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Testing Kevlar Material and Stab-Proof Vests
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Testing Kevlar Material and Stab-Proof Vests
Testing Kevlar Material and Stab-Proof Vests
Solution
- Twin-column, software-controlled tensile/compression test system.
- Load cells were selected to match the required test forces.
- Adjustable upper grip to hold a range of blade- or spike-like implements.
- Lower fixture table designed to support vest samples securely.
Benefits
- Flexible software environment to calculate key performance parameters.
- Large test space accommodating a variety of vest sizes and designs.
- Reliable, repeatable testing to provide confidence in wearer protection.
Law enforcement agencies have been successfully using the Presto Stantest tensile and compression testing system to properly determine penetration resistance and protective qualities of stabproof vests. With the specialized zeus ultimo 3.0 tensile and compression tester for knives and improvised stabbing tools, different parts of the vest can be tested in a controlled environment to test the stabbing resistance of the vest's chest, shoulders, sides, and back. This force-controlled setup captures the data, such as absorbed energy and maximum penetration force, providing definite data for comparing new and used protective vests. Repeatable testing with different types of blinds holds the lower fixture securely and ensures the operator's safety, thanks to adjustable grips. The large test area allows for multiple vest designs and sizes to be tested, which enables agencies to determine protection in real-world scenarios, monitor performance of the vests over time, and ensure that vests used for personal protective equipment are safe and durable.
Requirement
Kevlar is one of the strongest materials depending on the thckness of their element or materials available and is used in protective gloves, tires, and even bulletproof vests. The material's strength-to-weight ratio makes it the material of choice for stab-proof vests that combine Kevlar inserts with external layers of softer material for comfort.
These need to withstand stabbings from knives, spikes, and other sharp, pointed items while allowing easy movement. A leading law enforcement agency required comparative testing of new and used vests to measure penetration resistance across different areas, including shoulders, chest, sides, and back, using real-world knives and improvised weapons.
Solution
The protective performance of Kevlar arises from its tightly woven fibers. Under a stabbing impact, the weave absorbs energy and slows the entry of a sharp object.
Pointed weapons may separate fibers locally, while broader blades can be caught in the weave, reducing the likelihood of complete puncture.
Presto Stantest supplied a zeus ultimo 3.0 twin-column tensile tester fitted with a special upper fixture to hold a variety of knife blades and improvised stabbing implements. A lower penetration jig securely positions vest specimens, allowing the blade to pass through safely. Software controlled the test zeus ultimo 3.0 machine test, applying compressive forces while recording maximum penetration force in newtons and the energy absorbed in joules, providing critical comparative performance data.
Test equipment
- The Zeus ultimo 3.0 is a twin-column, software-controlled tensile/compression test system.
- 10 kN cell
- Adjustable upper grip for knives and improvised stabbing tools.
- Lower support fixture with an aperture to allow complete penetration.
Test standards
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