Search

Copyright of Journal of Machine Construction & Maintenance is the property of Institute for Sustainable Technologies - National Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The location of hole during welding of aluminium has influence on residual stresses. 2D FEM model of the welded plate, lying on the surface of welded sheets, was used. The calculations were done with ANSYS in two phases, thermal and mechanical calculations of deformations and stresses, with non-linear temperature dependent material properties. Different location of hole was used. Residual stresses after welding near hole were higher as without. The maximums of tensile stresses were concentrated at small areas on edge of hole. They are too small for experimental measuring, but maybe sufficient significant for crack propagation or local stress corrosion. [ABSTRACT FROM AUTHOR]

Heat, necessary for welding, casue to deformation and stresses. Right technology can decrease this deformation and stresses. With FEM simulation is possible to calculate his value. At the paper was shown simulation of butt welding of austenitic steel. Temperature-dependent material properties were used. Here were compared effects of different beads: one string or divided to 2 steps, with combined welding sequences. [ABSTRACT FROM AUTHOR]

Rail and the wheel contact introduces under the surface of the tread wheel deformation of the ferrite phase and simultaneously generates cracks in the cementite. In the ferrite phase, there is the greatest deformation due to the lower hardness than cementite fragmented. As a result, the ferritic matrix is strengthened sharply by increasing the dislocation density. Crack initiation occurs mainly along very elongated grains of proeutectoid ferrite (along the grain boundaries of the former austenite). Microstructure indicates that the highly deformed areas of proeutectoid ferrite facilitate the propagation of cracks. The paper presents the cases of peeling occurring on the tread monobloc. [ABSTRACT FROM AUTHOR]

Heat, necessary for welding, casue to deformation and stresses. Right technology can decrease this deformation and stresses. With FEM simulation is possible to calculate his value. At the paper was shown simulation of butt welding of aluminum. Temperature-dependent material properties were used. Here were compared effects of different beads: one string, divided to 2,3, or 5 steps with centripetal, isotropy and back-reversed-steps, with combined welding sequences. [ABSTRACT FROM AUTHOR]

The use of pulsed arc for welding of aluminium has influence on residual stresses. 2D FEM model of the welded plate, lying on the surface of welded sheets,1337 finite elements, was used. The calculations were done with ANSYS in two phases, thermal and mechanical calculations of deformations and stresses, are non-linear with temperature dependent material properties. Different type of pulse was used. Results from temperature analysis were used in stress calculation. Some residual stresses after pulsed arc welding were higher as after constant. The maximums of tensile stresses were concentrated at small, perpetual areas. They are too small for experimental measuring, but significantly sufficient for crack propagation or local stress corrosion. [ABSTRACT FROM AUTHOR]