Rigid structural and low back face signature ballistic UD/articles and method of making
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Solution Overview
Problem
Ballistic resistant composites face challenges in achieving superior V50 ballistic performance while maintaining low backface signature, as existing fiber surface finishes interfere with polymeric binder adhesion, leading to reduced fiber-fiber bond strength and increased delamination during projectile impacts.
Innovation Solution
Processing fibers to remove a portion of the surface finish, allowing direct contact between the fiber surface and the polymeric binder, thereby enhancing fiber-fiber bonding and improving the dynamic storage modulus of the composite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fiber surface finish is applied to reduce static build-up and facilitate processing, then ease of manufacture is improved, but fiber-binder adhesion deteriorates
Solution Approach 1:
The fiber surface finish is removed before the polymeric binder is applied to the fibers. This preliminary removal action ensures that the binder can directly contact and adhere to the fiber surface, eliminating the adhesion barrier that the finish would create. The process sequence is specifically designed to perform the removal operation at the appropriate stage before binder application.
Solution Approach 2:
The fiber surface finish is extracted or removed from the fiber surface through processing methods such as washing or chemical treatment. This extraction eliminates the harmful layer that prevents binder adhesion, allowing the polymeric binder to directly contact and bond with the fiber surface, thereby resolving the adhesion problem while maintaining the benefits of reduced static build-up.
2Ease of operation
If fiber surface finish is present on fibers, then static build-up is reduced, but fiber-fiber bond strength deteriorates
Solution Approach 1:
The fiber surface finish is removed before the fibers are consolidated into the composite structure. This preliminary removal ensures that when the fibers are subsequently bonded together, there is direct contact between fiber surfaces, maximizing fiber-fiber bond strength. The timing of the removal operation is critical to achieving both static control and strong bonding.
Solution Approach 2:
The fiber surface is modified locally by removing the finish only in the regions where bonding is required, while potentially maintaining other surface properties elsewhere. This localized modification allows the fiber to exhibit different properties at different locations: direct bonding capability where surfaces contact, and retained static control properties in other areas.
3Ease of manufacture
If polymeric binder is applied over fiber surface finish, then fiber processing is facilitated, but binder delamination during impact increases
Solution Approach 1:
The fiber surface finish is removed before the polymeric binder is applied to the fibers. This preliminary removal action ensures that the binder can directly contact and adhere to the fiber surface, eliminating the adhesion barrier that the finish would create. The process sequence is specifically designed to perform the removal operation at the appropriate stage before binder application.
Solution Approach 2:
The fiber surface finish is extracted or removed from the fiber surface through processing methods such as washing or chemical treatment. This extraction eliminates the harmful layer that prevents binder adhesion, allowing the polymeric binder to directly contact and bond with the fiber surface, thereby resolving the adhesion problem while maintaining the benefits of reduced static build-up.
4Device complexity
If fiber surface finish interferes with binder adhesion, then manufacturing complexity is reduced, but ballistic resistance deteriorates
Solution Approach 1:
The fiber surface finish is removed before the polymeric binder is applied to the fibers. This preliminary removal action ensures that the binder can directly contact and adhere to the fiber surface, eliminating the adhesion barrier that the finish would create. The process sequence is specifically designed to perform the removal operation at the appropriate stage before binder application.
Solution Approach 2:
The fiber surface finish is extracted or removed from the fiber surface through processing methods such as washing or chemical treatment. This extraction eliminates the harmful layer that prevents binder adhesion, allowing the polymeric binder to directly contact and bond with the fiber surface, thereby resolving the adhesion problem while maintaining the benefits of reduced static build-up.
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 improved composite structural properties and reduced backface deformation by increasing the dynamic storage modulus and enhancing the energy dissipation of projectile impacts, leading to superior ballistic resistance and lower backface signature.
Implementation Method 1
allowing direct contact between the fiber surface and the polymeric binder, thereby enhancing fiber-fiber bonding
Implementation Method 2
enhancing the energy dissipation of projectile impacts, leading to superior ballistic resistance and lower backface signature
Data Source
AI summary
Fabrication of ballistic resistant fibrous composites having improved ballistic resistance properties. More particularly, ballistic resistant fibrous composites having enhanced a dynamic storage modulus, which correlates to low composite backface signature.