Critical phenomena in creep and damage

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Alava, Mikko J., Prof. Rosti, Jari 2012-08-28T11:55:25Z 2012-08-28T11:55:25Z 2010
dc.identifier.isbn 978-952-60-3459-1 (electronic)
dc.identifier.isbn 978-952-60-3458-4 (printed) #8195;
dc.identifier.issn 1795-4584
dc.description.abstract The deformation and the damage evolution are studied in creep and fracture experiments using paper samples. Experimental methods utilized are the digital image correlation and the acoustic emission. Statistical models of the deformation and fracture are tested. In the tensile geometry, the Andrade creep phase characterized by a power law decay of the strain rate, and the increase of the relative strength of strain rate fluctuations. The integrated deformation follows a data collapse appropriate for an absorbing state phase transition. The fluctuation scaling is confirmed to exist in the logarithmic primary creep regime, but not in the creep recovery. In the peel-in-nip geometry, under a constant force, advancing front exhibits creep-depinning phase transition. Numerical models suggest that it corresponds the motion of an elastic line with a long-range elastic interaction. The probability distributions of the event energies, waiting times between events and the correlated dynamics of the intermittent crackling noise are studied in the fracture phenomena, in various different loading modes and loading geometries. Analogies to the tectonic seismicity is discussed. The concept of criticality is studied in the tensile experiment and a strain imposed loading. The idea of criticality implies the presence of a divergences in the acoustic emission time series. The event rate is found to diverge, when a sample-dependent "critical time" of the maximum event rate is approached. This takes place after the maximum stress is reached. The results are compared with statistical fracture models of heterogenous materials. en
dc.format.extent Verkkokirja (2332 KB, 56 s.)
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Aalto-yliopiston teknillinen korkeakoulu en
dc.relation.ispartofseries TKK dissertations, 254 en
dc.relation.haspart [Publication 1]: Jari Rosti, Juha Koivisto, Lasse Laurson, and Mikko J. Alava. 2010. Fluctuations and scaling in creep deformation. Physical Review Letters, volume 105, number 10, 100601, 4 pages. en
dc.relation.haspart [Publication 2]: Mika Mustalahti, Jari Rosti, Juha Koivisto, and Mikko J. Alava. 2010. Relaxation of creep strain in paper. Journal of Statistical Mechanics: Theory and Experiment, volume 2010, number 07, P07019, 19 pages. en
dc.relation.haspart [Publication 3]: J. Rosti, J. Koivisto, and M. J. Alava. 2010. Statistics of acoustic emission in paper fracture: precursors and criticality. Journal of Statistical Mechanics: Theory and Experiment, volume 2010, number 02, P02016, 18 pages. en
dc.relation.haspart [Publication 4]: L. I. Salminen, J. M. Pulakka, J. Rosti, M. J. Alava, and K. J. Niskanen. 2006. Crackling noise in paper peeling. Europhysics Letters, volume 73, number 1, pages 55-61. en
dc.relation.haspart [Publication 5]: J. Koivisto, J. Rosti, and M. J. Alava. 2007. Creep of a fracture line in paper peeling. Physical Review Letters, volume 99, number 14, 145504, 4 pages. en
dc.relation.haspart [Publication 6]: Jari Rosti, Juha Koivisto, Paola Traversa, Xavier Illa, Jean-Robert Grasso, and Mikko J. Alava. 2008. Line creep in paper peeling. International Journal of Fracture, volume 151, number 2, pages 281-297. en
dc.subject.other Paper technology
dc.subject.other Physics
dc.subject.other Materials science
dc.title Critical phenomena in creep and damage en
dc.type G5 Artikkeliväitöskirja fi Aalto-yliopiston teknillinen korkeakoulu fi
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword plasticity en
dc.subject.keyword viscoelasticity en
dc.subject.keyword creep en
dc.subject.keyword disordered soils en
dc.identifier.urn URN:ISBN:978-952-60-3459-1
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.supervisor Alava, Mikko J., Prof.

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