Article

The Ovalisation of Thin-walled Circular Tubes Subjected to Bending

Lecture Notes in Engineering and Computer Science 01/2008;
Source: DOAJ
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    ABSTRACT: The bending collapse behaviour of rectangular and square section tubes is studied theoretically and experimentally. A limit analysis technique was employed and a set of formulae relating the hinge moment and associated angle of rotation was derived. The theoretical predictions were verified by comparison with 56 quasi-static bending tests on 27 different sections having aspect ratios () varying between 3.0 and 0.33 and with width to wall thickness ratios () between 128 and 9.14. Very good agreement was found between the theoretical predictions and experimental results for the whole range of sections.
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    ABSTRACT: The moment-rotation properties of square thin-walled tubes were measured up to and beyond bending collapse with a unique bending machine that was capable of applying a pure bending moment to large deflections without significant shear or tensile forces. This allows an accurate determination of a tube's maximum moment and plastic behaviour prior to collapse, the rotation at which collapse is initiated, as well as the resulting collapse curve. The results were compared with existing analytical predictions. In addition, the finite length of the local plastic collapse mechanism was determined by adjusting the deformable length of the test specimens. The concept of a finite mechanism length is important for the purposes of modelling the behaviour of structures such as bus frames that are commonly made from thin-walled tubes.
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