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Prediction of formability of adhesive bonded steel sheets and experimental validation

Satheeshkumar V., Ganesh Narayanan R.

Archives of Civil and Mechanical Engineering

2015

Vol. 15, no. 1

30--41

The main aim of the present work is to predict the formability of adhesive bonded sheets and validate the same with experimental results at different adhesive properties. The tensile and in-plane plane-strain formability tests are carried out to predict the formability of adhesive bonded sheets. The forming limit strains are predicted using thickness gradient necking criterion (TGNC) and effective strain rate criterion (ESRC), and validated with the experimental limit strains. A simulation methodology has been analyzed thoroughly in the present work, and the prediction accuracies are compared and discussed. The results show that the adhesive bonded blanks show improved elongation and forming limit strains as compared to un-bonded base materials with increase in hardener/resin ratio of adhesive. The true stress–strain predictions are accurate as compared to experimental data. There is a moderate difference in adhesive bonded sheets limit strains between predictions and experiments. This may be due to the absence of interface bonding between adhesive and base materials during predictions. The necking criterion, TGNC, shows better prediction as compared to ESRC.

Nowa uproszczona metoda określania nośności ogniowej elementów żelbetowych

Janowski Z., Seręga S.

Inżynieria i Budownictwo

2008

R. 64, nr 4

181-185

Przedstawiono uproszczone metody wyznaczania odporności ogniowej konstrukcji żelbetowych oraz nowe podejście do wyznaczania tej odporności. Nowa metoda, tzw. zmodyfikowana metoda ruchomego punktu obrotu, jest oparta na analizie odkształceń granicznych. Wyniki otrzymane za pomocą nowej metody są w dobrej zgodności z wynikami otrzymanymi metodą przyrostowo-iteracyjną.

New simplified method for determining fire resistance of RC sections. The commonly used simplified methods as well as a new approach for determining fire resistance of reinforced concrete sections are presented. The new method, the so called modified moving pivot method, is based on the limit strain analysis. The results obtained from the modified moving pivot method are in a very good agreement with those obtained from more elaborated and more time consuming incremental-iterative approach.