Aluminium/lithium alloy-CFRP hybrid laminate: Fabrication and properties

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:143578

Freischmidt, G; Coutts, R S.P. ^[1]; Janardhana, M N ^[2]

---

1. CSIRO, Clayton, Victoria (Australia). Division of Forest Products
2. Royal Melbourne Institute of Technology, Victoria (Australia). Aerospace Engineering

Hybrid composite laminates of aluminum and aluminum/lithium alloy sheeting with unidirectional carbon fiber/epoxy plies have been fabricated to produce sheet materials of high strength, low density and reduced fatigue crack growth rate. In an arrangement of one layer of unidirectional carbon fiber reinforced plastic (CFRP) and 2 sheets of 2090-T3 aluminum alloy was used to give a material with a density of 2.20g/cm{sup 3}. Tensile test results gave an ultimate strength of 803MPa, a modulus of 75.7GPa and a 2% offset yield strength of 497MPa. Preliminary fatigue crack growth rate determinations on single edge notch (SEN) specimens show a marked reduction compared to monolithic 2090-T3. Other hybrid laminates using 2024-T3 alloy have also been made and tested. These laminates show reduced tensile properties, however, they appear to have lower fatigue crack growth rates than when using 2090T3 in hybrid form. The fabrication of hybrid laminates included the use of unsupported adhesive film to bond the precured unidirectional carbon fiber composite plies to the aluminum sheeting. This has left a distinct interphase region between the alloy and CFRP which is thought to improve properties through an effective load transfer.

• OSTI ID: 143578
• Report Number(s): CONF-930246--; ISBN 0-87339-251-5
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
COMPOSITE MATERIALS
FABRICATION
FRACTURE PROPERTIES
LITHIUM ALLOYS
MECHANICAL PROPERTIES
TENSILE PROPERTIES