ISSN:
1741-2765
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The bending-stress distributions through thickness in sandwich-composite beams are different from those obtained by conventional composite-beam theory because of the shear effect of the core, especially when the ratio of elastic moduli of face to core (k=E f /E c ) is large. Accordingly, the stress distributions in sandwich beams of composite materials with various combinations of face and core materials subjected to four-point bending are analyzed by introducing the multilayer-buitup theory. The bending stiffnesses of face and core, and the relative displacement between both faces are taken into consideration in the analysis. Photoelastic measurements were carried out on model specimens having four differentk-values and the applicable ranges of the two theories are discussed on the basis of the experimental results. It is shown that the experimental-stress distributions in sandwich-composite beams havingk-values larger than 120 can be well explained by the multilayer-builtup theory. The ratio of the coupling moment due to the axial forces in the two faces to the applied total moment, which denotes the sandwich structural efficiency, can be well estimated by the multilayer-builtup theory. The availability of this simple onedimensional theory should be useful in the structural design of sandwich beams with a small-core rigidity.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02321232
Permalink
