船体结构火工矫正工艺热弹塑性分析

Numerical Thermo-elastic-plastic Analysis on Flame Deformation Correction

在对船体结构火工矫正工艺的温度场进行数值分析的基础上 ,进而对火工矫正工艺的热弹塑性进行了分析 ,并对板厚及加热速度对残余应力及变形的影响做了研讨。

Weld distortion often occurs unavoidably in hull structure building. One eff ective way that most shipyards prefer to use to correct the weld distortion is f lame correction. Up to now, this kind of process usually depends on the experien ce of skilled workers and, as a result, brings about such problems as low effici ency and high costs. On the other hand, the increasing competition over the last few years in the shipbuilding industry has forced shipyards to increase product ivity and decrease costs. So the interest in shipbuilding automation, especially in the technology of correcting deformation by flame has increased enormously i n recent years. Research in this field has already been carried out in China and elementary findings have been made with the joint efforts of Dalian University of Technology and Dalian Shipyard. The temperature field of flame deformation correction, and the residual stresses and deformation of typical plate structure are analyzed in this paper. On this basis, ANSYS is used to simulate the three dimensional thermo-elastic-plastic process of the technology. According to the calculation results, the influence o f plate thickness and heating time on residual stress and deformation are discus sed. The intrinsic nature of the process of flame deformation correction is explored by analyzing typical welded structure. Since the technology is very complicated, and the deformation of ship structure involves many factors, only after a lot o f experiments and long time's work are performed, can we discover the general re gularity of the technology and achieve the automation of the technology of flame deformation correction.