What role smart materials play in construction of stealth aircrafts?

What role smart materials play in construction of stealth aircrafts?





please help


and can you find another use of smart materials?|||You will need to define what "smart" materials you are referring to. Stealth aircraft have numerous "smart" materials both on the skin and in the structure.|||Before designing the F-22 Raptor, they design team has the goals to achieve the "stealthy" in many areas:





1. It must be very hard to detect on radar.


2. The hot emissions from the engines must be minimal.


3. It must be quiet


4. Its engines should not produce contrails or exhaust smoke in cold atmosphere


5. It should be hard to see with the human eye





The stealth of the F-22 is due to a combination of factors, including the overall shape of the aircraft, the use of radar absorbent material (RAM), and attention to detail such as hinges and pilot helmets that could provide a radar return.





The F-22 has also been designed to disguise its infrared emissions to make it harder to detect by infrared homing ("heat seeking") surface-to-air or air-to-air missiles. Designers also made the aircraft less visible to the naked eye, and controlled radio and noise emissions.





The Raptor has an under bay carrier made for hiding heat from missile threats, like surface-to-air missiles.