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首页> 外文会议>International Conference on Global Trends in Joining, Cutting and Surfacing Technology >Integrative Simulation of an U-O-Forming Process Followed by a Welding Process Predicting Distortion and the Final Goods Properties by the Example of a Line Pipe Production
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Integrative Simulation of an U-O-Forming Process Followed by a Welding Process Predicting Distortion and the Final Goods Properties by the Example of a Line Pipe Production

机译：通过线管生产的示例，U-O成型过程的综合模拟随后是焊接过程预测失真和最终物品的性质

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During the last two decades computational simulations in the field of process design became more and more important. Today's goal values to be predicted include the process conditions e.g. process forces and the final goods properties. Therefore integrative approaches being capable of describing interactions between the materials properties and the outer process conditions are used. At RWTH Aachen University an integrated platform for materials processing called AixViPMaP was developed. This platform is open to any scientific or commercial simulation code and provides interfaces to interact between these different codes. Thus, it is possible to simulate whole individual process chains e.g. starting from the homogeneous, isotropic melt and ending with a lifetime prediction of the finished product under operational load. This work presents the use of the AixViPMaP by the example of a Line Pipe production. The considered simulation chain includes the U-O forming steps and the final welding step. To validate the simulation results an experimental process chain at the laboratory scale was conducted. The simulation of the U-O-forming is carried out using the commercial FE code ABAQUS. The elastic plastic material behaviour was determined using tensile tests. The Line Pipes final geometry and its stress strain state including the residual stresses and the local dislocation density is transferred to the structural welding simulation. The welding simulation is divided into two different kinds of simulations: process simulation and structural simulation. The process simulation is conducted using the self developed software SimWeld. The proprietary simulation software SYSWELD is used for the structural simulation. SimWeld is capable of calculating the temperature field and the welding pools geometry. Additionally, it provides an equivalent heat source and the welding bead geometry for the structural simulation. The described procedure allows reproducing different phenomena, which occur during welding processes. For example, the sheet edges after U-O-Forming show high local strains corresponding to high dislocation densities. This presupposes that recristalization occurs during welding affecting the final goods mechanical properties. Based on the simulation results a valuation of the relevant material properties strength and toughness can be made.
机译：在过去的二十年中，过程设计领域的计算模拟变得越来越重要。今天要预测的目标值包括例如过程条件。流程和最终物品属性。因此，使用能够描述材料特性与外部工艺条件之间的相互作用的综合方法。在亚琛大学RWTH Aachen大学，开发了一个名为AIXVIPMAP的材料处理平台。该平台对任何科学或商业仿真代码开放，并在这些不同代码之间提供互操作的接口。因此，可以模拟整个单独的过程链。从均匀，各向同性熔体开始，并以操作载荷的一生预测成品预测。这项工作介绍了通过线管生产的示例使用AIXVIPMAP。所考虑的仿真链包括U-O形成步骤和最终焊接步骤。为了验证仿真结果，进行了实验室规模的实验过程链。使用商业FE代码ABAQUS进行U-O形成的模拟。使用拉伸试验测定弹性塑料材料行为。线管最终几何形状及其应力应变状态包括残余应力和局部位错密度被转移到结构焊接模拟中。焊接仿真分为两种不同的模拟：过程仿真和结构模拟。使用Simweld进行自开发软件进行过程模拟。专有的仿真软件Sysweld用于结构模拟。 Simweld能够计算温度场和焊接池几何形状。另外，它提供了用于结构模拟的等效热源和焊珠几何形状。所描述的过程允许再现在焊接过程中发生的不同现象。例如，纸张边缘在U-O形成后显示出对应于高位脱位密度的高局部菌株。这假设焊接在影响最终物品机械性能期间发生蓄水化。基于仿真结果，可以进行相关材料性能强度和韧性的估值。

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