Proceedings of the 3rd Polish Congress of Mechanics (PCM) and 21st International Conference on Computer Methods in Mechanics (CMM), Gdansk, Poland, 8-11 September 2015 - Krzysztof Wilde; Michal Kleiber; Tadeusz Burczynski; Jaroslaw Gorski; Lukasz Smakosz; Karol Winkelmann (Taylor and Francis, 2016)