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2. Resistenza meccanica ed a corrosione di giunti simili a sovrapposizione saldati mediante FSW.

Author

Castagnola, G., Squillace, A., Bitondo, C., Acerra, F., and Bellucci, F.

Subjects
*CORROSION resistant materials, *MECHANICAL behavior of materials, *FRICTION stir welding, *HEATING, *ELECTROCHEMISTRY, *POLARIZATION (Electricity), *MICROSTRUCTURE
Abstract

This paper describes both the mechanical and corrosion behaviour of similar made from AA2024 and AA6056, all in form of rolled sheet Friction Stir Welding (FSW) lap joints. The effects of heating using three different weld speeds, on both alloys employed in this work, were also investigated. Static mechanical tests were carried out providing infor-mation about static strengths and failure modes. Optical observation was used in investigating imicroscopically weld and welding defects. The corrosion behaviour of such joints was investigated by electrochemical dc techniques (open circuit potential -O.C.P. - monitoring and anodic polarization) using a cap-illary electrochemical cell, with a resolution of 0.5 mm. In order to confirm results obtained by local measure-ments, global gel visualization tests were also performed on the same specimens. The best mechanical and electrochemical performance was observed when the weld speed is low. In AA6056 fail-ure occurs in weld along the mixing area, while in the case of welding AA2024 it occurs mainly in the lower plate, most critical zone is the HAZ. [ABSTRACT FROM AUTHOR]

Published
2012

3. Numerical-Experimental Investigation into the Tensile Behavior of a Hybrid Metallic–CFRP Stiffened Aeronautical Panel

Author

Vincenzo Innaro, Salvatore Saputo, Angela Russo, Andrea Sellitto, Aniello Riccio, Francesco Acerra, Salvatore Russo, Sellitto, A., Saputo, S., Russo, A., Innaro, V., Riccio, A., Acerra, F., and Russo, S.

Subjects
Materials science, Plasticity, Composite number, 02 engineering and technology, lcsh:Technology, lcsh:Chemistry, 0203 mechanical engineering, Composite skin, General Materials Science, Composite material, lcsh:QH301-705.5, Instrumentation, Fluid Flow and Transfer Processes, FEM, lcsh:T, Process Chemistry and Technology, General Engineering, 021001 nanoscience & nanotechnology, lcsh:QC1-999, Finite element method, Computer Science Applications, 020303 mechanical engineering & transports, Tensile behavior, lcsh:Biology (General), lcsh:QD1-999, lcsh:TA1-2040, metallic/composite joints, Hybrid structure, Damage propagation, Hybrid structures, Metallic/composite joints, Metallic/composite joint, lcsh:Engineering (General). Civil engineering (General), 0210 nano-technology, hybrid structures, lcsh:Physics
Abstract

In this work, the tensile behavior of a hybrid metallic&ndash, composite stiffened panel is investigated. The analyzed structure consists of an omega-reinforced composite fiber-reinforced plastic (CFRP) panel joined with a Z-reinforced aluminum plate by fasteners. The introduced numerical model, able to simulate geometrical and material non-linearities, has been preliminary validated by means of comparisons with experimental test results, in terms of strain distributions in both composite and metallic sub-components. Subsequently, the inter-laminar damage behavior of the investigated hybrid structure has been studied numerically by assessing the influence of key structural subcomponents on the damage evolution of an artificial initial debonding between the composite skin and stringers.

Published
2020
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