heterogeneous materials

The design, analysis, and control of bio-systems remain an engineering challenge. This is mainly due to the material heterogeneity, boundary irregularity, and nonlinear dynamics associated with these systems. The recent developments in imaging techniques and stochastic upscaling methods provides a window of opportunity to more accurately assess these bio-systems than ever before. However, the use of image data directly in upscaled stochastic framework can only be realized by the development of certain intermediate steps. The goal of the research presented ...

Powder Metallurgy (PM) is an economical way to produce components in large series. To broaden the range of components that can be successfully produced in PM steel, improved design criteria are needed. Notched fatigue is one domain where the present knowledge is insufficient for the design of highly stressed components. This work is an investigation of the notched fatigue performance of five PM steels from Höganäs AB. Four point bending fatigue tests (R=-1 and 0) of notched and un-notched specimens were ...