Abstract
Thin steel sheets are used in a variety of structures, but a major disadvantage is their sensitivity to buckling. To overcome this, stiffeners are used in order to decrease the slenderness ratio and thereby increase the buckling load. In the present paper, a structural element based on the sandwich principle is presented, which can utilize the properties of thin, high-strength steel sheets in compression. In this way, an element is obtained with buckling stress exceeding the compressive yield strength of the steel, even for relatively high slenderness ratios. Compressive stresses up to 860 MPa have been measured on a 1·2 mm thick steel sheet of 400 mm length. Furthermore, the element can absorb large amounts of energy in both static and dynamic loading situations. In comparison with a non-sandwich structure, the energy absorbed per unit weight is almost doubled. In addition, it is shown that fatigue tests on thin steel sheets with negative loads can be performed with this element.
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