Scale-free features of temporal localization of deformation in late stages of creep failure
Mäkinen, Tero; Koivisto, Juha; Laurson, Lasse; Alava, Mikko J. (2020-09)
Mäkinen, Tero
Koivisto, Juha
Laurson, Lasse
Alava, Mikko J.
09 / 2020
093606
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-202011037777
https://urn.fi/URN:NBN:fi:tuni-202011037777
Kuvaus
Peer reviewed
Tiivistelmä
The last stage of material failure often shows a regime with power-law acceleration as the material lifetime is approached. We study this experimentally in tensile creep with paper samples using digital image correlation. The last, tertiary creep stage exhibits scale-free features in the sample response (strain rate) and its fluctuations. It is accompanied by an increasing localization of strain at the location of final failure. The main features are reproduced by a material model built on a viscoelastic fiber bundle model.
Kokoelmat
- TUNICRIS-julkaisut [18911]