在体壳单元组合有限元模型中,由于实体元与壳元的自由度不同,使得转动自由度不连续,计算结果往往与实际偏差很大。Abaqus中提供了一种多点约束法来实现三维实体元与壳元正确联接,阐述了其原理,并通过实例对两种单元联接参数设置的不同进行结果对比,给出了合理的处理方法,为有限元分析中体壳单元耦合及模型简化提供指导与借鉴。

In the finite element model with the combination of solid and thinshel elements,the problems of discontinuity exit in the turning degree of freedoms due to the difference of node degree of the freedoms.This results in a big deviation between the calculated result and the practice. A kind of MPC method in Abaqus is put forward to realize correct junction of the solid with thinshel elements and its principle is explained in this paper. As compared with the different connected parameters set for each unit,the reasonable processing method is given out.The guidance and reference are provided for the coupling of the solid and thinshel elements in the finite element analysis.

堆内构件上支承组件采用不同的建模方法,分别采用壳单元和梁单元相组合的建模模式、壳单元和壳单元相组合的建模模式、实体单元建模的模式,对堆内构件上支承组件进行了有限元应力计算,比较了不同建模模式下应力计算的各自特点,堆内构件上支承组件实体单元建模模式应力计算结果精确并能满足RCC-M规范应力评定要求,壳单元和梁单元相组合的建模模式、壳单元和壳单元相组合的建模模式应力计算结果保守且应力评定需等效处理其计算结果。堆内构件上支承组件采用整体实体单元全模型建模的计算方法,计算精确且应力评定简单直接,它可应用于其他工况和不同堆芯堆内构件应力计算及其应力评定。

Reactor vessel internal upper support assembly adopt shell element combined with beam ele-ment to create model,shell element to create model and solid element to create model,which carry through respective finite element analysis calculation and stress evaluation.The stress calculation effect of reactor vessel internal upper support assembly adopting solid element model created is conservative and high precision by means of modification and simplification about preexistent stress analysis method related to reactor vessel internal,which can satisfy the demand of RCC-M criterion.The calculation method of reactor vessel internal upper support assembly adopting solid element to create model is simplification and practicality by comparing with different creating model mode about stress calculation mentioned above, which may apply to the stress analysis and evaluation of reactor vessel internal assembly related to differ-ent reactor core.

如何使用简化方法对装配体进行仿真引起了许多研究者的关注。从一个实际的例子出发。以ANSYSWorkbench为平台，对一个三维装配体进行简化建模，直接在原始三维模型的基础上。用面体来创建板壳模型，用线体来创建梁模型，并通过焊接模式来建模线体模型、板壳模型和实体模型之间的连接关系。以苗床自动覆膜系统在自身重力下的刚度计算为实例，对比了未简化模型与简化模型的分析结果，计算表明该方法的效率是未简化模型的11．6倍，而精度损失很少。

How to use the simplified method simulate the assembly has attracted the attention of many researchers. For a practical example, a 3D assembly model is simplified based on ANSYS Workbench On the basis of the origi-nal 3D model directly, create the plate and shell model with surface body and create a beam model with the line body,the connection relationship between the plate, shell and solid is simulated use spot welding.Take the calcula-tion of rigidity of a seedbed automatic labeling system under its own gravity for example, compare the analysis re-sults of the simplified model and unsimplified model.The result shows that the computational efficiency of this meth-od is 11.6 times higher than that of the unsimplified model, and the loss of precision is very small.

为满足驱动桥壳越来越高的性能需求,以TY-1型商用驱动桥壳为研究对象,通过HyperMesh软件建立以3D实体单元为基本单元的有限元模型,在此基础上对驱动桥壳结构的静力、模态性能进行分析,得出应力、应变分布情况和前5阶模态下的固有频率及振型。分析结果表明,桥壳强度和刚度基本满足设计要求,且不会与地面激励产生共振。对驱动桥壳进行疲劳寿命分析,得到疲劳寿命云图,结果表明桥壳疲劳强度满足要求,进一步验证了设计的合理性。

To cope with the more and more strict requirements of drive axle housing, we use TY-1 commercial drive axle housing as the research object and build the finite element model with 3D solid units as basic units by software HyperMesh. On that basis, we analyze the static and modal performance, and conclude the stress and strain distribution and the inherent frequency and vibration shapes of the former 5 order modes. The results of the analysis show that the strength and stiffness basically meet the design requirements, and would not produce resonance with the ground excitation. Then the fatigue life of drive axle housing is analyzed, and the fatigue life cloud chart is obtained, the results show that the fatigue strength of the axle housing meet the requirements, which justify correctness of the design.

建立三维实体混杂复合材料层压板与钛合金板单搭接的连接分析模型,使用ABAQUS有限元软件中的连续壳单元(Continuum Shell)和通用接触(General Contact)算法对层压板和紧固件连接进行模拟。理论计算的失效模式和破坏载荷与试验结果吻合较好,在此基础上调整织物铺层顺序和方向,对比分析其性能差异。

A three-dimensional single lap joint analytical model was developed. The composite laminate connected with titanium alloy plate by bolted joints. The Continuum shell and General contact were used to simulating composite laminates and mechanically fastened joints. The numerical results show that the present model can predict the failure mode and failure load very well. Fabric ply stacking sequence and direction were adjusted for comparing performance difference by using such model.