Accession Number : ADA305550

Title :   Boron-Epoxy-Reinforced Titanium Aircraft Landing-Gear Drag Strut.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Howell, William A.

PDF Url : ADA305550

Report Date : NOV 1976

Pagination or Media Count : 33

Abstract : The structural performance of a boron-epoxy-reinforced titanium drag strut, containing a bonded scarf joint and designed to the criteria of a large commercial transport, has been evaluated experimentally and analytically. The strut was exposed to two lifetimes of fatigue loading and was statically loaded to the tensile and compressive design ultimate loads. Throughout the test program no evidence of any damage in the drag strut was detected by strain-gage measurements, ultrasonic inspection, or visual observation. The bonded joint was analyzed using the NASTRAN(R) (NASA Structural Analysis) computer program. A comparison of the strains predicted by the NASTRAN computer program with the experimentally determined values shows excellent agreement. An analytical study indicated that the nonlinear behavior of a structural spacer at each end of the strut could be explained by the inelastic behavior and possible creep of the adhesive. (AN)

Descriptors :   *EPOXY COMPOSITES, *TITANIUM ALLOYS, *LANDING GEAR, STRESS STRAIN RELATIONS, COMPUTER PROGRAMS, COMMERCIAL AIRCRAFT, FATIGUE LIFE, STRUCTURAL PROPERTIES, LOADS(FORCES), STATIC LOADS, STRUCTURAL ANALYSIS, TENSILE STRESS, FIBER REINFORCED COMPOSITES, MODULUS OF ELASTICITY, MATRIX MATERIALS, BONDED JOINTS, SHEAR STRESSES, TENSION, EPOXY LAMINATES, CREEP, VISUAL PERCEPTION, NONLINEAR ANALYSIS, BORON, TRANSPORT AIRCRAFT, FAILURE(MECHANICS), COMPRESSIVE STRENGTH, SKIN(STRUCTURAL), ADHESIVES, FATIGUE TESTS(MECHANICS), AXIAL LOADS, ULTRASONIC TESTS, STRUTS, CYCLIC LOADS, SHEET METAL, REINFORCEMENT(STRUCTURES).

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Transport Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE