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在进行大型结构焊接变形有限元分析时,为了固定整体结构刚体位移必须施加不少于6个自由度的约束,但对于自由状态下的结构而言,如何施加这6个最少约束是非常的困难,长期以来是困扰研究人员的难题,也是焊接结构有限元分析在工业现场应用的一个瓶颈。所谓惯性释放法就是可以在不加约束的情况下模拟自由结构的变形。该文将在航海航空领域得到广泛应用的惯性释放法引入大型焊接结构变形分析,解决了自由状态下结构必须施加约束的问题。首先以典型的对接接头为例,比较了两种不同的约束方法之间的差别。然后通过一个典型的船体焊接变形预测的实例,验证了惯性释放法在大型结构中应用的可行性,为焊接结构变形分析在工业生产中广泛应用提供了一个有效的方法。
In the finite element analysis of large structural welding deformations, it is necessary to impose a constraint of not less than 6 degrees of freedom in order to fix the rigid body displacement of the whole structure. However, it is very difficult for the structure in free state to exert these 6 least constraints Has long been a dilemma for researchers and a bottleneck in the field of finite element analysis of welded structures. The so-called inertial release method is able to simulate the deformation of the free structure without constraint. In this paper, the inertial release method, which is widely used in marine aviation, is introduced into the analysis of deformation of large welded structures to solve the problem that the structure must be restrained in the free state. First, taking a typical butt joint as an example, the difference between two different constraint methods is compared. Then, a typical example of ship deformation prediction is verified. The feasibility of the application of inertial release in large structures is verified. It provides an effective method for the application of deformation analysis of welded structures in industrial production.