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Bolted Joints

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Antonín Lokaj – One of the best experts on this subject based on the ideXlab platform.

  • Round Timber Bolted Joints Reinforcement Methods
    Advanced Materials Research, 2014
    Co-Authors: Kristýna Klajmonová, Antonín Lokaj

    Abstract:

    This paper presents the results of static tests of non-reinforced and reinforced round timber Bolted Joints with slotted-in steel plates. In this article, a new approach to the reinforcement of round timber Bolted Joints is presented. Based on results from tension tests of timber Bolted joint samples, reinforcement methods were proposed. From these, modified washers and boost with screws were chosen for further tension testing. Results were compared to unreinforced ones and rate of improvement established.

  • round timber Bolted Joints with mechanical reinforcement
    Advanced Materials Research, 2013
    Co-Authors: Kristýna Klajmonová, Antonín Lokaj

    Abstract:

    This paper presents the results of static tests of round timber Bolted Joints with inserted steel plates. All round timber Joints static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VSB-TU Ostrava. At first, timber specimens were tested without reinforcement. Based on these results, mechanical reinforcement methods were proposed: using modified washers and boost with screws. These samples were also tested. Rate of improvement in tensile strength was established for used reinforcement method.

Kristýna Klajmonová – One of the best experts on this subject based on the ideXlab platform.

  • Round Timber Bolted Joints Reinforcement Methods
    Advanced Materials Research, 2014
    Co-Authors: Kristýna Klajmonová, Antonín Lokaj

    Abstract:

    This paper presents the results of static tests of non-reinforced and reinforced round timber Bolted Joints with slotted-in steel plates. In this article, a new approach to the reinforcement of round timber Bolted Joints is presented. Based on results from tension tests of timber Bolted joint samples, reinforcement methods were proposed. From these, modified washers and boost with screws were chosen for further tension testing. Results were compared to unreinforced ones and rate of improvement established.

  • round timber Bolted Joints with mechanical reinforcement
    Advanced Materials Research, 2013
    Co-Authors: Kristýna Klajmonová, Antonín Lokaj

    Abstract:

    This paper presents the results of static tests of round timber Bolted Joints with inserted steel plates. All round timber Joints static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VSB-TU Ostrava. At first, timber specimens were tested without reinforcement. Based on these results, mechanical reinforcement methods were proposed: using modified washers and boost with screws. These samples were also tested. Rate of improvement in tensile strength was established for used reinforcement method.

Yusuke Fukuba – One of the best experts on this subject based on the ideXlab platform.

  • mechanical behavior of rotational screw thread loosening in Bolted Joints under repeated temperature changes
    Volume 2: Computer Applications Technology and Bolted Joints, 2008
    Co-Authors: Toshiyuki Sawa, Mitsutoshi Ishimura, Yasumasa Shoji, Yusuke Fukuba

    Abstract:

    Bolted Joints have been used in mechanical structures. However, loosening accidents sometimes happen under several types of loadings. Recently, some studies have been conducted on the screw thread loosening in Bolted Joints. It is verified that Bolted Joints are loosened when transverse repeated loadings are applied. A lot of parts for preventing the loosening in the Joints have been proposed. Among these parts, eccentric nut is especially expected to be the solution for preventing the loosening. Some studies on no rotational loosening in Bolted Joints under thermal changes have also conducted. However, few studies on rotational screw thread loosening in Bolted Joints have conducted. In our previous study, mechanism of rotational screw thread loosening in Bolted joint under repeated temperature changes was examined. However, the difference in the loosening mechanism between the FEM results and the experimental results was substantial. In this study, the effect of the incline at the bearing surfaces was taken into consideration on the loosening. In addition, the loosening in the Bolted joint with the eccentric nut under repeated temperature changes was examined using finite element method (FEM) calculations. Discussion is made on the mechanism and a solution of rotational screw thread loosening in the Bolted Joints under the repeated temperature changes. The results show that a reduction in axial bolt force was increased when the incline at the bearing surfaces was taken into consideration and the eccentric nut was shown for preventing the bolt loosening.Copyright © 2008 by ASME

  • mechanism of rotational screw thread loosening in Bolted Joints under repeated temperature changes
    Volume 2: Computer Applications Technology and Bolted Joints, 2007
    Co-Authors: Toshiyuki Sawa, Mitsutoshi Ishimura, Hiroshi Yamanaka, Yusuke Fukuba

    Abstract:

    Bolted Joints have been used in mechanical structures. However, loosening accidents sometimes happen under several types of loadings. Recently, some studies have been conducted on the screw thread loosening in Bolted Joints. It is verified that Bolted Joints are loosened when transverse repeated loadings are applied. Some studies on no rotational loosening in Bolted Joints under thermal changes have also conducted. However, few studies on rotational screw thread loosening in Bolted Joints have conducted. In this study, rotational screw thread loosening in Bolted joint under repeated temperature changes is examined. Effects of the linear thermal expansion coefficient of clamped parts and number of repeated temperature changes are examined by the measurements and finite element analyses. In the experiments, a Bolted joint, which consist of two rectangular plates fastened at room temperature by two bolts and nuts, are put in a furnace and heated by an electric heater. Then, the Bolted joint is cooled at room temperature. These thermal cycles are repeated. Bolt temperature and bolt load were measured. Loosening is evaluated from the reductions in the bolt load. Finite element analyses were carried out for clarifying the loosening mechanism. Discussion is made on the mechanism of rotational screw thread loosening in Bolted Joints under repeated temperature changes. The results show that loosening occurs under repeated temperature changes due to difference in the linear thermal expansion coefficients of the different clamped parts.Copyright © 2007 by ASME