The Experts below are selected from a list of 60 Experts worldwide ranked by ideXlab platform

Liu Xufeng - One of the best experts on this subject based on the ideXlab platform.

  • Stress analysis and optimization design of S-bend for ITER feeder
    Nuclear Fusion and Plasma Physics, 2020
    Co-Authors: Liu Xufeng
    Abstract:

    Based on the energy principle,by means of the unit force method and the Castigliano Theorem,the moment and stress distribution along the S-bend under the given displacement deformation are calculated analytically.According to the calculation,the moment and the stress along the S-bend arise mainly due to the thermal contract,but the gravity effect is nonnegligible.The maximum stress along the S-bend will increase by over 10% after the gravity effect is taken into account.Based on the premise that the height of S-bend is limited,it is found that the smaller the radius of the circles,the smaller the maximum stress along the S-bend,so we can choose the appropriate radius according to the required stress strength and the processing technology during the detailed design.Results shows that the analytical method proposed here is effective and useful for the structure optimization of the practical engineering design.

Muammer Nalbant - One of the best experts on this subject based on the ideXlab platform.

  • Finite element analysis of bending occurring while cutting with high speed steel lathe cutting tools
    Materials & Design, 2020
    Co-Authors: Abdullah Duran, Muammer Nalbant
    Abstract:

    The bending which occurs on a cutting tool during machining on a lathe affects tool life, surface roughness and dimension correctness. In this research, the bending which has been calculated by Castigliano Theorem has been compared with the bending obtained by finite element method. Under the constant cutting conditions, material C1060 has been machined with high speed steel (HSS) lathe cutting tools having 60°, 75° and 90° of cutting edge angle. It was determined by using ANSYS finite elements program that the bending of the cutting tool generated by the forces, which varied between 1360 N and 1325 N and occurred during cutting, varied between 0.039958 and 0.04373 mm. According to the results, it has been observed that the bending that was calculated by Castigliano Theorem and that varied between 0.03542 and 0.034505 mm was almost the same with the bending determined by finite elements method. In other words, it was seen that the calculated values approach to the analysed results up to 0.4% .

Vladimir Svehla - One of the best experts on this subject based on the ideXlab platform.

Zhang Xuanli - One of the best experts on this subject based on the ideXlab platform.

Charles R Farrar - One of the best experts on this subject based on the ideXlab platform.

  • modeling and analysis of a cracked composite cantilever beam vibrating in coupled bending and torsion
    Journal of Sound and Vibration, 2005
    Co-Authors: Kaihong Wang, Daniel J Inman, Charles R Farrar
    Abstract:

    The coupled bending and torsional vibration of a fiber-reinforced composite cantilever with an edge surface crack is investigated. The model is based on linear fracture mechanics, the Castigliano Theorem and classical lamination theory. The crack is modeled with a local flexibility matrix such that the cantilever beam is replaced with two intact beams with the crack as the additional boundary condition. The coupling of bending and torsion can result from either the material properties or the surface crack. For the unidirectional fiber-reinforced composite, analysis indicates that changes in natural frequencies and the corresponding mode shapes depend on not only the crack location and ratio, but also the material properties (fiber orientation, fiber volume fraction). The frequency spectrum along with changes in mode shapes may help detect a possible surface crack (location and magnitude) of the composite structure, such as a high aspect ratio aircraft wing. The coupling of bending and torsion due to a surface crack may serve as a damage prognosis tool of a composite wing that is initially designed with bending and torsion decoupled by noting the effect of the crack on the flutter speed of the aircraft.