CHS - Microstructure based failure modelling

Published: 19 December 2011

The research project aims to establish relations between microstructural phase content and morphology with deformation and fracture properties in high performance steels. Primary driving forces comes from the automotive industry, where new car body structures with tailored microstructure and mechanical properties are introduced. The goal is to establish modells and analysis tools for design of crash-loaded komponents and optimization of the manufacturing process.

Technological development of crash-loaded automotive structures are primarily driven by two issues: Increased crashworthiness and lowered emissions by reduced vehicle weight. In coming generation of body structures press-hardened material will be introduced to a larger extent. This manufacturing process can be controlled in such a way that desired distribution of mechanical properties, strength and ductility, is obtained in the component. New knowledge is required for the development of these components and new tools for fracture prediction in a crash situation is needed. In the research work, localisation and fracture behavior is studied experimentally with full-field measurements and numerically with constitutive models formulated for heterogeneous materials.  The goal is to establish models and methodology for fracture prediction in high-performance steel suited for the present application, which can be used in product development.

 

Doctoral student: Rickard Östlund

Supervisor: Mats Oldenburg

Associate supervisor: Hans-Åke Häggblad