Papers by Keyword: Lateral Bending

Abstract: Continuous Roll Forming process (CRFP) is a newly developed technique applied to form 3D surface part with various transverse and longitudinal curvatures. In CRFP, the sheet metal is non-uniformly compressed in the roll gap between the upper and lower bendable rolls. The two bendable rolls rotate in opposite directions, and the sheet metal is bitten into the roll gap continuously. At the present, the deformation characteristics of the sheet metal in the deformation zoon (sheet metal between the upper and lower bendable roll) is discussed. The friction force in CRFP can be calculated according to the Coulomb friction law.

Abstract: In this paper, vibration analysis of a blade modeled as an anisotropic composite thin-walled beam is carried out. The analytical formulation of the beam is derived for the flapwise bending, chordwise bending and transverse shear deformations. The equations of motion are solved by applying the extended Galerkin method (EGM) for anti-symmetric lay-up configuration that is also referred as Circumferentially Uniform Stiffness (CUS). Consequently, the natural frequencies are validated by making comparisons with the results in literature and it is observed that there is a good agreement between the results. Combined effects of transverse shear, fiber orientation, and rotational speed on the natural frequencies are further investigated.

Abstract: Lateral bending of L-shape plate is a novel forming technology to manufacture flange-like parts from angle bar or L-shape plate. However, the inevitable rollers deflection induced by rolling force leads to significant decrease in radius prediction accuracy of the flange products. Therefore, the radius compensation is implemented through adjusting forming parameters in order to obtain a flange product with the designed radius. In the paper, the rolling force and rollers deflection are solved with considering the workpiece-roller interaction; on this basis, a radius compensation scheme is proposed and evaluated. The results show that the predicted radii deviate from the desired ones less than 7.22%.

Abstract: The design of reinforced concrete beams has usually focused on the ultimate flexural capacity and disregarded the lateral stability of the beams. However, the development of high-strength concrete and the implementation of new construction techniques increase the use of longer and deeper concrete beams, which makes the lateral instability a primary concern of failure in concrete bridges. In particular, the lateral stability should be more taken into consideration in the construction and erection phases due to inadequate lateral supports. Thus, an experimental study was carried out to evaluate the lateral torsional buckling of reinforced concrete beams with initial geometric imperfections. The lateral flexural and torsional rigidity expressions, which could account for the flexural, torsional, and shrinkage cracking of concrete, the contribution of longitudinal and shear reinforcement, and the nonlinearity of materials, were proposed for rectangular reinforced concrete beams. Finally, this study proposed an analytical formula to estimate the buckling loads of initially imperfect reinforced concrete beams. The estimates of the study showed close agreement with the experimental values.

Abstract: The flexural strength and microhardness of free-standing anodic alumina films obtained from the one-sided anodization of aluminum are discussed. The films formed of high-pure aluminum were shown to have maximum flexural strength. Even a small amount of impurities decreases the flexural strength of the resulting free-standing anodic alumina films to be associated with their higher defectiveness. The microhardness of thick films of anodic alumina measured on the side of a barrier layer is independent of the film thickness, and this measured on the side of the porous layer decreases continuosly from 5.39-5.88 GPa to 2.94 GPa when the film thickness increases from 50 to 500 μm. The microhardness of thin (<100 μm) films of porous anodic alumina was studied as well. When the samples were immovable in the electrolyte during the anodization, the microhardness of the resulting films is low and varies from 0.93 to 1.86 GPa. When the samples moved in the electrolyte occasionally during the anodization, the microhardness of the resulting films increases to 1.67 – 2.45 GPa. When the samples moved in the electrolyte continuously during the anodization, the microhardness of the resulting films increases to 2.45 - 3.43 GPa. This is associated with the rate of the heat removal from the sample (the oxidation rate) during the anodization. The microhardness of the free-standing porous anodic alumina films formed of low binary alloys of aluminum is lower than one of films formed of high-pure aluminum.

Abstract: For the reasons of prestressing and other factors, the lateral bending would appear on the post-tensioned concrete T-beam during the pre-tensioning. In this paper, a simulation model is established as an example of the edge beam of 40-m T-beam which is widely used. According to the stress and displacement of main girder under different orthogonal force, the effects of lateral bending on the main girder are analyzed. Finally, some guidelines are suggested.

Abstract: In order to research the forming mechanism lateral bending during side pressing for continuous casting slab, the simulation model was established using finite element method. It is mainly studying object for the effect of the different position of double dies on the lateral bending, to make nodes displacement fluctuation in corresponding position of slab head and tail as the degree of lateral bending of continuous casting slab along its width direction. It can obtain the rules of metal flow along the rolling direction, when dies position deviation respectively is 0 mm, 10mm, 20 mm, 30 mm, 40 mm and 50 mm, under the other conditions remain unchanged, the bigger the dies position deviation, the bigger the corresponding pitch nodes displacement, and the bigger the lateral bending for slab. The results provide the theoretically support for the controlling position accuracy of the dies in live and enhancement the useful rate of the slab for production field.