Project Area C: Active Material Safety

Project area C encompasses subprojects that focus on the development of materials and procedures that concern increasing the damage tolerance levels of materials, as well as their sensitivity to the propagation of cracks. The failure of a material should be as predictable as possible. The occurrence of damage should not lead to the sudden breakdown of the component. This constrast materials research performed thus farm which mostly focused on individual, specific properties. This project area aims to pave new paths in materials research, and develop materials while taking the material failure behavior and failure mechanisms into consideration. This materials research aims to combine fields while employing multi-scale methods that are to be developed for the prediction of dammage and failure mechanisms. All the while, man is a factor that will be taken into consideration. 

Subproject C1: Thermally Stable High-Performance Concretes

  • Prof. Dr. Bernhard Middendorf
  • Dipl.-Ing. Stefan Otten, Dipl.-Wirtsch.-Ing. Siemon Piotrowski
  • Participating Subproject(s): B2, C2, C3

At present, there are no verified findings or models that deal with the alteration of mechanical properties and permanently relevant material properties of high-performance concretes (high strength (HPC) and ultra-high strength concrete (UHPC)) when the materials are subject to changing thermal stresses. High-performance concretes fail when their extremely dense microstructures are subject to high temperatures, i.e., in the case of a fire. Such high temperatures cause pressure from water vapor to increase extremely quickly within the material. >>more

Subproject C2: Evaluation of the Strength, Reliability, and Life Span of Materials Using Numeric Methods: Multi-Scale Damage Mechanics Approaches

  • Prof. Dr. Andreas Ricoeur
  • Zhibin Wang, M.Sc.
  • Participating Subproject(s): A4, B2, B3, B4, C1, C3

We are developing a calculation tool that will enable the development of a crack and further damage development to be predicted when a material is subject to thermomechanical stress. This tool is based on the concept of continuum damage mechanics. >>more

Subproject C3: Evaluation of the Strength, Reliability, and Life Span of Materials Using Numeric Methods: Fracture Mechanics Approaches

  • Prof. Dr. Andreas Ricoeur
  • Dipl.-Ing. Paul Judt
  • Participating Subproject(s): A3, A4, B2, B3, B4, C1, C2

Crack growth is conventionally examined using methods from the field of fracture mechanics. The crack is modeled by pairing internal surfaces together. In order to simulate the growth of a crack using a numeric discretization method, three subtasks must be carried out. >>more

Teilprojekt C4: Bauteilrandzonen – Zuverlässige MatSubproject C4: Peripheral Zones of Components – Sustaining Reliable Material Properties when Materials are Subject to Complex Streerialeigenschaften unter komplexen Beanspruchunge

  • Prof. Dr. Berthold Scholtes
  • Prof. Dr. Thomas Niendorf
  • Stephanie Saalfeld, M. Sc.
  • Participating Subproject(s): A1, A2, A4, B4,C2, C3

A series of methods were established in practice in the past with which peripheral zones of components or areas at risk for failure could be modified to have decent microstructures. Examples of this include mechanical surface treatments, such as shot blasting or compacting, or thermal treatments, such as curing of the marginal layer. These methods are the state-of-the-art, and make a substantial constribution to lightweight construction and resource efficiency. They enable the durability or life spans of components to be enhanced. >>more