Development of a macromechanical model for determination of the corrosion susceptibility of formed parts

所提交项目的目的是确定一个新的宏观力学模型在有限元中实现。该模型实现了腐蚀成本最小化的有效途径。根据目前的技术水平，对腐蚀的敏感性，特别是钢，很大程度上受到近表面残余应力的影响。通过对成形过程模拟引起的残余应力行为和材料特有的腐蚀行为的了解，建立了一个定义腐蚀系统的模型。使用该模型，可以在组件制造之前对定义系统内的腐蚀敏感性进行数值估计。这种情况是与残余应力和由此产生的腐蚀行为有关的成形过程的发展和适应的基础。因此，在新产品的早期开发阶段降低成本是可能的，并且在确定的应用条件下，可以在数值过程优化的支持下生产耐腐蚀的最终产品。材料、影响腐蚀的环境（例如腐蚀性和物理性质）以及随时间变化的损伤过程必须被视为腐蚀系统的基本特征。因此，在海上领域的应用注定是明确的、以实践为导向的腐蚀系统。

The objective of the submitted project is to ascertain a new macro-mechanical model implemented in the FEM. This model realizes an effective approach for the minimization of costs caused by corrosion. As arises from the state of the art, the susceptibility to corrosion, particularly of steel, is considerably influenced by the nearsurface residual stresses. With the knowledge of the residual stress behavior induced by the forming process simulation and the material-specific corrosion behavior, a model for a defined corrosion system is to be developed. Using this model the susceptibility to corrosion within a defined system can be numerically estimated before the fabrication of the components. This circumstance is the basis for the development and adaption of the forming process in relation to the residual stress and resulting corrosion behavior. Thereby, a reduction of costs in the early development phase of a new product is possible and, for defined application conditions, corrosion-resistant end products can be produced with the support of numeric process optimization. The material, the environment influencing the corrosion, for example the corrosive and the physical properties, and the time-dependent damage progress have to be considered as essential characteristics of the corrosion system. Therefore, applications in the offshore sector are predestined as defined and practice-orientated corrosion systems.