DEFORMABLE CONTROL SURFACES WITH SHAPE MEMORY ALLOY ACTUATORS

RECENT DEVELOPMENTS IN THE AREAS OF COMPOSITE AIRFRAME STRUCTURES AND SHAPE MEMORY ALLOY (SMA) MATERIALS HAVE LED TO NEW INTEREST IN THECONCEPT OF DEFORMABLE CONTROL SURFACES BECAUSE OF THE POTENTIAL BENEFITS OF LOW RADAR CROSS SECTION, HIGH RELIABILITY AND MODERATE COST.FOR A MISSILE WITH DEFORMABLE SURFACES, THE COMPOSITE STRUCTURES WOULD BE LARGELY TRANSPARENT TO RADAR, AND COMBINED WITH THE FINE WIRES OF SMA ACTUATORS, SHOULD RESULT IN A LOWER RADAR CROSS SECTION. BIOMETAL AND FLEXINOL ARE SMAS WHICH HAVE A MUSCLELIKE CONTRACTION WITHFORCES OF 20,000 PSI. THERE ARE THREE INDEPENDENT FUNDAMENTAL MODESOF FLEXURE: FLEXING THE MISSILE BODY ITSELF, FIN CURLING AND FIN TWISTING. THE PROPOSED PHASE I EFFORT WILL EXAMINE AREAS OF UNCERTAINTYTO DETERMINE WHETHER THE CONCEPT WARRANTS FURTHER STUDY AND BUILD A BODY OF EXPERTISE TO BE USED IN PHASE II EXPLORATION OF THE CONCEPT.OAKTREE AUTOMATION IS ACTIVELY ENGAGED IN THE DEVELOPMENT OF INNOVATIVE SMA APPLICATIONS. SCALED COMPOSITES, INC., WITH A WORLD-RENOWNEDREPUTATION FOR THE DESIGN AND DEVELOPMENT OF INNOVATIVE AEROSPACE STRUCTURES AND UNIQUE AIRCRAFT, WILL SERVE AS A CONSULTANT TO PROVIDE EXPERTISE IN AERONAUTICAL ENGINEERING AND COMPOSITE STRUCTURES DESIGN.