![Sample our Engineering & Technology journals, sign in here to start your access, latest two full volumes FREE to you for 14 days]({"type":"image" , "src" : "/sda/5933/TOC-Subject-Sample-2021-Engineering-Tech.jpg"})
Abstract
An analysis of the effect of microcracks in porous metals on amplitude-dependent internal friction (ADIF) is carried out. A mathematical model is developed, which takes into account an initial distribution of microcracks lengths defining subsequent crack growth during cycling. Using the Dugdale model, the linear density of microplastic zones at the tips of the microcracks is obtained as a function of applied stress and porosity. Resulting simulations of internal friction are compared with corresponding experimental data.
Acknowledgements
The authors are grateful to Dr M. Bram (Forschung Zentrum Julich) for specimens and to Professor W. Riehemann (TU–Clausthal) for the opportunity to use the vibrating reed apparatus and fruitful discussions. Our special thanks go to Professor H.-R. Sinning (TU–Braunschweig) for critical reading of this manuscript.