly susceptible to damage and defects introduced during machining or manufacturing processes, making them particularly vulnerable to processing-induced anomalies. Their consumption and production are gradually increasing due to high market demand in the aerospace, automotive and medical device industries. This study investigates the critical aspect of delamination in composite laminates, which are manufactured through a series of manufacturing processes. Delamination patterns vary with types of manufacturing processes, which are vital to examine to ensure that the desired properties are achieved. In this research study, the dependence of delamination on fiber orientation and ply stacking sequence is evaluated, as these factors significantly influence the delamination and strength of composite materials. Specimens of 30&#xa0;mm by 70&#xa0;mm size are produced via vacuum infusion molding and cured at room temperature. The specimens are drilled with five different diameter holes (2–6&#xa0;mm) and are examined using a stereo microscope. The delamination of layers is evaluated using ImageJ software and the outcome is analyzed through the Analysis of Variance (ANOVA) technique. The results showed that the delamination envelope decreases with an increase in drill bit diameters, indicating a reduced tendency of getting delamination at larger drill bit sizes. The 5&#xa0;mm drill bit showed a least delamination factor on classified laminates. The minimum delamination is 1.159 and the maximum delamination is 2.289, both were observed on 2&#xa0;mm drill bit. The findings indicated that increasing the number of stacking plies increase the probability of delamination, influenced by fiber orientation. Conversely, increasing the angle of the fiber orientation reduces the probability of delamination, influenced by ply count.</p>

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Impact of fiber orientation and stacking sequence on the severity of drilling induced delamination in carbon fiber reinforced polymer (CFRP) laminates

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Muhammad Bilal,
  • Tariq Jamil,
  • Muhammad Wasif,
  • Inam Ul Ahad

摘要

Composite materials are highly susceptible to damage and defects introduced during machining or manufacturing processes, making them particularly vulnerable to processing-induced anomalies. Their consumption and production are gradually increasing due to high market demand in the aerospace, automotive and medical device industries. This study investigates the critical aspect of delamination in composite laminates, which are manufactured through a series of manufacturing processes. Delamination patterns vary with types of manufacturing processes, which are vital to examine to ensure that the desired properties are achieved. In this research study, the dependence of delamination on fiber orientation and ply stacking sequence is evaluated, as these factors significantly influence the delamination and strength of composite materials. Specimens of 30 mm by 70 mm size are produced via vacuum infusion molding and cured at room temperature. The specimens are drilled with five different diameter holes (2–6 mm) and are examined using a stereo microscope. The delamination of layers is evaluated using ImageJ software and the outcome is analyzed through the Analysis of Variance (ANOVA) technique. The results showed that the delamination envelope decreases with an increase in drill bit diameters, indicating a reduced tendency of getting delamination at larger drill bit sizes. The 5 mm drill bit showed a least delamination factor on classified laminates. The minimum delamination is 1.159 and the maximum delamination is 2.289, both were observed on 2 mm drill bit. The findings indicated that increasing the number of stacking plies increase the probability of delamination, influenced by fiber orientation. Conversely, increasing the angle of the fiber orientation reduces the probability of delamination, influenced by ply count.