Design and technological optimization of overhead traveling cranes’ box girders
The residual stressstrain state of welded joints of cranes’ steel structures is understudied scientific and technical issue. Finiteelement analysis of the postweld residual stresses in longitudinal Tjoints of overhead cranes’ box girders was applied to this study. Goldak’s moving heat source model based on doubleellipsoid heat flux distribution was used. Thermal and mechanical tasks were sequentially solved, wherein the phase transformation processes were taken into consideration. The effects of such factors as box girder geometry, welding speed, preheating technology on the residual stresses and phase distribution in longitudinal welds were further investigated. The postweld stressstrain state of the box girders’ Tjoints was detailed. The recommendations to streamline the overhead cranes girders’ production technology intended to improve their quality and overall technological level were formulated. The necessity of taking into account the phase and structural transformations in the simulation is proved. The requirements for the finiteelement modeling of longitudinal Tjoints were established.