Manufacture of defined residual stresses in friction assisted spinning and flow-forming

该项目的目的是扩大摩擦纺丝工艺的基础研究有关制造高性能部件的航空和航天工程具有明确的残余应力状态。以这种方式产生的局部适应残余应力分布是为了改善零件的质量和功能，例如，通过允许以定义的方式延迟或触发故障。因此，总体目标是在组件的整个和负载相关区域调整已定义的残余应力分布，以提高其质量和功能。所追求的研究假设是，残余应力分布可以精确地、可重复地、有效地调整整个区域内由管摩擦纺丝形成的部件。特别是通过应用基于模型的过程控制，以及对摩擦纺丝工具系统的建设性调整，以及相关的过程参数范围和过程策略范围的扩展，将为残余应力调整创造进一步的可能性。适应新出现的工艺参数的基于模型的过程控制也旨在使用高效的近过程3D-DIC钻孔方法。此外，摩擦纺丝过程中残余应力产生的理论和数值建模旨在取代经验建模，并将使该过程更有效地在线控制。最后，所制造的部件要证明在规定的载荷情况下疲劳强度或目标失效的改善。

The aim of the project is to expand the friction spinning process based on fundamental investigations concerning the manufacture of high-performance components for aviation and aerospace engineering with defined residual stress states. The locally adapted residual stress distributions generated in this way are to bring about an improvement in the quality and functionality of the parts, such as by allowing failure to be delayed or triggered in a defined manner, for example. The overall objective is therefore the adjustment of defined residual stress distributions over the entire and load-relevant area of the components to improve its quality and functionality. The research hypothesis being pursued is that residual stress distributions can be adjusted accurately, reproducibly and efficiently over the entire area of the components formed by friction-spinning of tubes, in particular by applying a model-based process control and that the constructive adaptation of the friction-spinning tool system and the associated expansion of the process parameter range and the spectrum of process strategies will create further possibilities for residual stress adjustments. The model-based process control adapted to the newly emerging process parameters is also intended to use the efficient and near-process 3D-DIC hole-drilling method. Furthermore, theoretical and numerical modelling of the residual stress generation in the friction spinning process is intended to replace the empirical modelling and will enable an even more efficient online control of the process. Finally, the manufactured components are to prove an improvement of the fatigue strength or the targeted failure under defined loading situations.