Accession Number : ADA188076

Title :   Measurements of the Out-of-Plane Displacement of an Axially Loaded Cracked Metal Sheet with a CFRP (Carbon Fibre Reinforced Plastic) Repair Patch.

Descriptive Note : Technical memo.,

Corporate Author : ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)

Personal Author(s) : Kemp, R M

PDF Url : ADA188076

Report Date : Apr 1986

Pagination or Media Count : 23

Abstract : An adhesively bonded carbon fibre reinforced plastic (CFRP) repair patch situated centrally on one face of a 1.6mm thick sheet test piece of aluminum alloy 7475-T761 containing a central fatigue crack caused an out-of-plane displacement when the test piece was loaded in tension normal to the crack length. Out of plane displacements for two crack length (2a = 75 mm and 2a = 94 mm) were measured using a dial guage. The magnitude of the displacement depended upon crack length and was nonlinear function of applied load. A greater displacement per load increment occurred at low loads and there was a tendency towards a limiting value at high loads. A moire shadow technique was also used to measure displacement and the results agreed well with dial guage measurements. Keywords: Fatigue, Aluminum alloy, Repair patch, Carbon fibre.

Descriptors :   *ALUMINUM ALLOYS, *DISPLACEMENT, *REINFORCED PLASTICS, *SHEETS, *CARBON REINFORCED COMPOSITES, CARBON FIBERS, CRACKS, FATIGUE(MECHANICS), GAGES, INSTRUMENT DIALS, MOIRE EFFECTS, NONLINEAR ANALYSIS, REPAIR, MAINTENANCE, ULTRASONIC TESTS, ADHESIVE BONDING, LAMINATES, FIBER REINFORCED COMPOSITES, TENSILE STRESS, GREAT BRITAIN

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE