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Analysis of SiC-2/ Aluminum Composite Box Beams

Oscar Barton, Jr. and Clinton Cornell United States Naval Academy Annapolis, MD 21402 and Edward Lenoe United States Military Academy West Point, NY 10996

Abstract

In this paper the relative capabilities of metal matrix composite (MMC) box beams fabricated by welding and brazing techniques are explored. The metal matrix composite system consist of silicon carbide fibers and T6061 aluminum matrix with the laminate stacking sequence of [0,±45, 0] s. To assess the potential, the resulting beams are examined using optical microscopy exploring both welded and brazed joint characteristics, hardness tested to generate hardness profile through the joined sections, and sectioned across the both the brazed and welded section producing tensile properties. Tensile test specimens were also machined from the flanges and web sections of the box structure and will provide needed mechanical response information. A final comparison comes through the free vibration dynamic analysis comparing fundamental frequencies of the beams. The four box beams were hot formed formed using two C shell sections. Each C section was fabricated using pre-formed, plasma sprayed composite metal sheets. These unidirectional sheets were arranged in the desired orientations and formed against a steel male mold producing a section which is 2 in x 4 in x 48 in. Subsequently, two C sections were joined to form four foot long box beam structures. The C-sections were either welded using conventional welding techniques or alternatively brazed with the webs configured in a stepped-lap configuration.

The United States Naval Academy offers interested midshipmen several avenues to engage in research activities. The most popular is the EM495 independent research course. This three- credit course couples the midshipmen with a faculty mentor and together a problem of mutual interest is explored. Midshipmen allowed to take this course must have a minimum grade point average of 3.4/4.0, develop a research proposal, and are encourage to disseminate their results through conferences. A final report culminates the course.

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Barton, J. O., & Lenoe, E., & Cornell, C. (2001, June), Analysis Of Si C 2/ Composite Box Beams Paper presented at 2001 Annual Conference, Albuquerque, New Mexico. 10.18260/1-2--8903