Bird Strike and Projectile Impact Testing
By Engaged Expert David Lichtman
Aerospace qualification - bird strike testing
Relentless testing of airplane materials and components is integral to ensure planes are safe and fit for purpose. Bird strike and hail impact testing ensure when an airplane collides with a bird, hail, or debris during flight, the contact should not disable or threaten the integrity of flight capability.
Bird Strike and projectile impact testing
When an airplane collides with a bird or debris during flight, the high velocities of contact can damage or disable engines, break windscreens, and threaten the structural integrity of an aircraft. While the majority of bird strikes will not affect an aircraft to be able to continue flying, the in-flight impact can pose a serious threat and have the potential to cause significant damage, or disabling the planes ability to fly.
Aircraft certification standards for the Federal Aviation Authority (FAA) and European Union Aviation Safety Agency (EASA) require impact testing of the engine and the airframe externals. Testing the effect of impact demonstrates the resistance of the product to bird impact and can cope with damage inflicted by birds of different weights while in flight.
How to perform bird strike testing
Standardized methods for testing bird impacts include using a pneumatic cannon. A bird (usually a chicken) of a specified weight) is launched at high velocity at the Unit Under Test from a specified distance. A post-test damage assessment is then performed per the specified criteria.
Today’s bird strike testing has advanced considerably since its inception, launching birds of varying weights (1.5 to 8lbs) at velocities of up to 450mph. Proximity sensors measure the real-time velocity of each shot, and high-speed video equipment monitors each impact for further analysis.
In addition to variations in speed and velocity of the projectile, there are other considerations and variables to consider when developing your test plan, including the projectile's weight, density, and rigidity, as well as the test specimens, surface shape, and angle of impact. Also, the kinetic energy absorbed by the airframe during the impact should be included during evaluation.
Hail impact testing
As well as bird strike impact testing, Element provides hail impact testing for the aerospace, automotive, and other industries. Hail impact testing entails launches hail, or simulated hail, from 0.5 inches diameter up to 2.75 inches diameter at the test specimen, and post-impact evaluation of the effect upon the product. Like bird strike testing, hail impact testing is vital for components in the design, development, and production stages, or requiring certification. Most commonly, hail testing is laboratory tested on aircraft exterior or inlet of the engine components, including windshields, radomes, antennas, and pitot tubes.
Projectile impact testing
Projectile impact testing helps to prepare for different types of projectile strikes that may occur when a plane is in operation. It is essential to determine, for example, if engine casing materials will be able to contain an engine fragmentation event, such as a fan blade break.
Under this testing process, aluminum, titanium, or other irregularly shaped objects are projected into at the test product at velocities of up to 550mph, to evaluate the effect of impact.
Test instrumentation for projectile impact testing can include high-speed photography, digital image correlation (deflection map), strain correlation, and thermal imaging.
Test design for bird strike and projective testing
Element is one of only a handful of facilities in the world that is capable of offering all three types of testing (bird strike, hail impact, and projectile impact) for a wide variety of materials, components, products, and systems.
Several important factors that can influence the testing process must be taken into full consideration:
- Test Fixture Design – including the angle of the unit under test, the rigidity of the fixture, target zone of impact, instrumentation access
- Sample Preparation – Uniformity of test items, attachment points of the sample test item to test fixture
- Definition of Data Requirements - options include Strain Gaging (stress measurement), High-Speed Photography (single or multiple cameras), and DIC (Digital Image Correlation) peak displacement map.
A well-designed test program will not only make it easier to complete testing but will support a product through its complete life cycle from the development phase to post-certification. Failures during a test might result in the identification of a design weakness, which could prove fatal if not identified and rectified. Benchmarking failures in a repeatable fashion allow for new designs and improving to successful testing, and a safer product.
Combining strike testing with aircraft qualification programs
A comprehensive test program incorporates testing to as many standards or requirements as possible and combining several complex elements into a single test plan.
As the largest independent provider of materials testing, product qualification testing, calibration, and advisory services to the global aerospace sector, Element can combine projectile strike testing with a unique range of more extensive testing and validation often required by aerospace manufacturers during qualification.
We commonly combine bird strike testing with direct & indirect lightning testing, High-Intensity Radiated Field (HIRF) testing, altitude testing, engineering simulation & finite element analysis, and explosive atmosphere testing.
With more than 3,000 technicians, engineers, and scientists dedicated to supporting our global aerospace customers, Element has the expertise and capacity to guide you through the complex nature of qualification testing of aerospace components.
Failing to meet critical deadlines such as safety of flight or late delivery can imply punitive measures and high costs. Ultimately, we deliver certainty in results, so you can create better and safer products, and minimize legal and financial risk.
To learn more about Element’s bird strike capabilities, please contact our experts today.
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