UD Ballistic Composite Bonding for Low Backface Signature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ballistic resistant composites face challenges in achieving both superior V50 ballistic performance and low backface signature due to insufficient adhesion of polymeric binder materials, leading to fiber delamination and reduced composite structural properties.
Innovation Solution
Processing fibers to remove a portion of the fiber surface finish, allowing direct contact between the polymer and fiber surface, and applying bond-enhancing treatments to improve interlaminar lap shear strength and fiber-coating adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fiber surface finish is present to facilitate processing, then ease of manufacture is improved, but adhesion of polymeric binder materials deteriorates
Solution Approach 1:
The fiber surface finish is removed before the polymeric binder material is applied, preparing the fiber surface in advance to ensure optimal adhesion. This preliminary action eliminates the barrier that would otherwise prevent direct contact between the binder and fiber, resolving the contradiction between ease of manufacture and adhesion strength.
Solution Approach 2:
The fiber surface finish is extracted or removed from the fiber surface before binder application. This extraction eliminates the interfering layer that prevents effective adhesion, allowing the polymeric binder to directly contact and bond with the fiber surface, thereby resolving the contradiction between manufacturing ease and bond strength.
2Reliability
If fiber surface finish is present to reduce static build-up, then reliability of processing is improved, but fiber-binder bond strength deteriorates
Solution Approach 1:
The fiber surface finish is removed in advance before binder application, ensuring the fiber surface is properly prepared for optimal bonding. This preliminary removal action prevents the finish from interfering with adhesion while maintaining processing reliability through controlled removal methods.
Solution Approach 2:
The fiber surface finish is extracted from the fiber surface to eliminate the barrier preventing direct binder-fiber contact. This extraction resolves the contradiction by removing the static-reducing finish that simultaneously prevents effective bonding, allowing the binder to directly adhere to the fiber surface.
3Ease of manufacture
If polymeric binder material adhesion is insufficient, then ease of application is improved, but composite structural properties deteriorate
Solution Approach 1:
The fiber surface is preliminarily prepared by removing the surface finish before binder application, ensuring optimal adhesion conditions. This preliminary action facilitates easy binder application while simultaneously ensuring strong fiber-binder bonding, resolving the contradiction between ease of application and structural properties.
Solution Approach 2:
The fiber surface finish is extracted to eliminate the barrier preventing effective binder adhesion. This extraction allows the polymeric binder to directly contact and bond with the fiber surface, resolving the contradiction between ease of application and composite structural integrity by removing the interfering layer.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach results in fibrous composites with increased interlaminar lap shear strength and reduced backface signature, enhancing the composite's ability to dissipate projectile impact energy and maintain structural integrity.
Implementation Method 1
said polymeric material is predominantly in direct contact with the fiber surfaces
Data Source
AI summary
Fabrication of ballistic resistant fibrous composites having improved ballistic resistance properties. More particularly, ballistic resistant fibrous composites having high interlaminar lap shear strength between component fiber plies or fiber layers, which correlates to low composite backface signature. The high lap shear strength, low backface signature composites are useful for the production of hard armor articles, including helmet armor.