KEYNOTE SPEAKERS
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Full name of the keynote speaker

Wolfgang Peter Bleck

Company

IRCA Global Brasil Ltda.

Department

Institute of Ferrous Metallurgy

Summary keynote speaker resume

Born 8 May 1951; physical metallurgy at Clausthal University , 1979 Dr.-Ing. degree, 1980 – 1993 ThyssenKrupp Stahl AG in Duisburg/Germany, head of the department of process and steel develop­ment of flat rolled products; since 1994 professor of ferrous metallurgy at RWTH Aachen University; since 2002 deputy vice-rector for structure, research and human ressources of RWTH.

Title of the lecture

Dynamic tensile testing of modern car body steels

Summary of the spoken topic

Crash behaviour and light weight have become the major design criteria for car bodies. Modern high strength steels offer appropriate solutions for these demands.

The prediction of the crash behaviour in simulation programs requires the information on materials behaviour during dynamic testing. The reduction of the signal waviness and the inertia effects at strain rates above 50s -1 are major issues in dynamic tensile tests. Different techniques for load and strain measurement are compared and evaluated with regard to accuracy and testing effort. Advantages and drawbacks of those various measurement techniques are presented and recommendations for different test purposes are provided.

Various modern steels for car body applications have been intensively investigated by high strain rate tensile tests with strain rates between 0.005s -1 and 650 s -1 at temperatures between -40°C and 100°C . Significant differences in the materials behaviour could be detected between mild steels, rephosphorized steels, dual phase steels and TRIP steels with regard to their strain rate and temperature sensitivity. Some explanations based on microstructural features are discussed.
 
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