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Advanced Prediction and Analysis of Delamination Failure in Graphite-Reinforced Epoxy Composites Using VCCT-Based
Ahmed F Mohamed1, Mohammed Y Abdellah2,3, Mohamed K Hassan4
1Industrial Engineering Department, College of Engineering and Architecture, Umm Al-Qura University, P.O. Box 5555, Makkah 21955, Saudi Arabia.
Polymers
|April 28, 2025
Summary
This study accurately predicts delamination fracture energy in graphite composites using virtual crack closure technique (VCCT) and finite element analysis (FEM), validated by an analytical model with a 5% error margin.
Area of Science:
- Materials Science and Engineering
- Mechanical Engineering
- Composite Materials
Background:
- Graphite-reinforced composite laminates are crucial in various industries.
- Delamination, a critical failure mode, significantly impacts composite structure integrity.
- Understanding and predicting interlaminar fracture energy is essential for composite design.
Purpose of the Study:
- To predict mode I interlaminar fracture energy in graphite-reinforced composites.
- To develop and validate both numerical and analytical models for delamination analysis.
- To assess the accuracy of proposed methods against experimental data.
Main Methods:
- Utilized the virtual crack closure technique (VCCT) integrated with a finite element model (FEM).
- Applied the models to a double cantilever beam (DCB) specimen.
- Developed a straightforward analytical model based on material strength and stiffness.
Main Results:
- The finite element model (FEM) with virtual crack closure technique (VCCT) accurately predicted mode I interlaminar fracture energy.
- The analytical model provided a reliable calculation of critical fracture energy.
- Results showed strong agreement with experimental data, with a low margin of error (as low as 5%).
Conclusions:
- The proposed numerical and analytical methods are accurate and reliable for predicting delamination fracture energy in composite laminates.
- The study validates the effectiveness of VCCT and FEM for analyzing composite failure.
- Findings contribute to improved design and safety of graphite-reinforced composite structures.
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