典型船体部件装焊过程结构应力连续模拟研究

Process chain simulation of residual stresses in ship hull component during assembling and welding

焊接残余应力计算中最有效的方法之一是热弹塑性有限元法,但目前采用这种方法计算时很难按照船厂现场装配过程建模。针对这一问题,本研究采用工艺链连续模拟技术,按照船厂现场施工条件及装配流程,建立典型船体部件的拼焊点固、双面拼焊、肋板与桁材装配点固焊、肋板与桁材焊接的一系列工艺过程的连续计算模型,实现了该部件现场装焊过程的连续模拟,探索了装焊过程船体部件内应力的演变历程。研究表明:连续模拟技术可以用于预测船厂实际装焊过程的焊接残余应力,是探索工艺对船体结构强度影响的一项重要技术手段。

One of the most effective ways to analyze welding residual stresses is to perform a thermal elastoplastic finite element analysis. However,modeling residual stresses in an onsite assembly process in a shipyard would be difficult. To solve this problem,a chain simulation of manufacturing processes was used to simulate actual assembling and welding. A series of subsequent processes were modeled and simulated,including butt position welding,double-sided butt welding,position welding for assembling ribs and girders,and welding of ribs and girders. The evolution of the interior stress in the hull parts during assembly and welding was further explored. The results showed that the chain simulation of assembling and welding processes of ship hull components can be used to predict the occurrence of residual welding stresses in an actual processes and is an important way to computationally study the effects of workmanship on the ship＇s hull structure integrity.