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首页> 外文会议>ASME Pressure Vessels Piping Conference;ASME Pressure Vessels and Piping Conference >FINITE ELEMENT ANALYSIS OF TAPPED THREAD JOINTS: SETUP OF A COMPUTATIONALLY EFFICIENT MODELING APPROACH
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FINITE ELEMENT ANALYSIS OF TAPPED THREAD JOINTS: SETUP OF A COMPUTATIONALLY EFFICIENT MODELING APPROACH

机译：攻丝螺纹接头的有限元分析：计算有效建模方法的建立

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This contribution deals with the efficient numerical modeling of tapped thread joints. Commercial FE packages provide different strategies to tackle the problem of modeling threaded joints, which is a recurrent one for the design engineer. Different modeling techniques are characterised by how the screw is modeled: either three-dimensional elements (thetra, hexa or wedge) or mono-dimensional elements (beam) can be used. In the case of three-dimensional approaches, the thread helix is seldom modeled: the actual geometry is often replaced by a plain cylinder and a suitable choice of contact settings between the screw and the "threaded" hole. In the case of road vehicles, due to the high number of threaded connections to be modeled, it is paramount to reach a trade-off between modeling accuracy and computational effort. This paper aims at comparing two modeling approaches, namely a three dimensional approach (baseline) and a mono-dimensional one (simplified model). Based on several criteria, such as equivalent stress on the screw shank, pressure distribution at the interface of the plates and in the underhead region, optimal contact settings for the simplified model are suggested. These settings allow replicating the results provided by the three-dimensional approach for given load case. The comparison is carried out on single lap, single screw joints, by the ANSYS R17 software. The methodology can be easily extended to other softwares or joint configurations.
机译：该贡献涉及攻丝螺纹接头的有效数值建模。商业有限元软件包提供了不同的策略来解决对螺纹接头建模的问题，这是设计工程师经常遇到的问题。不同的建模技术的特点是如何建模螺钉：可以使用三维元素（斜，六边形或楔形）或一维元素（梁）。在三维方法中，很少对螺纹螺旋进行建模：实际的几何形状通常由普通圆柱体代替，并在螺钉和“螺纹”孔之间选择合适的接触设置。对于公路车辆，由于要建模的螺纹连接数量众多，因此在建模精度和计算工作量之间取得折衷是至关重要的。本文旨在比较两种建模方法，即三维方法（基线）和一维方法（简化模型）。基于几个标准，例如螺钉杆上的等效应力，板的界面和头部下方区域的压力分布，建议了简化模型的最佳接触设置。这些设置允许在给定的载荷情况下复制三维方法提供的结果。比较是通过ANSYS R17软件在单圈，单螺杆接头上进行的。该方法可以轻松扩展到其他软件或联合配置。

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