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Piotr Perzyna : Scientific Conductor within Theory of Thermo-Viscoplasticity

Glema A., Łodygowski T., Sumelka W.

Engineering Transactions

2014

Vol. 62, iss. 3

193–-219

In this paper, authors reminisce on years of scientific cooperation and achievements on the personality of Piotr Perzyna and his Theory of Thermo-Viscoplasticity, which are displayed from remembrance. All the essence of latin words Master, Doctor, Docent, Professor are in some kind the reflection of the scientific history that has happened during the last 40 years. For every author the shift of 10 to 20 years shows that Piotr Perzyna served with his personality and knowledge for two to three different generations, working with authors as 20/30/50 years younger man. Now, one year after Piotr Perzyna passed away in 2013 (50 years after publishing the basic paper on Theory of Thermo-Viscoplasticity in 1963), the role he has played for authors has become much clearer and conspicuous as well as in a wider context. Like P iotr = P eter = P etrus = Kηϕας ´ Professor Perzyna is the rock on which we build. Let it remain not only in memory.

Damage induced by viscoplastic waves interaction

Łodygowski T., Sumelka W.

Vibrations in Physical Systems

2012

Vol. 25

23--32

Viscoplastic waves interaction plays a fundamental role in a strain localisation phenomenon especially during highly dynamic processes occurring for example during car or orbiting space objects crashes (strain rates locally reach the values of order 107 s-1 In zones of localised deformation an intensive evolution of damage occurs which is undoubtedly directional (anisotropic) and finally may cause failure (loss of continuity). Such processes are highly influenced by the temperature (reaching often melting points) and mostly under adiabatic conditions. Mathematical description of the mentioned phenomena formulated in terms of Perzyna's thermoviscoplasticity is considered in this paper.