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.

Report Date:

1986-04-01

Pagination or Media Count:

23.0

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