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Research on Bending Performance of Three-Dimensional Deep Angle Interlock Kevlar/EP Armor Material
Jianhua Zheng1,2, Lin Zhong1, Hongxia Chen1
1School of Textile and Clothing, Nantong University, Nantong 226007, China.
Materials (Basel, Switzerland)
|August 12, 2022
Summary
This study investigates three-dimensional deep-angle-interlock (3DDAI) Kevlar/EP armor, finding orthogonal layering enhances fracture energy by 20% and improves bending performance and delamination resistance compared to 2D laminates.
Area of Science:
- Materials Science
- Composite Materials
- Protective Armor Technology
Background:
- Three-dimensional (3D) woven composites offer high specific strength and impact resistance, making them promising for lightweight protective armor.
- Existing research has gaps regarding the performance and influencing factors of three-dimensional deep-angle-interlock (3DDAI) Kevlar/EP armor materials.
- Optimizing 3DDAI Kevlar/EP armor requires understanding factors affecting its mechanical and ballistic properties.
Purpose of the Study:
- To investigate the bending performance of 3DDAI Kevlar/EP armor materials.
- To analyze the influence of stacking layers, resin content, laying method, and weft density on material properties.
- To compare the performance of 3DDAI Kevlar/EP armor with traditional two-dimensional (2D) plain laminated Kevlar/EP armor.
Main Methods:
- Fabrication and mechanical testing of 3DDAI Kevlar/EP armor materials.
- Systematic variation of parameters: number of stacking layers, resin content, laying method (orthogonal vs. unidirectional), and weft density.
- Comparative analysis against 2D plain laminated Kevlar/EP armor under bending load.
Main Results:
- The number of stacking layers significantly impacts initial stiffness (upper layers) and fracture strength (bottom layers) under bending.
- Disparities in warp and weft density negatively affect yarn utilization and overall material strength.
- Orthogonal laying method yielded approximately 20% higher fracture energy compared to unidirectional layering.
- 3DDAI Kevlar/EP armor exhibited superior bending performance in the weft direction and enhanced delamination resistance over 2D counterparts.
Conclusions:
- Material properties of 3DDAI Kevlar/EP armor are sensitive to structural parameters like layer stacking and yarn density.
- The orthogonal laying method is advantageous for improving fracture energy and overall mechanical performance.
- 3DDAI Kevlar/EP composites demonstrate superior delamination resistance and bending performance, positioning them for advanced armor applications.
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