The Second Stiffest Axis of a Beam-Column: Implications for Cervical Spine Trauma

[+] Author and Article Information
Y. King Liu, Q. Guo Dai

Center of Materials Research, Department of Biomedical Engineering, University of Iowa, Iowa City, IA 52242

J Biomech Eng 111(2), 122-127 (May 01, 1989) (6 pages) doi:10.1115/1.3168352 History: Received October 03, 1988; Revised March 01, 1989; Online June 12, 2009


Based on an idealized model of a homogeneous, isotropic beam-column, the second stiffest axis under static loading was derived. The maximum allowable force for the second stiffest axis was then examined. The ratio of the maximum allowable forces of the second stiffest axis to the stiffest axis was established. The stiffness ratio of the second stiffest axis to the stiffest axis was also found. Taking buckling into consideration, the safe load region for all possible acting directions was derived. The implications of the idealized model for cervical spine trauma are discussed.

Copyright © 1989 by ASME
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