Innovative Materials for Mechanical Engineering, Research on the Applicability of UHPC as an Machine Frame Material (Part 1 Identification of the Essential Mechanism of the Humid depending Characteristics)

近年来，人们越来越多地研究机器框架部件的替代材料，这些部件传统上是由钢或聚合物混凝土制成的。在建筑设计和开发中，环境和经济因素正变得越来越重要。因此，本课题对超高性能混凝土(UHPC)作为机架材料进行了全面的研究。超高性能混凝土是对传统混凝土的进一步发展。与常规混凝土相比，超高性能混凝土具有更高的强度参数、更致密的结构和显著改善的耐久性。在木材和复合材料加工机械中的个别应用领域已经受益于机器框架中的超高性能混凝土。它的目的是扩大金属加工机床的应用领域，即使使用冷却剂也是如此。到目前为止，只有少数几个施工指南，其中大部分来自聚合物混凝土。因此，对超高性能混凝土机架的计算进行基础性研究是本文的目的之一。这些计算结果将在不同的超高强度混凝土上进行验证，从而为机架部件的结构设计提供一个逼真的方案。另一个目标是优化混凝土设计在机械工程中的应用，以及不同湿度条件下弯曲拉伸强度的差异。需要进一步研究的是变形值、表面精度、与工艺流体接触后的化学耐久性以及收缩行为。该项目的第一部分仅限制了工作液对超高性能混凝土的影响。重点研究了超高性能混凝土与水的相互作用以及冷却、润滑剂等机床典型工作液之间的相互作用以及机械特性的等效变化。

In recent times, research has been increasingly conducted on alternate materials for machine frame components, traditionally made from steel or polymer concrete. Environmental as well as economic aspects are becoming more important in construction design and -development. Hence, this research project is focused on an overall investigation of ultra-high performance concrete (UHPC) as machine frame material. UHPC is a further development of traditionally concrete. UHPC, compared to conventional concrete, has significant higher strength parameters, a more dense structure and a substantial improved durability. Isolated fields of application in machines for wood and composites machining already benefit from UHPC in machine frames. It is intended to expand the field of application to machine tools for metal machining, even if coolants are used.To the time, there are only a few construction guidelines and the most of them come from polymer concrete. Hence, an aim is to make basic research on calculating UHPC machine frames. The calculations will be verified on different UHPC to afford a realistic structural design of machine frame components. An additional aim is the optimization of concrete design with respect to application in mechanical engineering and also the differences in bending tensile strength under different moisture conditions. Further values to investigate are the deformation values, surface accuracy, the chemical durability after contact with process fluids and also the shrinkage behavior.The first part of the project restrict only the aspect of the influence of operating fluids to UHPC. The focus lies in the interaction between UHPC with water and other for machine tools typical operating fluids like cooling lubricants and the equivalent changing of the mechanical characteristics.