|
 The LM JSF team recently completed a successful pressure test of its “fastenerless” inlet duct design. The pressure test is a major step toward validating the use of integral composite attach flanges to eliminate thousands of through-the-duct fasteners. A combination of advanced composite material and process technologies contributes to the one-piece duct being fabricated cost effectively and assembled in the JSF airframe with minimal fasteners. Doing away with fasteners in the wall of the inlet produces a smooth inner surface that provides excellent aerodynamic and signature performance. It also eliminates maintenance needed to correct fastener corrosion and to repair fuel leaks.
“Compared to inlet ducts in today’s operational fighter aircraft, we estimate the new duct can be produced in half the span time and at two-thirds the cost,” said Frank J. Cappuccio, vice president and program manager of the Lockheed Martin JSF. “In addition, this duct features superior aerodynamics, radar cross-section, and durability and lower weight benefits. We have thus addressed all four pillars of the JSF program—affordability, lethality, survivability and supportability.”
The duct was to be tested up to and beyond its ultimate load-carrying capability to correlate predicted and actual stress levels and to confirm the expected failure mode. During the actual test, the duct resisted failure even at twice its ultimate design load, which approached the limits of the test fixture. The test was suspended at that point. A visual inspection of the duct showed no visible evidence of failure.
|
