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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >INITIAL DEVELOPMENT OF A NUMERICAL METHODOLOGY TO SIMULATE THE ROLLER EXPANSION FORMING PROCESS
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INITIAL DEVELOPMENT OF A NUMERICAL METHODOLOGY TO SIMULATE THE ROLLER EXPANSION FORMING PROCESS

机译：初步模拟轧辊膨胀成形过程的数值方法

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摘要

A distinguishing design feature of CANDU~® nuclear reactors is the use of horizontal fuel channels housed in a horizontal vessel called a calandria, which is made of stainless steel 304L. Each channel consists of a Zr-2.5%Nb alloy pressure tube and an externally concentric Zr-2 calandria tube. The calandria tubes are joined to the end plates (tubesheets) of the calandria vessel by joints formed by roller expansion. The bores in the tubesheets are grooved. Roller expanded joints provide a cost effective means of joining dissimilar materials, require minimal space and no maintenance. The quality of these roller expanded joints is important from a sealing, strength and stress corrosion point of view. The roller expansion process consists of expanding the calandria tubes to deform them plastically against the bores and into the grooves of the tubesheets. Therefore, understanding the effect of the number, geometry and the pitch of the grooves on the quality of a roller expanded joint is very important. The objective of this paper is to present a numerical methodology developed to optimize the design of such roller expanded joints with particular interest on the effect of the grooves. This numerical analysis was used as an adjunct to assist the related design test program. The numerical techniques required to simulate the behaviour of calandria tubes during roller expansion involve the evaluation of large deformations, large plastic strains and stresses and rapidly changing contacts. The LS-DYNA general-purpose finite element computer code was selected for such simulations. A three-dimensional finite element model was developed so that the sweeping of the rollers while under outward radial movement is properly modelled and the plastic deformation and flow of the calandria tube material into the tubesheet grooves are accurately simulated. The paper discusses this numerical methodology, presents results of general interest, and makes comparisons with associated experimental data and other available results.
机译：CANDU〜®核反应堆的显着设计特征是使用水平燃料通道，该水平燃料通道容纳在称为calandria的水平容器中，该容器由304L不锈钢制成。每个通道由一个Zr-2.5％Nb合金压力管和一个外部同心Zr-2排管组成。加热管通过辊膨胀形成的接头连接到加热管容器的端板（管板）。管板中的孔带有凹槽。滚子膨胀节提供了一种连接异种材料的经济有效的方式，需要的空间极小且无需维护。从密封，强度和应力腐蚀的角度来看，这些滚轴膨胀节的质量很重要。滚筒膨胀过程包括使排管膨胀，使排管在孔内塑性变形，并进入管板的凹槽。因此，了解沟槽的数量，几何形状和间距对滚柱伸缩缝质量的影响非常重要。本文的目的是提出一种数值方法，以优化这种滚子伸缩缝的设计，并特别关注凹槽的影响。此数值分析被用作辅助相关设计测试程序的辅助工具。在滚筒膨胀过程中模拟排管的性能所需的数值技术包括评估大变形，大塑性应变和应力以及快速变化的接触。选择LS-DYNA通用有限元计算机代码进行此类仿真。建立了三维有限元模型，以便对径向向外运动时滚子的扫掠进行正确建模，并精确模拟了排管材料进入管板凹槽的塑性变形和流动。本文讨论了这种数值方法，提出了普遍感兴趣的结果，并与相关的实验数据和其他可用结果进行了比较。

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