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Interfacial Failure in Stitched Foam Sandwich Composites.
Yue Hu1, Jun Zhu2, Jihui Wang1
1School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430063, China.
Materials (Basel, Switzerland)
|April 30, 2021
Summary
This study demonstrates how automatic stitching improves composite interfaces. An 8 mm stitch spacing in glass fiber reinforced plastics (GFRP) composites enhances fracture toughness and alters crack propagation.
Area of Science:
- Materials Science
- Composite Materials Engineering
- Fracture Mechanics
Background:
- Composite materials, particularly foam sandwich composites, are susceptible to interfacial delamination.
- Improving the interlaminar fracture toughness of composites is crucial for structural integrity.
- Automatic stitching offers a potential method for enhancing composite performance.
Purpose of the Study:
- To investigate the effect of automatic stitching on the interfacial properties of glass fiber reinforced plastics (GFRP)/foam sandwich composites.
- To analyze the influence of different stitching spacings on crack propagation and fracture behavior.
- To determine the optimal stitching spacing for enhanced mechanical performance.
Main Methods:
- Demonstration of a customized automatic reinforcement stitching equipment.
- Fabrication of GFRP/foam sandwich composite preforms with varying stitch spacings.
- Mode-I Cracked Sandwich Beam (CSB) fracture tests to evaluate interfacial properties.
- Analysis of load-displacement curves, crack propagation, and critical strain energy release rates.
Main Results:
- Stitching treatment significantly increased peak load and fracture displacement.
- Crack propagation mechanisms were altered by the stitching process.
- An 8 mm stitch spacing demonstrated the most effective enhancement in fracture toughness, with a linearly distributed critical strain energy release rate.
Conclusions:
- Automatic stitching is an effective method for improving the interfacial properties of GFRP/foam sandwich composites.
- Stitching alters crack propagation mechanisms, leading to enhanced fracture resistance.
- An 8 mm stitch spacing represents the optimal parameter for toughening these composite structures.
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