Composite Box Beam Analysis: Theory and Experiments

This paper presents two comprehensive analysis methodologies for composite beams and describes experimental results obtained from a thin-walled, rectangular cross-sectional beam. The theoretical predictions are found in good agreement with the observed twist and strain distributions. Out-of-plane torsional wraping of the cross-section is found to be the key factor for an accurate modeling of the torsional behavior of such structures. The upper and lower panels of the beam are graphite/epoxy laminated plates with aluminum C-channels forming the webs