On the Choice of Shear Correction Factor in Sandwich Structures VICTOR BIRMAN* Engineering Education Center, University of Missouri-Rolla, 8001 Natural Bridge Road, St. Louis, MO 63121, USA CHARLES W. BERT Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019-1052, USA ABSTRACT: The first-order shear deformation theory (FSDT) is a relatively simple tool that has been found to yield accurate results in the non-local problems of sandwich structures, such as buckling and free vibration. However, a key factor in practical application of the theory is determination of the transverse shear correction factor (K), which appears as a coefficient in the expression for the transverse shear stress resultant. The physical basis for this factor is that it is supposed to compensate for the FSDT assumption that the shear strain is uniform through the depth of the cross section. In the present paper, the philosophies and results of K determination for homogeneous rectangular cross sections are first reviewed, followed by a review and discussion for the case of sandwich structures. The analysis presented in the paper results in the conclusion that K should be taken equal to unity, as a first approximation, for both two-skin as well as for multi-skin sandwich structures. INTRODUCTION T HE PURPOSE OF using sandwich construction in the first place is to provide a stronger and stiffer structure for the same weight, or conversely a lighter structure to carry the same load, as a homogeneous or compact-laminate flexural member. The main load-carrying portions are the stiff facings and the purpose of the core is to serve as a spacer or separator to keep the facings apart at a large distance from the neutral surface. The facings and core play analogous roles to the flanges and web of an *Author to whom correspondence should be addressed. Journal of SANDWICH STRUCTURES AND MATERIALS, Vol. 4 — January 2002 83 1099-6362/02/01 0083–13 $10.00/0 DOI: 10-1106/109963602021180 ß 2002 Sage Publications at UNIV OF OKLAHOMA on January 20, 2016 jsm.sagepub.com Downloaded from
On the Choice of Shear Correction Factor in Sandwich Structures
Jun 24, 2023
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